Variable Time Delay Modulation Patents (Class 380/35)
  • Patent number: 10122538
    Abstract: An antifuse physically unclonable function (PUF) unit includes a first sub-antifuse cell, a second sub-antifuse cell, a connection circuit, a first copying circuit and a first reading circuit. The first sub-antifuse cell includes a first antifuse transistor. The second sub-antifuse cell includes a second antifuse transistor. The connection circuit is connected between a source/drain terminal of the first antifuse transistor and a source/drain terminal of the second antifuse transistor. The first copying circuit is connected with the first sub-antifuse cell, and includes a third antifuse transistor. The first reading circuit is connected with the first copying circuit. Moreover, the first reading circuit generates a random code according to a state of the third antifuse transistor.
    Type: Grant
    Filed: October 6, 2017
    Date of Patent: November 6, 2018
    Assignee: EMEMORY TECHNOLOGY INC.
    Inventors: Meng-Yi Wu, Hsin-Ming Chen
  • Patent number: 10074902
    Abstract: An improved active, electronically scanned array antenna that employs programmable time delays in the transmission feed lines to form timed arrays is provided. A timed array can be implemented as a nested set of transmission lines, and the programmable time delay can be realized as or in each of the transmission lines such that each transmission line can have a fixed physical length and a programmable electrical length.
    Type: Grant
    Filed: April 26, 2016
    Date of Patent: September 11, 2018
    Assignee: TEQNOVATIONS, LLC
    Inventor: Thomas Edward Linnenbrink
  • Patent number: 10044500
    Abstract: Storage infrastructures and methods that generate hash values based on error correction codes. A system is provided that includes: a code retrieval system implemented on a host having logic for issuing a redundancy read command to a storage system to retrieve a redundancy code for an identified data block; and a hashing system implemented on the host for hashing the redundancy code to generate a hash value based on the redundancy code. A storage system is also provided that includes: a memory for storing data blocks and associated redundancy codes; and a controller having: an input/output for receiving a hash value read command for a specified data block from a host and returning a hash value; a decoding system that extracts a redundancy code associated with the specified data block; and an in-memory hashing system for computing a hash operation on the redundancy code.
    Type: Grant
    Filed: May 13, 2016
    Date of Patent: August 7, 2018
    Assignee: SCALEFLUX, INC.
    Inventors: Hao Zhong, Fei Sun, Yang Liu
  • Patent number: 9825766
    Abstract: A system and method for authenticating and enabling functioning of a manufactured electronic device are disclosed.
    Type: Grant
    Filed: February 6, 2017
    Date of Patent: November 21, 2017
    Assignee: ANVAYA SOLUTIONS, INC.
    Inventors: Sathyamurthi Sadhasivan, Shobha Rani Mallarapu, Srinivas Atluri
  • Patent number: 9350074
    Abstract: An improved active, electronically scanned array antenna that employs programmable time delays in the transmission feed lines to form timed arrays is provided. A timed array can be implemented as a nested set of transmission lines, and the programmable time delay can be realized as or in each of the transmission lines such that each transmission line can have a fixed physical length and a programmable electrical length.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: May 24, 2016
    Assignee: TEQNOVATIONS, LLC
    Inventor: Thomas Edward Linnenbrink
  • Patent number: 8976959
    Abstract: Communicating data is disclosed. A time delay encoding a data to be communicated is selected. A sonic signal is combined with a version of the sonic signal that is delayed by the selected time delay. The data is communicated at least in part by transmitting the combined signal to a mobile device.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: March 10, 2015
    Assignee: Clinkle Corporation
    Inventors: Lucas Andrew Duplan, Jason N. Riggs
  • Patent number: 8848905
    Abstract: Deterrence of device subversion by substitution may be achieved by including a cryptographic fingerprint unit within a computing device for authenticating a hardware platform of the computing device. The cryptographic fingerprint unit includes a physically unclonable function (“PUF”) circuit disposed in or on the hardware platform. The PUF circuit is used to generate a PUF value. A key generator is coupled to generate a private key and a public key based on the PUF value while a decryptor is coupled to receive an authentication challenge posed to the computing device and encrypted with the public key and coupled to output a response to the authentication challenge decrypted with the private key.
    Type: Grant
    Filed: July 28, 2010
    Date of Patent: September 30, 2014
    Assignee: Sandia Corporation
    Inventors: Jason R. Hamlet, Todd M. Bauer, Lyndon G. Pierson
  • Publication number: 20140140503
    Abstract: Communicating data is disclosed. A time delay encoding a data to be communicated is selected. A sonic signal is combined with a version of the sonic signal that is delayed by the selected time delay. The data is communicated at least in part by transmitting the combined signal to a mobile device.
