| 7039185 |
Method and system for securing a printhead in a closed system metering device |
| May-2-2006 |
A closed system meter that secures the link between the accounting device and printer utilizing a Linear Feedback Shift Register (LFSR) based stream encryption is provided. The accounting device includes... |
| 7024560 |
Power-residue calculating unit using Montgomery algorithm |
| Apr-4-2006 |
A power-residue calculating circuit includes: an I/F (interface) circuit with respect to an external bus; an e register holding a key e; a Y register holding a multiplier Y for Montgomery conversion; an... |
| 7020281 |
Timing attack resistant cryptographic system |
| Mar-28-2006 |
A method for determining a result of a group operation performed an integral number of times on a selected element of the group, the method comprises the steps of representing the integral number as a... |
| 6980658 |
Method and apparatus for encrypting transmissions in a communication system |
| Dec-27-2005 |
Method and apparatus for encrypting transmission traffic at separate protocol layers L1, L2, and L3so that separate encryption elements can be assigned to separate types of transmission... |
| 6961427 |
Methods and apparatus for keystream generation |
| Nov-1-2005 |
Methods and apparatus for the generation of a cryptographic one way function (a key or keystream generator) for use in encrypting or decrypting binary data. A non-linear key or keystream generation algorithm... |
| 6943664 |
Process for controlling the resynchronization of a remote control with a changing code |
| Sep-13-2005 |
This process comprises the following steps: - detection of the need for resynchronization,
- identification of a desynchronized badge and memorization in a computer of a corresponding...
|
| 6895090 |
Pseudo-noise sequence with insertion having variant length and position |
| May-17-2005 |
An augmented pseudo-noise sequence (10) is generated from a two or more pseudo-noise sequences, using LFSRs or other such devices. A segment (16) of a one pseudo-noise sequence (14), having an arbitrary... |
| 6891952 |
Dynamic key generation and confidential synchronization of encryption components |
| May-10-2005 |
This invention report describes the architecture of a system, which undertakes in a new way the dynamic generation of symmetrical keys and the confidential synchronization of encryption components which... |
| 6785389 |
System for bitstream generation |
| Aug-31-2004 |
A bitstream generator including a plurality of linear feed shift registers (LFSRs) operative to generate a bit stream and including: at least a first LFSR operative, when assigned as a generator during... |
| 6778670 |
Method and apparatus for encryption and decryption |
| Aug-17-2004 |
A method and apparatus are provided for encrypting a stream of data transmitted within a frame. The method includes determining a first initialization state in a first preselected interval, and determining... |
| 6754824 |
Modulated message authentication system and method |
| Jun-22-2004 |
A telecommunications system and method is disclosed for implementing a message authentication code (MAC) for transmitted digital information signals. Digital information signals typically include an error... |
| 6754345 |
Pseudorandom number generation circuit and data communication system employing the same |
| Jun-22-2004 |
A pseudorandom number generation circuit 2 whose generation timings of pseudorandom numbers vary randomly is disclosed. The pseudorandom number generation circuit 2 includes a clock generation circuit... |
| 6707914 |
System and method for encrypting information within a communications network |
| Mar-16-2004 |
Within a communications system, first and second end stations coupled to a network participate in a communications session with one another using the network. Each end station includes an encryptor having... |
| 6522749 |
Quantum cryptographic communication channel based on quantum coherence |
| Feb-18-2003 |
A quantum cryptographic communication channel having: a light source; a reflector; first and second sources each capable of generating a pair of photons emitted in the form of signal and idler light beams... |
| 6490357 |
Method and apparatus for generating encryption stream ciphers |
| Dec-3-2002 |
A method and an apparatus for generating encryption stream ciphers are based on a recurrence relation designed to operate over finite fields larger than GF(2). A non-linear output can be obtained by using... |
| 6373951 |
Synchronization technique and method and apparatus for transmitting and receiving coded signals |
| Apr-16-2002 |
To transmit encoded information such as for example voice messages between remote transceivers, a transmitter digitizes and encodes an audio signal and then transmits the resulting digital coded signal... |
| 6356637 |
Field programmable gate arrays |
| Mar-12-2002 |
