| 5940002 |
Security system with random number remote communication |
| Aug-17-1999 |
A security system that is useful for protecting vehicles from theft and buildings from unauthorized entry, for example, includes utilizing random numbers within remotely transmitted signals. A remote signaling... |
| 5917914 |
DVD data descrambler for host interface and MPEG interface |
| Jun-29-1999 |
A descrambler for a Digital Versatile Disk (DVD) is provided within a DVD controller to allow for real-time descrambling of DVD data from the DVD buffer. The built-in descrambler also allows the controller... |
| 5881154 |
Data scramble transmission system |
| Mar-9-1999 |
A data scramble transmission system with a data transmission link coupled between sending and receiving ends is provided. The link adopts transmission frames each of which is constituted by data and control... |
| 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... |
| 5838794 |
Method and apparatus for inter-round mixing in iterated block substitution systems |
| Nov-17-1998 |
A method and apparatus for inter-round mixing in iterated block substitution systems is disclosed. The method involves optimizing inter-round mixing so that each sub-block of data affects each other in... |
| 5838796 |
Statistically optimized bit permutations in interated block substitution systems |
| Nov-17-1998 |
A method and apparatus for inter-round mixing in iterated block substitution systems is disclosed. The method involves optimizing inter-round mixing so that each data bit affects each other data bit in... |
| 5838795 |
Method and apparatus for statistical diffusion in iterated block substitution |
| Nov-17-1998 |
A method and apparatus for inter-round mixing in iterated block substitution systems is disclosed. The method involves optimizing inter-round mixing so that each sub-block of data affects each other in... |
| 5809148 |
Decryption of retransmitted data in an encrypted communication system |
| Sep-15-1998 |
The method generally includes the steps of receiving (201) a message (100) comprising a message indicator (101) and a plurality of encrypted blocks (103 through 111). When at least one block of the plurality... |
| 5802063 |
Conditional access filter as for a packet video signal inverse transport system |
| Sep-1-1998 |
Apparatus in a receiver, for processing transmitted entitlement control information, includes a packet transport processor for selecting signal packets having payloads containing a conditional access payload... |
| 5799090 |
pad encryption method and software |
| Aug-25-1998 |
A pad encryption software architecture includes space on a floppy for storing the pad to be used with the encryption software. The pad is XOR generated with random numbers subject to redetermined offsets.... |
| 5796836 |
Scalable key agile cryptography |
| Aug-18-1998 |
A system and method for encrypting blocks of plain text. Output FIFO memories are provided for decoupling pseudorandom vector generation from plain text encryption. The output FIFOs produce the effect... |
| 5790591 |
Spread spectrum transmitter and communications system using multiple spreading codes |
| Aug-4-1998 |
A spread spectrum transmitter for generating a plurality of spread spectrum codes comprises a shift register having a plurality of stages, with a plurality of tap sets connected to selected ones of said... |
| 5778074 |
Methods for generating variable S-boxes from arbitrary keys of arbitrary length including methods which allow rapid key changes |
| Jul-7-1998 |
A system for generating variable substitution boxes from arbitrary keys for use in a block cipher system utilizes an initial set of linearly independent numbers to generate substitution tables. The initial... |
| 5774065 |
Remote control system and method using variable ID code |
| Jun-30-1998 |
In a remote control system, each time a transmission code is transmitted, a rolling code having a prescribed bit configuration is cumulatively varied. An operation process is performed between each bit... |
| 5768390 |
Cryptographic system with masking |
| Jun-16-1998 |
A system for cryptographically transforming a sequence of input blocks of plaintext or ciphertext data into corresponding sequence of output blocks of data while providing enhanced protection against cryptographic... |
| 5765197 |
Method and system for authentication of a memory unit for a computer system |
| Jun-9-1998 |
A computer system for high-performance video and audio manipulations comprising a locked memory cartridge and an audio/video/compact disk (CD) drive controller/coprocessor. The computer system has a central... |
| 5757922 |
Method and system for packet scrambling communication with reduced processing overhead |
| May-26-1998 |
A packet scrambling communication scheme capable of reducing the processing amount and the processing time required for the scrambling processing and the descrambling processing at the transmitting side... |
| 5740249 |
Encryption apparatus and method capable of controlling encryption process in accordance with an internal state |
| Apr-14-1998 |
An encryption apparatus is constituted by a plurality of rungs of round functions. Each round function comprises internal state storing means for storing an internal state, internal state updating means... |
| 5724427 |
Method and apparatus for autokey rotor encryption |
| Mar-3-1998 |
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... |
| 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... |
| 5694473 |
Decryption of retransmitted data in an encrypted communication system |
| Dec-2-1997 |
A method of decrypting retransmitted parts of a message includes receiving (201) a message comprising encryption synchronization and a plurality of encrypted blocks. Until a first block of the plurality... |
| 5687238 |
Small size product cipher apparatus |
| Nov-11-1997 |
In a product cipher apparatus, a permutation is performed upon plaintext or ciphertext to generate a first message. At least two successive substitutions are performed upon the first message to generate... |
| 5684876 |
Apparatus and method for cipher stealing when encrypting MPEG transport packets |
| Nov-4-1997 |