    Type: Application
    Filed: March 15, 2013
    Publication date: May 22, 2014
    Inventor: Clinkle Corporation
  • Patent number: 8564402
    Abstract: A lock system that unlocks a lock with an unlock signal, prevents malfunction of locking or unlocking, and reduces power consumption of a receiving unit side that receives the unlock signal. The lock system avoids radio wave interference of the unlock signal and prevents malfunction of locking or unlocking by providing irregularity in a transmission timing of the unlock signal to a device that unlocks a lock with the unlock signal. In regard to a reception of the unlock signal, the lock system sets a receiving window by setting a reception-ON time and a reception-OFF time, and by stopping an operation of the receiving unit except during the reception-ON time, reduction of power consumption can be achieved.
    Type: Grant
    Filed: February 26, 2007
    Date of Patent: October 22, 2013
    Assignee: Fujitsu Limited
    Inventor: Makoto Saotome
  • Patent number: 8553879
    Abstract: Provided is a content transmission device 310 that can reduce failure of content key confirmation processing during special playback such as fast-forwarding and fast-rewinding. A key management unit 312 generates or updates a key parameter, and stores therein the generated or updated key parameter. The key management unit 312 receives a key parameter from the content reception device 340, and calculates a difference between the key parameter stored therein and the received key parameter. By using the calculated difference, a transmission control unit 313 judges whether or not to change a transmission speed at which an encrypted content portion is to be transmitted, and depending on a result of the judgment, selects one of transmission speeds and transmits the encrypted content portion in accordance with the selected transmission speed.
    Type: Grant
    Filed: May 10, 2010
    Date of Patent: October 8, 2013
    Assignee: Panasonic Corporation
    Inventors: Kazuhiro Nomura, Katsuhisa Yamaguchi
  • Patent number: 8462951
    Abstract: Systems and methods for generating OFDM signals are provided in which sub-carrier usage is selected and/or remapped in various manners. For example, in some embodiments remapping using a security sequence is employed; in other embodiments, decoy sub-carriers are employed; in other embodiments, mask sub-carriers are used to cover jammed portions of a channel.
    Type: Grant
    Filed: January 16, 2008
    Date of Patent: June 11, 2013
    Assignee: Apple Inc.
    Inventors: David Steer, Marcus Leech
  • Patent number: 8411632
    Abstract: A method, apparatus, and computer program for protecting transmissions are provided. A wireless communication apparatus receives a physical layer convergence protocol header of a transmission on a frequency band and determines from header information included in the header, whether or not there are further transmissions associated with the transmission and after the transmission on the frequency band. In response to determining on the basis of the header information that there will be at least one other transmission after the transmission on the frequency band, channel access of the wireless communication apparatus is suspended on the frequency band for a determined time period after the transmission, the determined time period including a transmission time interval of the at least one other transmission.
    Type: Grant
    Filed: November 4, 2010
    Date of Patent: April 2, 2013
    Assignee: Nokia Corporation
    Inventors: Jarkko Kneckt, Mika Kasslin
  • Patent number: 8335314
    Abstract: A method and system to increase the security of messages transmitted over an otherwise unsecured network. A secure channel is established in a normal manner over the network. A demodularization module on the sender sends a demodularization method to the intended receiver over the secure channel. The sender encodes a message definition and message data separately consistent with the demodularization method. The message definition and message key is sent over the secure channel as one transmission and the message data with the message key is sent as separate transmissions over the secure channel. Other embodiments are also described and claimed.
    Type: Grant
    Filed: July 27, 2010
    Date of Patent: December 18, 2012
    Assignee: SAP Aktiengesellschaft
    Inventor: Robert Heidasch
  • Patent number: 8300813
    Abstract: Secure communication of information is effected from a first party to a second party when the first party knows its own global location and the global location of the second party, and employs what essentially is an undiscoverable code signal that is broadcast to, and received by, both the first and the second parties. The first party securely communicates information to the second party by modifying the code signal with the information that is to be communicated and sends the modified code signal to the second party. Illustratively, the code signal is related to the Y component of a GPS signal.