A volatile field programmable gate array (FPGA) having a configurable logical structure portion that is configurable with encrypted configuration data stored external to the FPGA in configuration data... |
| 6324288 |
Cipher core in a content protection system |
| Nov-27-2001 |
A cipher system having a cipher core to encrypt plaintext data into ciphertext data, and a bus interface coupled to the cipher core to transfer the ciphertext data to a bus. In one embodiment, the cipher... |
| 6282291 |
Method and apparatus for encrypting input bit sequence |
| Aug-28-2001 |
An output bit sequences is derived from an initial bit sequence and this output bit sequence is used to encrypt an input bit sequence in a first mode of operation or not to so encrypt the input bit sequence... |
| 6263082 |
Pseudorandom number generation circuit and data communication system employing the same |
| Jul-17-2001 |
A pseudorandom number generation circuit 2 whose generation timings of pseudorandom numbers vary randomly is disclosed. The pseudorandom number generation circuit 2 includes a clock generation circuit... |
| 6201870 |
Pseudorandom noise sequence generator |
| Mar-13-2001 |
A pseudorandom sequence generator including a first feedback shift register having at least one input and at least one output and a first controller having an output in communication with the at least... |
| 6151393 |
Device and method for modular multiplication |
| Nov-21-2000 |
A method and apparatus are disclosed for performing modular multiplication. Modular multiplication in accordance with the present invention includes precalculating a 2's complement of a given modulus and... |
| 6125183 |
Cryptosystem for optical storage |
| Sep-26-2000 |
A method of encrypting and decrypting digital data such as text, numeric, images, pictures, especially tailored for optical compact discs; said method comprising of ciphering/deciphering and error detection... |
| 6097815 |
Method of and an apparatus for generating pseudo-random numbers |
| Aug-1-2000 |
To provide an apparatus for generating pseudo-random numbers at a high speed with sufficient cryptographical security, the apparatus comprises: a T-ary counter (101) for generating a count number from... |
| 6064740 |
Method and apparatus for masking modulo exponentiation calculations in an integrated circuit |
| May-16-2000 |
Circuitry which performs modular mathematics to solve the equation C=M.sup.k mod n and n is performed in a manner to mask the exponent k's signature from timing or power monitoring attacks. The modular... |
| 6049608 |
Variable length nonlinear feedback shift registers with dynamically allocated taps |
| Apr-11-2000 |
A new class of variable length, nonlinear feedback shift registers (NLFSR's) is disclosed that uses data-dependent dynamically allocated taps to filter digital information reversibly, flexibly, and rapidly.... |
| 6009135 |
Method and apparatus for generating a stream cipher |
| Dec-28-1999 |
A code division multiple access (CDMA) is a type of spread-spectrum communication system having a plurality of subscriber units and at least one base station. In order for a first subscriber unit to communicate... |
| 5978486 |
Data scrambling method, data scrambling apparatus, data descrambling method, and data descrambling apparatus |
| Nov-2-1999 |
A data scrambling method, defined by data polynomial, D(X)=d.sub.n X.sup.n +d.sub.n-1 X.sup.n-1 +d.sub.n-2 X.sup.n-2 + . . . +d.sub.2 X.sup.2 +d.sub.1 X.sup.1 +d.sub.0 X.sup.0 generating polynomial, G(X)=1+g.sub.-1... |
| 5970148 |
Low cost encryption transponder |
| Oct-19-1999 |
Novel means of achieving increased security while still obtaining a low cost, manufacturable device are disclosed and claimed. The first mode of operation is the learn mode which provides means for initial... |
| 5966447 |
Data scrambling method, data scrambling apparatus, data descrambling method, and data descrambling apparatus |
| Oct-12-1999 |
A method and apparatus for descrambling data that is characterized by shift registers that realize an operation of generating polynomial and that have a ring-shaped structure that realizes plural and continuous... |
| 5910907 |
Shift register based pseudorandom number generator |
| Jun-8-1999 |
An apparatus for, and method of, generating a k-bit pseudorandom number using m storage devices, m being less than k, is provided. The apparatus has interconnections among the storage devices. The interconnections... |
| 5881153 |
Remote keyless entry encryption algorithm |
| Mar-9-1999 |
The present invention teaches a method and system of encrypting a set of data having a test bit. The method comprises the step of generating a first and a second data string from the set of data. Once... |
| 5859912 |
Digital information privacy system |
| Jan-12-1999 |
A system for determining a maximum length digital sequence is constructed by selecting a Mersenne Prime integer and a primitive polynomial having an ORDER equal to the Mersenne Prime integer. An arbitrarily... |
| 5818940 |
