Patents Examined by David C. Cain
  • Patent number: 5708715
    Abstract: An integrated circuit device (chip) has lock circuitry that controls operational enablement of a functional block of the chip. To unlock the lock circuitry, a "chip-key" must be supplied to the chip over a secure communications link, the chip-key being communicated in encrypted form and then decrypted in a secure communication block of the chip. To prevent internal examination of the chip revealing the chip key, the latter is not stored as such in the chip. Instead, only a signature of the chip-key is stored, the latter being formed from the chip-key by subjecting the latter to a one-way function. The chip-key input to the lock circuitry is subjected to the same one-way function in block before being compared with the stored chip-key in comparator; if a match is found, a gating circuit is enabled to pass a necessary signal (such as a clock signal) to the functional block.
    Type: Grant
    Filed: April 30, 1996
    Date of Patent: January 13, 1998
    Assignee: Hewlett-Packard Company
    Inventor: Dominique Vicard
  • Patent number: 5701343
    Abstract: A digital information protection scheme using an improved security protocol. In a system in which a user makes an access to a digital information provided by an information center by connecting a computer card owned by the user to an information terminal device connected with the information center, a work key for encrypting a desired digital information is delivered from the information center to the computer card through the information terminal device, and the work key is registered in the computer card; the desired digital information encrypted by the work key is delivered from the information center to the information terminal device; and an encrypted digital information delivered from the information center is decrypted at the information terminal device by using the work key registered in the computer card, and a decrypted digital information is provided to the user at the information terminal device.
    Type: Grant
    Filed: November 29, 1995
    Date of Patent: December 23, 1997
    Assignee: Nippon Telegraph & Telephone Corporation
    Inventors: Youichi Takashima, Shinji Ishii, Kiyoshi Yamanaka
  • Patent number: 5699427
    Abstract: A system for identifying the authorized receiver of any particular copy of a document. More specifically, each particular copy of a document is fingerprinted by applying a set of variations to a document, where each variation is a change in data contents, but does not change the meaning or perusal experience of the document. A database associating a set of variants to a receiver is maintained. Thus any variant or copy of that variant can be traced to an authorized receiver.
    Type: Grant
    Filed: June 23, 1995
    Date of Patent: December 16, 1997
    Assignee: International Business Machines Corporation
    Inventors: Chee-Seng Chow, Shay Kutten, Marcell Mordechay Yung
  • Patent number: 5699429
    Abstract: Apparatus for selecting predetermined ones of packets of signal components, from a signal stream of packets includes a control device, responsive to user selection and a transmitted program guide, for determining packet identifier codes, SCID's, for respective program signal components. SCID's, from respective packets in the signal stream, are successively compared with selected, stored SCID's. Transmitted signal components associated with appropriately detected SCID's are coupled to decryption apparatus. The decryption apparatus selects from a plurality of decryption keys in accordance with decryption flags include in transmitted signal packets. Decryption keys per se are provided by a smart card.
    Type: Grant
    Filed: March 19, 1997
    Date of Patent: December 16, 1997
    Assignee: Thomson Consumer Electronics, Inc.
    Inventors: Gregory George Tamer, Michael Scott Deiss
  • Patent number: 5699430
    Abstract: An electronic security method and apparatus prevents unauthorized access to a security device, communications equipment or other equipment by generating a data coded signal between an encoding device couple with a transmitter and a decoding device coupled with a receiver; part of the coded signal is fixed but the remainder is continuously and automatically changing with reference to time and synchronization is maintained between transmitter and receiver by an identical timer chip clock in each which operates on the same oscillation frequency; specially designed computer software is used to program an identical microcontroller unit within the transmitter and the receiver.
    Type: Grant
    Filed: September 12, 1995
    Date of Patent: December 16, 1997
    Inventors: Mario John Krizay, Sam Lazarakis
  • Patent number: 5696828
    Abstract: The present invention teaches a method of generating a plurality of random numbers is disclosed. The method comprises the initial step of generating chaotic noise. Subsequently, the chaotic noise is sampled such that a plurality of samples are created. Each sample of the plurality of samples is then converted into digital data such that each converted sample corresponds with a random number of the plurality of random numbers.
    Type: Grant
    Filed: September 22, 1995
    Date of Patent: December 9, 1997
    Assignee: United Technologies Automotive, Inc.
    Inventor: Philip J. Koopman, Jr.
  • Patent number: 5689566
    Abstract: A system which uses three way password authentication, encrypting different portions of a logon packet with different keys based on the nature of the communications link. Nodes attached to a particular LAN can have one level of security for data transfer within the LAN while data transfers between LANs on a private network can have a second level of security and LANs connected via public networks can have a third level of security. The level of security can optionally be selected by the user. Data transfers between nodes of a network are kept in separate queues to reduce queue search times and enhance performance.