    Type: Grant
    Filed: August 29, 2008
    Date of Patent: October 30, 2012
    Assignee: The Boeing Company
    Inventors: David S DeLorenzo, Per K Enge, Sherman C. Lo
  • Patent number: 8275997
    Abstract: A method of encrypting and transmitting data and a system for transmitting encrypted data. The method includes one or more different encryption algorithms, and may include employing different encryption algorithms to achieve multiple levels of encryption. A first encryption algorithm is based upon multiple rearrangements of bits representing data to obtain encoded data. A second encryption algorithm is based upon performing multiple XOR operations on bits representing data so that each data word is at least encoded with previous data words. The system comprises first and second computers and a plurality of communication parameters. The two computers are communicably connected to a network, and the second computer is adapted to route a transmission to the first computer. The transmission includes a data part and a header part, both of which are encrypted by the second computer utilizing the communication parameters. The first computer decrypts the transmission utilizing the communication parameters.
    Type: Grant
    Filed: July 1, 2010
    Date of Patent: September 25, 2012
    Assignee: Encryption Solutions, Inc.
    Inventors: Robert Allen Stedron, John L. Chmielewski
  • Patent number: 8195954
    Abstract: A memory controller for a smart card including a non-volatile memory can include an internal circuit that is configured to perform cryptographic key processing responsive to a first clock and a non-volatile memory interface circuit for transferring/receiving a signal to/from the internal circuit in synchronization with the first clock and transferring/receiving the signal to/from an external device in synchronization with a second clock that is asynchronous relative to the first clock.
    Type: Grant
    Filed: June 27, 2007
    Date of Patent: June 5, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Keon-Han Sohn
  • Patent number: 8160253
    Abstract: A method for wireless data transmission between a base station and a transponder is provided, whereby a message, comprising at least one command and one data sequence, is transmitted by the base station, the message is received and evaluated by the transponder, at least one key is provided in the transponder after receipt of the command and before complete receipt of the message and the key is transmitted to the base station, the key is detected by the base station, and parts of the message, still to be transmitted, and/or subsequent messages are encoded by the base station with the key.
    Type: Grant
    Filed: June 25, 2007
    Date of Patent: April 17, 2012
    Assignee: Atmel Corporation
    Inventors: Martin Fischer, Ulrich Friedrich, Jens Masuch, Michael Pangels, Dirk Ziebertz
  • Publication number: 20120027202
    Abstract: A method and system to increase the security of messages transmitted over an otherwise unsecured network. A secure channel is established in a normal manner over the network. A demodularization module on the sender sends a demodularization method to the intended receiver over the secure channel. The sender encodes a message definition and message data separately consistent with the demodularization method. The message definition and message key is sent over the secure channel as one transmission and the message data with the message key is sent as separate transmissions over the secure channel. Other embodiments are also described and claimed.
    Type: Application
    Filed: July 27, 2010
    Publication date: February 2, 2012
    Applicant: SAP AG
    Inventor: Robert Heidasch
  • Publication number: 20120002812
    Abstract: Secure communication of data between devices includes encrypting unencrypted data at a first device by reordering unencrypted bits provided in parallel on a device bus, including data and control bits, from an unencrypted order to form encrypted data including a plurality of encrypted bits in parallel in an encrypted order defined by a key. The encrypted data may be transmitted to another device where the encrypted data is decrypted by using the key to order the encrypted bits to restore the unencrypted order thereby to reform the unencrypted data.
    Type: Application
    Filed: June 30, 2010
    Publication date: January 5, 2012
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Robert H. Bell, JR., Louis B. Capps, JR., Michael J. Shapiro
  • Patent number: 8036383
    Abstract: Provided are a method and apparatus for secure communication between cryptographic systems using a Real Time Clock (RTC). The method and apparatus allow a transmitting cryptographic system to transfer partial RTC data and a receiving cryptographic system to restore entire RTC data, thereby minimizing data to be transferred between the cryptographic systems. The method includes: calculating a largest RTC deviation between a transmitting cryptographic system and a receiving cryptographic system; calculating the smallest number of bits of partial data on an RTC required for restoring entire data on the RTC on the basis of the calculated largest RTC deviation; calculating the partial RTC data on the basis of the calculated smallest number of bits of the partial RTC data; and transferring the calculated partial RTC data to the receiving cryptographic system.
    Type: Grant
    Filed: April 15, 2008
    Date of Patent: October 11, 2011
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jae Heon Kim, Jae Woo Han, Dong Chan Kim, Sang Woo Park
  • Patent number: 7949133
    Abstract: Systems and methods are disclosed for enabling encryptor devices to provide real-time messages having offset cryptoperiods according to an offset algorithm within common crypto-sync pulse boundaries. A master clock aligns the encryptor devices to a common crypto-sync pulse. Subsequently, a cryptoperiod offset aligner assigns a different offset value according to an algorithm to each encrypted service. The corresponding encryptor device then begins the cryptoperiod, during which real-time messages are transmitted, at the assigned offset value from the common crypto-sync pulse.
