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| Number | Title | Issue Date |
| 7860239 | Method and apparatus for metering usage of software products using multiple signatures A method and a corresponding apparatus for metering usage of software products on a computer are proposed. The solution of the invention is based on the idea of associating each product with an installation signature (indicative of the installation of the product on... | 12/28/2010 |
| 7742594 | Pipelined packet encryption and decryption using counter mode with cipher-block chaining message authentication code protocol An apparatus and corresponding method and computer program comprises a key mixing circuit to generate N groups of AES Blocks, each generated based upon a key, a transmitter MAC address, and a start value for a packet number. An input circuit receives N encrypted MPD... | 06/22/2010 |
| 7401221 | Advanced stream format (ASF) data stream header object protection A header object for a data file is comprised of sub-objects which specify properties of the data stream and contains information needed to properly verify and interpret the information within the data object. In order to allow the protection of any set of sub-object... | 07/15/2008 |
| 7299493 | Techniques for dynamically establishing and managing authentication and trust relationships Techniques are provided for dynamically establishing and managing authentication and trust relationships. An identity service acquires and evaluates contracts associated with relationships between principals. The contracts permit the identity service to assemble aut... | 11/20/2007 |
| 7239709 | Data recording/reproducing method, data recording/reproducing system, recording apparatus A data recording/reproducing method wherein encrypted digital data obtained by subjecting digital data to first encrypting by using a contents key and encrypted contents key obtained by subjecting the contents key to second encrypting are recorded on a recording med... | 07/03/2007 |
| 7225164 | Method and apparatus for implementing revocation in broadcast networks A method of revoking a descrambling privilege for copy controlled content to a host device is provided. The method includes receiving copy controlled content at a conditional access module. A revocation list is also received at the module. The method includes determ... | 05/29/2007 |
| 7224801 | Wireless secure device A method and apparatus for securely connecting one or more wireless peripheral devices such as keyboards, mice, gamepads, remote controllers, joysticks and one or more host systems such as personal computers or workstations, the secure connection reducing the vulner... | 05/29/2007 |
| 7043645 | Reproducing apparatus, recording apparatus and display apparatus A reproducing apparatus for reproducing data from a recording medium and supplying the data to an external apparatus for recording of the data. The reproducing apparatus has a plurality of authenticators for authenticating the external apparatus and the reproducing ... | 05/09/2006 |
| 6952478 | Method and system for performing permutations using permutation instructions based on modified omega and flip stages The present invention provides permutation instructions which can be used in software executed in a programmable processor for solving permutation problems in cryptography, multimedia and other applications. The permute instructions are based on an omega-flip networ... | 10/04/2005 |
| 6892022 | Storing and retrieving encoded data stream with specified time of delivery on a hard disk In an embodiment of the invention, a method is provided for storing multimedia information to a medium. In another embodiment, a method is provided for retrieving multimedia information stored on a medium. ... | 05/10/2005 |
| 6587948 | Recording apparatus, recording medium, playback apparatus, recording method and playback method A recording method and a recording apparatus whereby digital data is recorded onto a disc as run-length limited code used for modulating marks or spaces on the disc and, at the same time, the recorded digital data is encrypted by using key data which is a... | 07/01/2003 |
| 6496107 | Voice-controlled vehicle control system A vehicle control system for permitting voice control of at least one device in a vehicle by at least one user includes a radio transponder unit which outputs an RF signal which includes an identification code; an electronic receiver for receiving the RF ... | 12/17/2002 |
| 6175625 | Control circuits for electric coding machines The machine involves code wheels in cascade or in a maze with random or mixed circuits which operate a printing device to print the cipher conjugate of the letter on an operated key when the keyboard is connected to one end of the code wheel maze, and to ... | 01/16/2001 |
| 6130946 | Cryptographs The cryptographic system automatically and continuously changes the cipher equivalents representing plaintext characters so as to prevent any periodicity in the relationship. The system has a series of juxtaposed, rotatable, connection changing mechanisms... | 10/10/2000 |