    Type: Grant
    Filed: October 24, 1995
    Date of Patent: November 18, 1997
    Inventor: Minhtam C. Nguyen
  • Patent number: 5687237
    Abstract: A microcontroller is in bus communication with an improved integrated circuit for providing data to the integrated circuit and reading data from the integrated circuit. The integrated circuit selectively processes data by encrypting or decrypting the data. The integrated circuit includes a data register for receiving data from the microcontroller via the data bus and storing the data. A DES key register is also provided for receiving and storing a key (Ks) from the controller via the data bus and a DES control register is provided for receiving and storing control signal from the controller via the data bus. The integrated circuit has a digital encryption engine module for reading the data from the data register and the DES key register in response to specific control signal stored in as DES control register and for processing the data utilizing the key (Ks) and outputting the encrypted data. A second DES key register (Kv) isolated from the data bus stores second key(Kv).
    Type: Grant
    Filed: November 13, 1995
    Date of Patent: November 11, 1997
    Assignee: Pitney Bowes Inc.
    Inventor: Edward J. Naclerio
  • Patent number: 5680460
    Abstract: A key generation system is implemented as follows. In an enrolment apparatus, a unique number for use with PIN operated machines or public key cryptography systems is generated by manipulation of fingerprint information of a subscriber. A filter is then generated which is a function both of the Fourier transform of the subscriber's fingerprint(s) and of the unique number. This filter is stored on a subscriber card. When the subscriber wishes to generate his key, he inputs his card to a card reader of an apparatus and places his finger(s) on a fingerprint input. The apparatus generates an optical Fourier transform from the fingerprint input. The Fourier transform signal is incident on to a spatial light modulator programmed with the filter information from the card. An inverse transform is generated from the filtered signal and this is used to regenerate the key that will be used as the PIN in a PIN operated device, or as the private key cryptography system.
    Type: Grant
    Filed: August 8, 1995
    Date of Patent: October 21, 1997
    Assignee: Mytec Technologies, Inc.
    Inventors: George J. Tomko, Colin Soutar, Gregory J. Schmidt
  • Patent number: 5680459
    Abstract: The present invention relates to an electronic identification system comprising one or more transponders which store identification and other information in memory, and readers, which capture information from the transponders and write new information thereto, and in which communications between transponders and readers are accomplished using radio frequency signals. The present invention has attributes which make it particularly useful in automatic fare collection systems, where transponders, typically in the form of thin cards and used as pre-paid tickets, are carried by fare paying passengers to replace printed tickets and eliminate exchange of cash. Specifically the system achieves simultaneous identification of numerous transponders by one reader, permits a reader to selectively program any of many transponders under its control, exhibits fast transaction speed to maximize passenger throughput, and achieves exceptional data storage integrity.
    Type: Grant
    Filed: April 28, 1995
    Date of Patent: October 21, 1997
    Assignee: Kasten Chase Applied Research Limited
    Inventors: Christopher Hook, Keith Juson, Chris Hall, Donald Harold Ferguson, Dimitrie Octavian Paun, Alexandru Oprea
  • Patent number: 5680453
    Abstract: In order to realize an optimal software distributing form involving a software storing medium distributor and a communication company which provides software by utilizing communication lines, a center device for providing specified software to a user by ciphering it, a relaying device and a user terminal device are provided, and the center and the relaying device are made to carry out ciphering in a mode optimal to the software supply mode.
    Type: Grant
    Filed: August 3, 1995
    Date of Patent: October 21, 1997
    Assignee: Fujitsu Limited
    Inventors: Ryota Akiyama, Makoto Yoshioka
  • Patent number: 5677953
    Abstract: The system and method of the present invention provides the support of high density removable media, such as CD-ROM or MO, to be used as a distributed media for storing data where access thereto is securely restricted. Through this system and method, the secure periodic distribution of several different sets of data information to the end user is achieved with access control selectively performed by at the user's site through communication with the billing/access center. User billing is based on the purchase of the decryption access codes as indicated by the access code attributes encoded on the media. Access code availability is further controlled by selectively providing for updates of decryption access codes.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: October 14, 1997
    Assignee: Spyrus, Inc.
    Inventor: Janet L. Dolphin
  • Patent number: 5677954
    Abstract: When an incoming call corresponding to a communication number PID takes place in a switching station, the switching station retrieves user-intrinsic information UK and an incoming-communication registered terminal identification number SID and sends the communication number PID to a communication terminal. When the communication terminal replies, the switching station generates a random number R and sends it to the communication terminal. In addition, the switching station generates a cryptical key K=F (R, UK) corresponding to the user-intrinsic information UK and the random number R. The communication terminal generates a cryptical key K=F (R, UK) corresponding to the received random number R and the user-intrinsic information UK that is input by the user. The switching station and the communication terminal encrypt the communication information corresponding to the cryptical key K and decrypt received encrypted communication information.
    Type: Grant
    Filed: January 12, 1995
    Date of Patent: October 14, 1997
    Assignee: NTT Mobile Communications Network, Inc.
    Inventors: Shoichi Hirata, Yasuyuki Uchiyama, Hiroshi Tsukahara, Masami Yabusaki
  • Patent number: 5677928
    Abstract: Digital information is convolved with a pseudorandom code and then transmitted at radio frequency in a spread spectrum signal to a receiver also containing the same pseudorandom code. Since the transmitted signal is below the noise floor for that bandwidth, it is virtually unjammable and undetectable without possession of the pseudorandom code. Successful extraction of the transmitted information depends upon precise matching of the transmitted frequency and the exact phase matching of the pseudorandom code at the receiver with the convolved pseudorandom code in the transmitted signal.