    Type: Grant
    Filed: September 26, 2007
    Date of Patent: May 24, 2011
    Inventor: Howard G. Pinder
  • Patent number: 7933408
    Abstract: The claimed subject matter provides a system and/or method that asynchronously disseminates multimedia content to disparate clients. The disclosed system can include a component that receives multimedia content supplied by a multimedia publisher, encrypts or applies a time sensitive lock to the received multimedia content, disseminates the encrypted or locked multimedia content to the disparate clients, and a time subsequent, generates and distributes to the disparate clients a counterpart to the time sensitive lock necessary to unlock and play the disseminated and encrypted or locked multimedia content on the clients.
    Type: Grant
    Filed: June 15, 2007
    Date of Patent: April 26, 2011
    Assignee: Microsoft Corporation
    Inventors: Curtis G. Wong, Dale A. Sather, Kenneth Reneris, Thaddeus C. Pritchett, Talal Ali Batrouny
  • Patent number: 7801297
    Abstract: A communication device comprises a receiver configured to receive a notification of a cipher parameter used for encryption of data and a requested start time at which the encryption starts; and a correction unit configured to determine whether the cipher parameter needs to be corrected in response to the notification having been retransmitted based on the requested start time and an actual start time at which the encryption actually starts, and correct the cipher parameter.
    Type: Grant
    Filed: November 15, 2004
    Date of Patent: September 21, 2010
    Assignee: NTT DoCoMo, Inc.
    Inventors: Takehiro Ida, Mitsuo Iwanaga, Yasushi Sakamoto
  • Patent number: 7752453
    Abstract: A method of encrypting and transmitting data and a system for transmitting encrypted data. The method includes one or more different encryption algorithms, and may include employing different encryption algorithms to achieve multiple levels of encryption. A first encryption algorithm is based upon multiple rearrangements of bits representing data to obtain encoded data. A second encryption algorithm is based upon performing multiple XOR operations on bits representing data so that each data word is at least encoded with previous data words. The system comprises first and second computers and a plurality of communication parameters. The two computers are communicably connected to a network, and the second computer is adapted to route a transmission to the first computer. The transmission includes a data part and a header part, both of which are encrypted by the second computer utilizing the communication parameters. The first computer decrypts the transmission utilizing the communication parameters.
    Type: Grant
    Filed: January 8, 2004
    Date of Patent: July 6, 2010
    Assignee: Encryption Solutions, Inc.
    Inventors: Robert Allen Stedron, John L. Chmielewski
  • Patent number: 7672453
    Abstract: A communication system includes an encryptor and a decryptor. For improved encryption security, the encryptor includes a multitap delay line to produce mutually delayed samples of the signal to be encrypted. Each sample is operated on by a key or function to produce modified signal samples, and the modified signal samples are summed or combined to produce the encrypted signal. According to one aspect of the invention, at least one of the keys or functions includes a nonlinear function. In some embodiments, the functions are time-variant for improved security. Decryption is accomplished in some embodiments by an equalizer. The preferred equalizer is the maximum-likelihood-sequence estimators matched to the encryption functions. A Viterbi algorithm makes it easy to implement the matched equalizer.
    Type: Grant
    Filed: August 21, 2000
    Date of Patent: March 2, 2010
    Assignee: Lockheed Martin Corporation
    Inventor: David William Matolak
  • Patent number: 7665667
    Abstract: Updating the access control of a smart card at multiple points of the smart card life cycle. The system and method for updating the access control mechanisms during the smart card life cycle includes implementing an interface having a method for providing access control and a method for registering an access manager as an active access manager. In response to a request to register an access manager, the system and method executes the method for determining whether registering the access manager may be allowed.
    Type: Grant
    Filed: September 30, 2005
    Date of Patent: February 23, 2010
    Assignee: Gemalto Inc.
    Inventors: Sylvain Prevost, Kapil Sachdeva
  • Patent number: 7630492
    Abstract: A process for distributing digital audio sequences according to a nominal flux format including a succession of fields, each of which includes at least one digital block clusterizing a selected number of coefficients corresponding to single audio elements that are digitally coded inside the flux and utilized by audio decoders that are able to play it to be able to decode it correctly, including a preparatory step including modifying at least one of the coefficients, and a transmission step including a primary flux in compliance with a nominal format including blocks that were modified during the preparatory step and by a route separated from the primary flux by an additional piece of digital information which allows reconstruction of the original flux starting with a calculation, on recipient equipment, as a function of the primary flux and of the additional information.