| 6097812 | Cryptographic system The crytographic system automatically and continuously changes the cipher equivalents representing plaintext characters so as to prevent any periodicity in the relationship. The system has a series of juxtaposed, rotatable, connection changing mechanisms ... | 08/01/2000 |
| 6083667 | Optical recording medium An optical recording medium includes a transparent substrate having a surface formed with a track of pits. A reflecting layer extends on the surface of the transparent substrate. The pits include first-type pits and second-type pits. The first-type pits a... | 07/04/2000 |
| 6055635 | Method and device for facilitating access to a multitude of alphanumeric sequences A method and a device for facilitating authorized and simultaneously restraining unauthorized access to a multitude of alphanumeric sequences, for instance for credit cards, code keys and the like. According to the method every correct sequence (e.g. 5533... | 04/25/2000 |
| 5724427 | Method and apparatus for autokey rotor encryption A method an apparatus for block or stream encrypting text uses an autokeyed rotational state vector to encrypt plain text to yield cipher text. The text is stored as a block in a buffer of an arbitrary number of bytes. Each byte of plain text in the buffe... | 03/03/1998 |
| 4675477 | Electronic device providing automatic permutations of a Vigenere Square This invention relates to cryptographic teletypewriter systems and more picularly to an electronic device for use in such systems which automatically provides permutations of a Vigenere Square.... | 06/23/1987 |
| 4401973 | Cycle limiting means for an electromechanical decoder 1. A mechanism comprising a base member, a shaft supported by the base member, a rotatable code wheel assembly including a first wheel element and a second wheel element, carried by the shaft a plurality of code posts carried by one of said wheel elements... | 08/30/1983 |
| 4343967 | Autokey code generator 1. In an autokey code generator for use in secret communication systems, the combination of a source of cipher text code in pulse form; a source of reset pulses having a repetition period equal to the cipher text code interval; a dynamic pulse storage net... | 08/10/1982 |
| 4208545 | Secrecy system 1. In a system of secret telegraph communication, an incoming channel over which miscellaneous matter intelligence signals are periodically received, an outgoing channel susceptible of operating at a higher speed than said incoming channel, a cipher unit ... | 06/17/1980 |
| 4204088 | Means for establishing various communication conditions in a cryptographic system 4. In a telegraph system, interconnected stations, converters at each station comprising transmitting and receiving apparatus, a signal line connected to said stations, said transmitting apparatus comprising a series of cam controlled transmitting contact... | 05/20/1980 |
| 4187393 | Key generator 2. An apparatus for producing a substantially noncyclic sequence of binary electric values, including a driving gear, a plurality of driven gears associated with said driving gear, each of said driven gears having a pattern disc carried thereby, each said... | 02/05/1980 |
| 4182929 | Circuit for simulating the scrambling of an electromechanical rotor 1. A circuit for simulating the scrambling of an electromechanical rotor of the type wherein an input to an input contact on one side of the rotor appears on one of a plurality of output contacts on the other side of the rotor in accordance with the wirin... | 01/08/1980 |
| 4177486 | Facsimile device 1. In a facsimile system, a distributor including an array of n electrical contacts, a source of potential therefor and a normally rotating brush for applying potential from said source to said contacts in sequence, a plurality of cryptographic rotors in ... | 12/04/1979 |
| 4177485 | Facsimile apparatus 1. In a facsimile apparatus, means for producing a stepped signal, the amplitudes of the steps being substantially dependent upon the photographic density of the subject and the durations of the steps being predetermined, a combining circuit and means for... | 12/04/1979 |
| 4173025 | Electrical signal scrambling apparatus 2. In an apparatus of the nature described, the combination of means for storing a portion of an electrical signal, means for picking up elements of said portion, a plurality of switching means controlling the conduction of said elements each switching me... | 10/30/1979 |
| 4156314 | Rotors for a ciphering machine 1. In a cryptographing machine, a commutator comprising a disc of insulation having an axial opening therethrough and having a peripheral flange thereon, and having a plurality of slots formed in its inner surface, a plurality of contacts anchored in a ri... | 05/29/1979 |
| 4124311 | Mechanical movements for coding machines 1. A ciphering unit mechanism, comprising a rotatable cam sleeve provided th a plurality of cams, a clutch engageable to effect driving of said sleeve, a plurality of character keys, a swingable bail operable by all of said keys connected to release said ... | 11/07/1978 |
| 3984922 | Rotors 1. A cryptographic rotor including a first disc having an annular array of input contacts on one face thereof, a second disc having an annular array of output contacts on one face thereof, a plurality of wires connecting the input contacts to the output c... | 10/12/1976 |