Switching matrix |
| Oct-6-1998 |
A deciphering unit having input and output matrices connected to a master ift register to permit flexible access to its stages. The output matrix allows selection of four register positions in the master... |
| 5799089 |
System and apparatus for blockwise encryption/decryption of data |
| Aug-25-1998 |
A system for encrypting and decrypting digital data wherein the data is divided in packets of N blocks X(1) . . . X(N) of 2.sup.m bits, comprises an encryption device and a decryption device. The encryption... |
| 5796827 |
System and method for near-field human-body coupling for encrypted communication with identification cards |
| Aug-18-1998 |
An apparatus and method are disclosed for encoding and transferring data from a transmitter to a receiver, using the human body as a transmission medium. The transmitter includes an electric field generator,... |
| 5790666 |
Decryptor |
| Aug-4-1998 |
A decryptor includes a descrambler for descrambling the scrambled signals using a PN signal, a PN generator which shifts the state successively from its initial state setup by a scramble-key, generates... |
| 5760700 |
Security system with succession of codes |
| Jun-2-1998 |
The security system involved in the arming and disarming of a car alarm, includes a transmitter and a receiver. Both transmitter and receiver includes oscillators incorporating a highly accurate and stable... |
| 5717760 |
Message protection system and method |
| Feb-10-1998 |
An encryption/decryption apparatus that provides at least two masks, each of which is used in logic/mathematic operation with information to be encrypted to preserve confidentiality. The operations include... |
| 5613005 |
Cipher communication method and device |
| Mar-18-1997 |
Self-synchronizing encryption/decoding circuits are provided with a plurality of irreducible polynomials. An irreducible polynomial to be used in encryption between sending and receiving stations is selected... |
| 5608802 |
Data ciphering device |
| Mar-4-1997 |
A data ciphering device that has special application in implementing the Digital European Cordless Telephone (DECT) standard data ciphering algorithm which requires a lengthy procedure of key loading and... |
| 5606322 |
Divergent code generator and method |
| Feb-25-1997 |
A method and corresponding apparatus (10) for generating a pseudo-random number. The method has steps of generating a first bit stream from a number generator (16, 35), combining a predetermined number... |
| 5513245 |
Automatic generation of private authentication key for wireless communication systems |
| Apr-30-1996 |
Apparatus and method for automatically generating an authentication key (A-Key) in a mobile station wherein the mobile station periodically receives random numbers from a base station, and automatically... |
| 5500899 |
Secure voice conferencing apparatus |
| Mar-19-1996 |
A system for communicating simultaneous encrypted messages in a jamming eronment with a low opportunity for depth exploitation. The system includes a plurality of transmitters, each having a high speed... |
| 5500898 |
Scramble communication system multiplexing/demultiplexing scramble generation polynomial |
| Mar-19-1996 |
A scramble communication system comprises a station and a plurality of terminals connected to the station. The respective terminals are previously provided with specific scramble generation polynomials... |
| 5365588 |
High speed encryption system and method |
| Nov-15-1994 |
A general purpose, high-speed encryption system and method, based on a linear feedback shift register (LFSR) that provides inputs to one or more mathematically independent nonlinear output functions, resulting... |
| 5365585 |
Method and apparatus for encryption having a feedback register with selectable taps |
| Nov-15-1994 |
A method and apparatus for generating a pseudo-random bit sequence is provided. A first input bit is determined as a function of bits stored in a shift register in accordance with a first feedback algorithm.... |
| 5355415 |
Parallel distributed sample scrambling system |
| Oct-11-1994 |
A parallel distributed sample scrambling and descrambling system for fixed-sized packet transmission comprising a parallel scrambler and a parallel descrambler. The scrambler includes; a parallel shift... |
| 5195136 |
Method and apparatus for data encryption or decryption |
| Mar-16-1993 |
A cryptographic apparatus comprises a linear feedback shift register for providing a pseudo-random code, coupled to a ciphering device, which is in turn coupled to an adder. The ciphering device encrypts... |
| 5191610 |
Remote operating system having secure communication of encoded messages and automatic re-synchronization |
| Mar-2-1993 |
A remote operating system for remote-controlled operation of a device provides secure communication of encoded messages between a transmitter (100) and receiver (150) of the system, and provides automatic... |