    Type: Grant
    Filed: March 29, 2005
    Date of Patent: December 8, 2009
    Inventors: Daniel Lecomte, Daniela Parayre-Mitzova
  • Patent number: 7613298
    Abstract: A process for distributing digital video sequences in accordance with a nominal stream format including a succession of frames, each frame including at least one digital block regrouping a plurality of coefficients corresponding to simple, digitally coded visual elements is disclosed.
    Type: Grant
    Filed: March 28, 2005
    Date of Patent: November 3, 2009
    Assignee: Medialive
    Inventors: Daniel LeComte, Pierre Sarda, Daniela Parayre-Mitzova, Sébastien Georges
  • Publication number: 20080205640
    Abstract: A system and a method for flexible, yet secure distribution of digital content items, optionally with an automatic payment mechanism for purchasing such content. The present invention supports the distribution of content to end user devices from a central distribution point, as in client-server models and variations thereof, and/or peer-to-peer distribution, for example between end user devices. In addition, the present invention also supports distribution models within either of these mechanisms for unitary distribution, to a specified end user device, or broadcast/multicast distribution, to a plurality of end user devices. In any case, in order for the distributed content to be operative, for example to be “played back” or otherwise displayed, the recipient end user device must be in communication with a network control center.
    Type: Application
    Filed: April 30, 2008
    Publication date: August 28, 2008
    Inventors: Chaim D. Shen-Orr, Eli Hibshoosh, Steve Epstein, Stephanie Wald, Yaakov Belenky, Yigal Shapiro
  • Patent number: 7352861
    Abstract: This invention relates to a digital electronic component which is protected against electrical- and/or electromagnetic-type analyse). The inventive component comprises: a synchronous element (10) which is controlled by a clock (H); means (11, 12) of generating said clock (H), the frequency of which varies randomly between a minimum value and a maximum value for at least a given period of time; and means (13) of controlling the random nature of the frequency change of said clock (H).
    Type: Grant
    Filed: December 11, 2002
    Date of Patent: April 1, 2008
    Assignee: Nagra Thomson Licensing
    Inventors: Jean-Luc Dauvois, Jérôme Perrine
  • Patent number: 7321660
    Abstract: A computer system comprises a first computer entity arranged to encrypt data using an encryption key comprising a time value, and a second computer entity arranged to generate, at intervals, a decryption key using a current time value. The encryption and decryption processes are such that the decryption key generated using a current time value corresponding to that used for the encryption key, is apt to decrypt the encrypted s data.
    Type: Grant
    Filed: March 3, 2003
    Date of Patent: January 22, 2008
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Marco Casassa Mont, Keith Alexander Harrison, Martin Sadler
  • Patent number: 7319712
    Abstract: An orthogonal code generation apparatus can generate a sequence of orthogonal codes without having to prestore orthogonal code sequences in a memory, by applying logic operation on a sequence number and a location number using AND circuits A0, A1, A2, A3, . . . , An and an adder circuit. A scrambling code generation apparatus computes only the values of registers involved with a feedback operation and a spreading operation, and loads respective values into the registers while shifting the shift register. When all the registers store valid values, scrambling codes are generated by a shift operation of the shift register.
    Type: Grant
    Filed: July 2, 2001
    Date of Patent: January 15, 2008
    Assignee: Sanyo Electric Co., Ltd.
    Inventor: Katsuaki Hamamoto
  • Patent number: 7231044
    Abstract: An invention for digital authentication is provided. A first timing signal is received from a remote source using a receiver. Next, a delay number is stored. The delay number is based on a first delay time period between when the first timing signal was transmitted and when the first timing signal was received. A digital transaction is then authenticated using the delay number. In one aspect, a digital certificate is created using the delay number. The remote source can be any source capable of generating timing signals, such as a global positioning satellite (GPS) system or a cell tower system. The delay in the timing signal can be caused by free electrons in a line of sight between the remote source and the receiver, such as by variations in atmospheric conditions or by an object within the line of sight such as bird or tree branch. Optionally, the delay number can be stored on a User Card and a System Card.
    Type: Grant
    Filed: September 7, 2001
    Date of Patent: June 12, 2007
    Assignee: Digital Authentication Technologies, Inc.
