Having Magnetic Record Carrier (e.g., Tape, Drum) Patents (Class 380/22)
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Patent number: 5751595Abstract: A method for verifying that an integrated circuit design tool kit has not been modified in an unauthorized manner is accomplished by providing a verification procedure that, when an executable subrule of the tool kit has been selected to be part of the rule system, the executable subrule reads a table of time stamps. This table of time stamps and a key are provided, as representative data, to an authentication subrule by the executable subrule. The executable subrule and the authentication subrule perform an authentication check algorithm upon the representative data to produce remotely and locally checked data respectively. The executable subrule then provides the locally checked data to the authentication subrule which compares the locally checked data with the remotely checked data. When a match occurs between the data, the authentication subrule indicates that the executable subrule has not been modified in an unauthorized manner.Type: GrantFiled: March 14, 1996Date of Patent: May 12, 1998Assignee: International Business Machines CorporationInventors: Harry John Beatty, III, Peter Claude Elmendorf, Jeannie Harrigan Panner, Bijan Salimi, Lansing Dunn Pickup
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Patent number: 5715313Abstract: Information is recorded on a floppy disk in a state in which the confidentiality of the information is maintained. An ID signal representing ID information is magnetically recorded down to the lower layer of a floppy disk when data is recorded. A data signal representing information (a data file) to be recorded is also magnetically recorded down to the lower layer of the floppy disk. A security signal is magnetically recorded on the upper layer of the floppy disk over at least the data signal that has been recorded on the lower layer of the floppy disk. At the time of data reproduction, the ID signal is reproduced from the floppy disk and the ID information represented by the reproduced ID signal is compared with entered ID information. When the two items of compared ID information agree, the security signal that has been recorded on the upper layer of the floppy disk is erased. The data signal that has been recorded on the lower layer of the floppy disk is then reproduced.Type: GrantFiled: September 28, 1995Date of Patent: February 3, 1998Assignee: Fuji Photo Film Co., Ltd.Inventors: Fumiaki Tsukuda, Tsutomu Sugisaki, Yasushi Endo
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Patent number: 5546462Abstract: A method and apparatus is disclosed for determining the remanent noise in a magnetic medium by, for example, DC saturation of a region thereof and measurement of the remaining DC magnetization. A conventional magnetic recording transducer may be used to determine the remanent noise. Upon determination, the remanent noise may then be digitized and recorded on the same magnetic medium to thereby "fingerprint" the magnetic medium. This "fingerprint" may then be later used to verify and authenticate the magnetic medium as being an original. The magnetic medium may be of a type adapted to record information magnetically or, even more broadly, any magnetic surface or substance that can be sensed through its magnetic field. In such manner, any magnetic medium, or any object having an associated magnetic medium, may be "fingerprinted" including credit cards, computer program diskettes, magneto-optic discs, videotapes, cassette tapes, bank checks, stock certificates, etc.Type: GrantFiled: September 9, 1994Date of Patent: August 13, 1996Assignee: Washington UniversityInventors: Ronald S. Indeck, Marcel W. Muller, George Lawrence Engel, Alan L. Hege
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Patent number: 5513260Abstract: A method and apparatus for copyright protection for various recording media such as compact discs (CDs) uses a combination of symmetrical and asymmetrical data encryption to permit the player to handle either copy-protected or non-copy-protected media, in a manner that is extremely difficult to compromise. Coupled with the combination of encrypting methods, an Authenticating Signature is recorded on the media only when copy-protection is required. The nature of this Authenticating Signature is such that it will not be transferred to illicit copies made on CD recorders. When either an original protected or an original non-protected disk is played, the presence or absence of the Authenticating Signature causes the player to correctly decrypt the program data. All original CDs therefore play normally. When a copy of a non-protected CD is played, the absence of the Authenticating Signature also causes the player to correctly decrypt the program data.Type: GrantFiled: June 29, 1994Date of Patent: April 30, 1996Assignee: Macrovision CorporationInventor: John O. Ryan
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Patent number: 5481609Abstract: A system for controlling access to broadcast transmissions including a transmitter having a transmission encoder for scrambling the broadcast, a multiplicity of subscriber receivers, each having an identical receiving decoder, containing no secret cryptographic keys, for descrambling the broadcast and a plurality of selectable and portable executing apparatus each being operatively associatable with a receiving decoder at a partially different given time and each executing generally identical operations to generate a seed for use by the associated receiving decoder to enable the receiving decoder to descramble the broadcast.Type: GrantFiled: September 10, 1993Date of Patent: January 2, 1996Assignee: News Data Security Products Ltd.Inventors: Michael Cohen, Jonathan Hashkes