    Type: Grant
    Filed: November 18, 1991
    Date of Patent: October 14, 1997
    Assignee: McDonnell Douglas Corp.
    Inventors: Michael A. Rizzo, Robert E. Gorney, Mark T. Primich
  • Patent number: 5675654
    Abstract: A transport decoder 110, for receiving and processing a transport data stream using MPEG-2 formats, includes connections to a physical layer channel interface (channel interface) 112, a buffer memory 114, a host microprocessor 116, audio and video decoders 118/120, and clock signal circuitry 122. The transport decoder also includes an interface to a decoder which does not include a "data valid" input terminal. Upon receipt of encoded data packets, the transport decoder recognizes a frame synchronization byte and transfers an encoded data packet to an external decoder via the interface. The transport decoder sets a count value for a predetermined number of bytes in the encoded data packet and sends the packet data to the external decoder. When the specified number of bytes have been sent to the external decoder, the transport decoder determines if another synchronization byte has been encountered.
    Type: Grant
    Filed: March 29, 1996
    Date of Patent: October 7, 1997
    Assignee: Matsushita Electric Corporation of America
    Inventor: Robert T. Ryan
  • Patent number: 5675653
    Abstract: The present invention is a real time digital encryption system which may be implemented in either hardware or software. The encryption system uses keys and an algorithm in which the encryption is determined in part by the data being encrypted, to obtain a scramble which is uniquely determined by the combination of the encryption keys and the data being encrypted, thereby making any effort at cryptanalysis extremely difficult, if not impossible. Consequently, anyone seeking to decrypt the data encrypted by the present invention would have to resort to an extensive brute force approach to such decryption efforts.
    Type: Grant
    Filed: November 6, 1995
    Date of Patent: October 7, 1997
    Inventor: Douglas Valmore Nelson, Jr.
  • Patent number: 5675649
    Abstract: A process for cryptographic key generation and safekeeping is provided. A plurality of key agents are selected, each having a copy of the source code. One copy of the source code is loaded onto a secure computer system and is compared with at least one other copy of the source code to validate the loaded copy of the source code. Master key information and locking key information are generated by executing compiled source code. The master key information is then separated into a plurality of master key shares which are distributed to master key agents such that each master key agent possesses one master key share. The locking key information is separated into a plurality of locking key shares which are distributed to locking key agents such that each locking key agent possesses one locking key share. Then, the plurality of locking key shares and the plurality of master key shares are validated, and the secure computer system is securely shut down.
    Type: Grant
    Filed: November 30, 1995
    Date of Patent: October 7, 1997
    Assignee: Electronic Data Systems Corporation
    Inventors: J. J. Brennan, Bruce K. Geist, Jeffrey A. Van Eeuwen
  • Patent number: 5675651
    Abstract: A method uses portable objects where the reading and writing of data in the memory are free, owing to the writing in the latter, if necessary, of elements which can be prepared and verified only if secret information kept both in a secure memory at the control center and in a secure memory in the machine with which the transmission is carried out is known.
    Type: Grant
    Filed: August 22, 1995
    Date of Patent: October 7, 1997
    Assignee: SECAP
    Inventors: Jean-Philippe Bailleux, Claude Martin
  • Patent number: 5673317
    Abstract: In a wireless network access device, access to which is controlled by a control program retained in a memory in the device, a method of preventing unauthorized access to the device comprising the steps of: storing in the memory of the device, data representing a key code and an access enabling code; reading the key code from the device and generating, in accord with a known method, an access code based thereon; and, comparing the access code with the access enabling code and, if equal, enabling access to the device, otherwise denying access to the device. The invention also includes a system and a wireless network access device both of which prevent unauthorized access for reprogramming purposes.
    Type: Grant
    Filed: March 22, 1995
    Date of Patent: September 30, 1997
    Assignee: Ora Electronics, Inc.
    Inventor: Gershon N. Cooper
  • Patent number: 5673316
    Abstract: A method and apparatus to create, distribute, sell and control access to digital documents using secure cryptographic envelopes. An envelope is an aggregation of information parts, where each of the parts to be protected are encrypted with a corresponding part encryption key. These encrypted information parts along with the other information parts become part of the envelope. Each part encryption key is also encrypted with a public key, and these encrypted part encryption keys are also included in the envelope. The envelope also includes a list of parts where each entry in the list has a part name and a secure hash of the named part. The list is then signed with a secret key to generate a signature, which is also included in the envelope. The signature can be verified using a second public key associated with first secret key, and the integrity of any information part in the envelope can be checked by computing a second hash and comparing it with the corresponding hash in the list of parts.
    Type: Grant
    Filed: March 29, 1996
    Date of Patent: September 30, 1997
    Assignee: International Business Machines Corporation
    Inventors: Joshua Seth Auerbach, Chee-Seng Chow, Marc Adam Kaplan, Jeffrey Charles Crigler