    Inventor: Roger R. Dube
  • Patent number: 7218738
    Abstract: A selective encryption encoder has a packet identifier that identifies packets of a specified packet type forming a part of a program. A packet duplicator duplicates the identified packets to produce first and second sets of the identified packets. A PMT (program map table) inserter generates temporary identifying information that identifies the first and second sets of identified packets inserts the temporary identifying information as user private data in a program map table (PMT) forming a part of the transport program specific information (PSI). The data are then sent to and received from a primary encryption encoder to encrypt the first set of identified packets under a first encryption method. A secondary encrypter encrypts the second set of identified packets under a second encryption method. The PSI is then modified at a PSI modifier to remove the temporary identifying information and to correctly associate the first and second sets of identified packets and the unencrypted packets with the program.
    Type: Grant
    Filed: October 18, 2002
    Date of Patent: May 15, 2007
    Assignees: Sony Corporation, Sony Electronics Inc.
    Inventors: Leo M. Pedlow, Jr., Brant L. Candelore, Henry Derovanessian
  • Patent number: 7219082
    Abstract: A financial transaction network includes a customer network serviced by a host processor. The financial transaction network provides customers with a plurality of diverse and interchangeable financial products and financial services that customers may utilize to directly manage their financial assets. The host processor acts as a communications switch validating incoming transaction requests and routing them to specialized subsystems. The host processor maintains central records that can be accessed by network participants. The financial transaction network enables customers to continually interchange account values relating to any financial product, or financial service within the network. With its accessibility, speed and finality of settlement, the network permits these interchanges to be accomplished with maximum efficiency.
    Type: Grant
    Filed: September 19, 2005
    Date of Patent: May 15, 2007
    Inventor: Patrick Forte
  • Patent number: 7177426
    Abstract: An invention for electronic file protection using location and other entropy factors is provided. Environment information regarding a computer is obtained, wherein the environment information includes data concerning an operating environment of the computer. Based on the environment information, an encryption key is generated and an electronic file is encrypted using the encryption key. A decryption key can also be created based on environment information, wherein the decryption key can be utilized to decrypt the electronic file. In addition, the environment information can include location information of the computer, drive information regarding a drive wherein the electronic file will be stored, and time information specifying access duration.
    Type: Grant
    Filed: October 30, 2001
    Date of Patent: February 13, 2007
    Assignee: Digital Authentication Technologies, Inc.
    Inventor: Roger R. Dube
  • Patent number: 7076064
    Abstract: A method and arrangement for maintaining end-to-end synchronization on a telecommunications connection on which data are transmitted in frames substantially in real time and using synchronized end-to-end encryption which is synchronized by occasionally transmitting synchronization vectors in the frames, at least part of the telecommunications connection being a packet-switched connection, whereby the reproduction delay of the data to be transmitted can be increased by adding one or more extra frames to the frame sequence to be transferred and reduced by removing one or more frames from the frame sequence to be transferred, the arrangement including reproduction delay adjustment mechanisms arranged to change the reproduction delay during the data transmission at such a moment that the frame to be transferred next includes a synchronization vector.
    Type: Grant
    Filed: November 19, 2001
    Date of Patent: July 11, 2006
    Assignee: Nokia Corporation
    Inventors: Rasmus Relander, Timo Stenberg
  • Patent number: 6970843
    Abstract: A financial transaction network includes a customer network serviced by a host processor. The financial transaction network provides customers with a plurality of diverse and interchangeable financial products and financial services that customers may utilize to directly manage their financial assets. The host processor acts as a communications switch validating incoming transaction requests and routing them to specialized subsystems. The host processor maintains central records that can be accessed by network participants. The financial transaction network enables customers to continually interchange account values relating to any financial product, or financial service within the network. With its accessibility, speed and finality of settlement, the network permits these interchanges to be accomplished with maximum efficiency.
    Type: Grant
    Filed: August 24, 2000
    Date of Patent: November 29, 2005
    Inventor: Patrick A. Forte
  • Patent number: 6970561
    Abstract: An encrypting apparatus includes an encrypting operation section, a determining section and a control section. The encrypting operation section carries out an encrypting operation to a plaintext using intermediate data at each of a plurality of encrypting stages of the encrypting operation to produce a ciphertext. The encrypting operation section outputs encrypting stage data indicating an encrypting state at each of the plurality of processing stages. The determining section determines whether the encrypting operation at a next encrypting stage should be changed, based on the encrypting stage data at a current encrypting stage from the encrypting operation section. The control section changing the encrypting operation at the next encrypting stage when it is determined that the encrypting operation at the next encrypting stage should be changed.