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Patent number: 5479510Abstract: A method of data transmission over existing telephone lines and later verification of that transmission includes electronic payment verification using telephone transmission of payment information and return transmission of a unique card account number, storage of the information and account number on a database and a data card through a data storage device, and verification of the infomation and account number at a later time by a separate data storage device and the same database.Type: GrantFiled: November 15, 1994Date of Patent: December 26, 1995Inventors: Kurt B. Olsen, Charles F. Olsen, Stuart H. Kupinsky
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Patent number: 5442706Abstract: A method of secure data transfer by physical transport of an electronic storage device wherein the sender, using a type 1 encryption/decryption algorithm, sequentially encrypts data, in any order, with the public key of the receiver and the private key of the sender and then stores then the encrypted data on the transportable electronic storage medium. The receiver, upon receipt of the transportable electronic storage medium, sequentially, in the reverse order of public key/private key use, decrypts using the type 1 encryption/decryption algorithm for said decryption, the data stored on the transportable electronic storage medium with the public key of said sender and the private key of the receiver to provide data in its state prior to by the sender.Type: GrantFiled: February 27, 1992Date of Patent: August 15, 1995Assignee: Hughes Aircraft CompanyInventor: Kenneth C. Kung
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Patent number: 5337358Abstract: Apparatus for recording a transaction where the transaction includes authenticating an identification card; the card having information pertaining to an object or other entity to be identified on a first portion in human recognizable form, and a coded representation of an encrypted signal comprising a representation of the information on a second portion. The apparatus includes a controller, a scanner for reading the coded representation, a decoder for decoding that representation, a decrypter for decrypting the decoded signal and a display for displaying the representation of the information.Type: GrantFiled: November 20, 1992Date of Patent: August 9, 1994Assignee: Pitney Bowes Inc.Inventors: Barry H. Axelrod, John T. Balga, Jr., Edward P. Cornell
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Patent number: 5321753Abstract: A method and apparatus (10) for the secure transmission of static data (16) from a tag (11) to a remote reader (12). Each time the static data (16) is to be transmitted to the reader (12), the 10 bits of static data (16) are combined with 54 bits of binary data (21), which constantly change from one transmission to the next, into a 64-bit number (22). This number is then encrypted and transmitted to the remote reader (12) where it is decrypted (26) to produce the same 64 bit number that was encrypted in the tag (11). With a continual change in the value of the 64 bit number (22) in the tag, the encrypted numbers transmitted to the reader (12) will appear to be dynamic in character rather than being static.Type: GrantFiled: July 8, 1991Date of Patent: June 14, 1994Assignee: The United States of America as represented by the United States Department of EnergyInventor: Dale G. Gritton
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Patent number: 5307412Abstract: In a random coding cipher system and method, a sender and receiver pair share a long string of random digits, the masking tape. To encrypt a plaintext message, the sender generates a random integer (with a random number generator, RNG) or a pseudo-random integer (using a pseudo-random number generator, PRNG). This is the initializing integer. The sender then selects an integer formed from a subset of the digits of the initializing integer. This is the starting integer for the message. The starting integer determines a starting, or indexing, position in the masking tape for extraction of a sequence of blocks of digits, of common length, to be put in one-to-one correspondence with the characters of the plaintext alphabet used for communication. The integer blocks comprise the numerical synonyms for the plaintext alphabet characters.Type: GrantFiled: September 30, 1992Date of Patent: April 26, 1994Inventor: Arnold R. Vobach
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Patent number: 5297202Abstract: A method and system for generating a completed payment document ready for signature in image form. The document is signed by a customer and a copy of the signature is captured in digital form. Thereafter the signature is encrypted and saved along with a digital record of the transaction.Type: GrantFiled: November 20, 1992Date of Patent: March 22, 1994Assignee: NCR CorporationInventors: Michael A. Kapp, Robert L. Protheroe, Albert Onega
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Patent number: 5282249Abstract: A system for controlling access to broadcast transmissions including a transmitter having a transmission encoder for scrambling the broadcast, a multiplicity of subscriber receivers, each having an identical receiving decoder, containing no secret cryptographic keys, for descrambling the broadcast and a plurality of selectable and portable executing apparatus each being operatively associatable with a receiving decoder at a partially different given time and each executing generally identical operations to generate a seed for use by the associated receiving decoder to enable the receiving decoder to descramble the broadcast.Type: GrantFiled: December 18, 1992Date of Patent: January 25, 1994Inventors: Michael Cohen, Jonathan Hashkes