    Type: Grant
    Filed: April 20, 2000
    Date of Patent: November 29, 2005
    Assignee: NEC Corporation
    Inventor: Satoshi Obana
  • Patent number: 6810087
    Abstract: An ultra-wideband (UWB) communications system combines the techniques of a transmitted reference (TR) and a multiple access scheme called delay hopping (DH). Combining these two techniques using UWB signaling results in a penalty in signal-to-noise ratio (SNR) over conventional pulse position modulation (PPM) techniques but avoids the synchronization difficulties associated with conventional approaches. The signaling pulse waveforms are designed to insure that their power spectral densities, after any frequency translation to the center of an operating band, are essentially spectrally disjoint with frequencies that must be protected. This TR technique is combined with the DH multiple access technique to create a UWB communications scheme that has a greater multiple access capacity than does the UWB TR technique by itself.
    Type: Grant
    Filed: January 3, 2001
    Date of Patent: October 26, 2004
    Assignee: General Electric Company
    Inventors: Ralph Thomas Hoctor, Harold Woodruff Tomlinson, Jr., Kenneth Brakeley Welles, II, John Erik Hershey
  • Patent number: 6389138
    Abstract: A complex spreading and/or scrambling code sequence generation system uses a first complex code sequence having at least two components and a second complex code sequence having at least two components. The components of the first complex code sequence are respectively mixed with the corresponding components of the second complex code sequence to generate the complex scrambling code sequence. In doing so, an offset between the components of the complex scrambling code sequence is achieved for the same and/or different users. The complex scrambling code sequence can be used for spreading, scrambling, de-spreading or descrambling an information signal.
    Type: Grant
    Filed: November 12, 1998
    Date of Patent: May 14, 2002
    Assignee: Lucent Technologies Inc.
    Inventors: Quinn Li, Nallepilli S. Ramesh
  • Patent number: 5818934
    Abstract: A method for providing a secure interface between a decryption engine and a system decoder of a digital receiver, e.g., an MPEG-2 digital television receiver. The system decoder receives an encrypted bitstream and produces a cipher text bitstream which is supplied to the decryption engine via a first parallel data bus which includes a plurality N of parallel bit lines corresponding to respective N bits of the cipher text bitstream. The decryption engine decrypts the cipher text bitstream and produces a plain text bitstream which is supplied to the system decoder via a second parallel data bus which includes a plurality N of parallel bit lines corresponding to respective N bits of the plain text bitstream.
    Type: Grant
    Filed: December 18, 1996
    Date of Patent: October 6, 1998
    Assignee: Phillips Electronics North America Corporation
    Inventor: David William Cuccia
  • Patent number: 5805635
    Abstract: A secure communication system comprising:a first cyclical pseudo-random noise generator comprising determinable vable starting point means and an output;transmitting means for transmitting said pseudo-random noise generator output;receiving means for receiving said transmitting means transmissions, said receiving means having an output;recycling storage means for storing said receiving means output;a second cyclical pseudo-random noise generator identical to said first pseudo-random noise generator having an output and a reset input, said receiving means output connected to said reset input;a correlator having a first input connected to said storage means and a second input connected to said second pseudo-random noise generator output and an output from said correlator; andtiming means connected to said receiving means output and said correlator output for measuring time elapsed between any output of said receiver and said correlator.
    Type: Grant
    Filed: March 17, 1964
    Date of Patent: September 8, 1998
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Daniel E. Andrews, Jr., William E. Klund, Robert D. Isaak
  • Patent number: 5249199
    Abstract: An audio system (600) typically includes an audio signal processor (610), a controller (607) for controlling data signals, and a peripheral data source (613). The audio signal processor (610) exchanges information with a remote audio device (603) via a communication resource (605). A method of reducing spurious noise levels on the communication resource (605) includes generating a timing signal (400) having a period and randomly altering the period (409, 411, 413) of the timing signal (400) between a first predetermined value and a second predetermined value. The randomly altered timing signal are then used to effect control of the data signals, while providing a reduced level of spurious noise on the communication resource (605).
    Type: Grant
    Filed: October 30, 1992
    Date of Patent: September 28, 1993
    Assignee: Motorola, Inc.
    Inventors: Glenn N. Mayer, John Snick, Randy L. Eki
  • Patent number: 5235616
    Abstract: A bidirectional data transmission system using the technique known as spectrum spreading by direct sequence comprises a first transmitter-receiver assembly consisting of a first transmitter section which generates a coded first data signal for transmission by modulation of a radioelectrical carrier by a spreading code of which the delay is modulated under the control of the first data, and a first receiver section which receives a coded second data signal and restores the second data therefrom, and a second transmitter-receiver assembly consisting of a second transmitter section which generates the coded second data signal for transmission by modulation of a transmission carrier by a spreading code, the carrier itself being modulated by the second data, and a second receiver section which receives the coded first data signal and restores the first data therefrom by demodulation of the delay in the spreading code contained in the coded first data signal, the restored first data being used to control the delay
    Type: Grant
    Filed: September 11, 1992
    Date of Patent: August 10, 1993
    Assignee: Societe Nationale D'Etude et de Construction de Moteurs D'Aviation "S.N.E.C.M.A."
    Inventor: Bruno R. Sebilet
  • Patent number: 5058157
    Abstract: A technique for encrypting and decrypting information signals normally arranged as a succession of lines of active information, with each line having a line timing reference, such as color video information signals. The active video portion is time shifted with respect to the horizontal sync portion of the corresponding line using a predetermined slowly varying time shifting function. The time shifting information is conveyed to the decryption site by encoding the instantaneous vlue of the time shifting wave form for the beginning of each field in the vertical blanking portion of that field. To provide a reasonable maximum time shifting range, portions of the trailing edge of the active video in the preceding line and portions of the leading edge of the active video in the current line are discarded. During decryption, the original line timing and color burst signals are discarded and new signals are generated which are time displaced from the actie video portion by the original amount before encryption.
    Type: Grant
    Filed: September 6, 1989
    Date of Patent: October 15, 1991
    Assignee: Macrovision Corporation
    Inventor: John O. Ryan
  • Patent number: 4953211
    Abstract: Encryption apparatus mainly intended for encrypting speech signals samples a signal to be encrypted at two differing rates, and reads the sampled signal into storage means at one of said rates and reads it out of said storage at the other of said rates so that the signal is alternately dispersed upwardly and downwardly with each pair of upward and downward dispersion representing a frame. To improve security the apparatus further generates a pseudo random binary number, defines a superframe structure consisting of a predetermined number of said frames, and sets the starting point of each individual superframe as an upward or a downward dispersion in dependence on the next digit of said pseudo-random binary number.
    Type: Grant
    Filed: July 5, 1989
    Date of Patent: August 28, 1990
    Assignee: Marconi Electronic Devices Limited
    Inventors: Andrew S. Repton, Martin Lysejko
  • Patent number: 4937867
    Abstract: A method for scrambling speech such as in a mobile land based communication system is disclosed. Essentially, variable length time samples of digitized speech are stored and time inversion scrambled. The scrambled speech is converted back to analog form and transmitted to a receiver which reciprocates the process to reproduce the desired speech signals. Scrambling and descrambling of the speech signal is synchronized to provide corresponding sample time inversions and accurate reproduction of the speech input signal. The level of security afforded by the scrambling method may be varied by varying the length of the sampling period or by mixing forward and reverse time samples under control of an algorithm.
    Type: Grant
    Filed: May 1, 1989
    Date of Patent: June 26, 1990
    Assignee: Teletec Corporation
    Inventors: Kaspar A. Kasparian, John D. Ide
  • Patent number: 4916736
    Abstract: Time sequential information signals, such as color video signals having a line timing reference and an active video portion, are encrypted by time shifting the active video signal portion towards and away from the line timing reference signal in psuedo-random fashion prior to broadcasting or recording on tape or disk and transmittal to the user. The signals are decrypted by an inverse time shifting technique. By limiting the amount of time shifting between lines, potential signal degradation for color video signals is minimized, and drop out compensation processing is minimally affected, so that the color resolution and picture quality are substantially unaffected.
    Type: Grant
    Filed: June 7, 1988
    Date of Patent: April 10, 1990
    Assignee: Macrovision Corporation
    Inventor: John O. Ryan
  • Patent number: RE35078
    Abstract: A technique for encrypting and decrypting information signals normally arranged as a succession of lines of active information, with each line having a line timing reference, such as color video information signals. The active video portion is time shifted with respect to the horizontal sync portion of the corresponding line using a predetermined slowly varying time shifting function. The time shifting information is conveyed to the decryption site by encoding the instantaneous value of the time shifting wave form for the beginning of each field in the vertical blanking portion of that field. To provide a reasonable maximum time shifting range, portions of the trailing edge of the active video in the preceding line and portions of the leading edge of the active video in the current line are discarded. During decryption, the original line timing and color burst signals are discarded and new signals are generated which are time displaced from the active video portion by the original amount before encryption.
    Type: Grant
    Filed: October 15, 1993
    Date of Patent: October 31, 1995
    Assignee: Macrovision Corporation
    Inventor: John O. Ryan