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Patent number: 5202922Abstract: When a final session is performed between a host device and an IC card, common key data stored in the host device is encrypted by an updated session key and transmitted to the IC card in which the encrypted common key data is decrypted by the the same updated session key to obtain the common key data which is stored in the IC card for the following sessions to be performed later.Type: GrantFiled: November 29, 1991Date of Patent: April 13, 1993Assignee: Kabushiki Kaisha ToshibaInventor: Yasuo Iijima
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Patent number: 5195133Abstract: A method and system for generating a completed payment document ready for signature in image form. The document is signed by a customer and a copy of the signature is captured in digital form. Thereafter the signature is encrypted and saved along with a digital record of the transaction.Type: GrantFiled: January 11, 1991Date of Patent: March 16, 1993Assignee: NCR CorporationInventors: Michael A. Kapp, Robert L. Protheroe, Albert Onega
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Patent number: 5177344Abstract: A randomly varying modulated current is generated and used to drive a magnetic write head in an apparatus for enhancing a randomly varying magnetic security characteristic of a medium. The write head can be positioned adjacent a fluid magnetic slurry for the purpose of altering the location of the various magnetic particles therein in a random fashion. The slurry can then be hardened thermally or using ultraviolet dryers. A circuit which can generate the randomly variable current for the read head includes a modulator which receives a first randomly variable signal and a second, different randomly varying signal which modulates the first signal.Type: GrantFiled: October 5, 1990Date of Patent: January 5, 1993Assignee: Rand McNally & CompanyInventor: Kevin J. Pease
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Patent number: 5097504Abstract: An encrypted signature S representative of the information and of the identity of the holder of the information is established by means of a calculation algorithm for the encryption and the compression of the information to be saved. The signature S is recorded on the medium carrying the information forming the message M. The parameters for the calculation of the signature S, one or several secret keys, are recorded on at least one inviolable carrying medium. The application is to qualitative safeguarding and protection of data, on-line or not, in data bases.Type: GrantFiled: November 18, 1987Date of Patent: March 17, 1992Assignee: InfoscriptInventors: Paul Camion, Jean Goutay, Sami Harari
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Patent number: 5040210Abstract: A tape cassette which locks up to prevent more than one play through of the information carrying portion of the cassette has a label with an encrypted unlocking combination for the cassette along with a memory address for a key code needed to decrypt the combination. A locked up cassette may be inserted in an unlock terminal which reads the information on the label and looks in memory at the address on the label for a key code. The returned key code is used to decrypt the unlocking combination read from the label and the unlocking combination is applied to unlock the cassette. A host may intermittently communicate with the unlock terminal in order to update the memory of the unlock terminal.Type: GrantFiled: July 30, 1990Date of Patent: August 13, 1991Assignees: Arena Recreations (Toronto), William Lawrence HeiseyInventor: Joseph Anderson
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Patent number: 4937864Abstract: Debug routine accessing system using special keys in the form of floppy disks for unlocking debug routines embedded in the operating software of a reproduction machine, each debug routine having a key number, with the floppy disks having various key numbers for different ones of the debug routines so that on insertion of a selected disk in the machine floppy disk port, the key number is read from the disk and compared with the key numbers of the various debug routines until a match is found enabling the debug routine represented by the key number to be accessed.Type: GrantFiled: April 27, 1989Date of Patent: June 26, 1990Assignee: Xerox CorporationInventors: Paul D. Caseiras, Joseph L. Filion, Eugene S. Evanitsky
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Patent number: 4644493Abstract: Method and apparatus which restricts software, distributed on magnetic media, to use on a single computing machine. The original medium is functionally uncopyable, until it is modified by the execution of a program stored in a tamper proof co-processor which forms a part of the computing machine. The modified software on the original medium may then be copied, but the copy is operable only on the computing machine containing the co-processor that performed the modification.Type: GrantFiled: September 14, 1984Date of Patent: February 17, 1987Assignee: International Business Machines CorporationInventors: Akhileshwari N. Chandra, Liam D. Comerford, Steve R. White
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Patent number: RE35599Abstract: A randomly varying modulated current is generated and used to drive a magnetic write head in an apparatus for enhancing a randomly varying magnetic security characteristic of a medium. The write head can be positioned adjacent a fluid magnetic slurry for the purpose of altering the location of the various magnetic particles therein in a random fashion. The slurry can then be hardened thermally or using ultraviolet dryers. A circuit which can generate the randomly variable current for the read head includes a modulator which receives a first randomly variable signal and a second, different randomly varying signal which modulates the first signal.Type: GrantFiled: January 4, 1995Date of Patent: September 2, 1997Assignee: DocuSystems, Inc.Inventor: Kevin J. Pease