A method of encrypting clear payload data to form encrypted payload data uses a block cipher, the block cipher being characterized by a predetermined block length. The method includes a step of parsing... |
| 5675653 |
Method and apparatus for digital encryption |
| Oct-7-1997 |
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... |
| 5649014 |
Pseudorandom composition-based cryptographic authentication process |
| Jul-15-1997 |
The pseudorandom process iteratively applies a selected CRC encryption process on the information to be encrypted. The encryption process is selected by testing one of the digits comprising the number... |
| 5640455 |
Secret-key enciphering method and arrangement therefor capable of preventing unfair acquirement of information |
| Jun-17-1997 |
ELT transformation circuits 101.sub.1 to 101.sub.m are preliminarily supplied with ELT transformation parameters a.sub.i, b.sub.i, and p.sub.i (i=1, 2, . . . , m). When a plaintext of n bits long is supplied... |
| 5623549 |
Cipher mechanisms with fencing and balanced block mixing |
| Apr-22-1997 |
An enhanced cryptographic mechanism employs Latin square derived balanced size-preserving block mixers and strong, practical fencing arrays of substitution mechanisms in combination with each other and... |
| 5619575 |
Pseudorandom composition-based cryptographic authentication process |
| Apr-8-1997 |
The pseudorandom process iteratively applies a selected CRC encryption process on the information to be encrypted. The encryption process is selected by testing one of the digits comprising the number... |
| 5617541 |
System for packetizing data encoded corresponding to priority levels where reconstructed data corresponds to fractionalized priority level and received fractionalized packets |
| Apr-1-1997 |
A data distribution system has a number of data processing devices interconnected by data transmission media. At least one of the data processing devices transmit data to other data processing devices... |
| 5606668 |
System for securing inbound and outbound data packet flow in a computer network |
| Feb-25-1997 |
A filter module allows controlling network security by specifying security rules for traffic in the network and accepting or dropping communication packets according to these security rules. A set of security... |
| 5606616 |
Cryptographic apparatus with double feedforward hash function |
| Feb-25-1997 |
Apparatus is provided for authenticating information using a double feedforward hash function to provide complementarity in the implementation of an encryption algorithm. A cryptographic processor has... |
| 5598428 |
DS/CDMA diversity receiver with despreading filters using combiner wherein first and second despreading filters are delayed with respect to each other by a period of half the chip rate |
| Jan-28-1997 |
A DS/CDMA receiver includes first and second diversity branches each including an antenna, a receiver and a despreading filter. The output signals of the transversal despreading filters of both diversity... |
| 5561714 |
Scrambling system for serial digital video |
| Oct-1-1996 |
An improved scrambler for serial digital video that is compatible with SMPTE Standard 259M inserts a detector/dithering circuit between the input serial digital signal and a scrambler. The scrambler's... |
| 5541995 |
Method and apparatus for decoding non-sequential data packets |
| Jul-30-1996 |
Data packets which have been sequentially encoded and transmitted, and are received out-of-sequence, are decoded, such that the proper sequence is restored. A receiving decoder is synchronized with a transmitting... |
| 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... |
| 5452358 |
Method and apparatus for improving the security of an electronic codebook encryption scheme utilizing a data dependent encryption function |
| Sep-19-1995 |
An apparatus and method for improving the security of an electronic codebook encryption scheme comprises a transmitter unit for encoding or encrypting data and a separate authorized receiver for decoding... |
| 5412728 |
Device for security protection of digital data using elementary instructions data processing |
| May-2-1995 |
The calculator (MCA) is suitable for carrying out a non reversible and quasi-random operation with two operands on the incoming set of the said operation. The controller (MCO) breaks down the data sequence... |
| 5396228 |
Methods and apparatus for compressing and decompressing paging data |
| Mar-7-1995 |
A system and method for encoding and decoding page messages includes an encoder for encoding and classifying each word of the page message. Words found in one of one or more word dictionaries are encoded... |
| 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... |
| 5351299 |
Apparatus and method for data encryption with block selection keys and data encryption keys |
| Sep-27-1994 |
Disclosed is a data encryption apparatus strong to differential cryptanalysis, which is now the most influential cryptanalysis method. According to the data encryption apparatus, input data is divided... |
| 5347650 |
Device for transforming a digital data sequence into a condensed digital data block using tables and logic operators |
| Sep-13-1994 |
An electronic device for processing digital data has an input for receiving data to be processed and processor means suitable for transforming the input data in non-falsifiable manner into a result condensed... |
| 5335280 |
Random sum cipher system and method |
| Aug-2-1994 |
A cipher system for use by a sender and receiver provides a plaintext alphabet, each character of which is coded by a numerical synonym, the set of numerical synonyms comprising a collection of non-negative... |
| 5321753 |
Secure communication of static information by electronic means |
| Jun-14-1994 |
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... |
| 5307412 |
Random coding cipher system and method |
| Apr-26-1994 |
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... |
| 5307409 |
Apparatus and method for fault detection on redundant signal lines via encryption |
| Apr-26-1994 |
A fault detection apparatus and method combines each of a plurality of redundant digital data signals with a unique key signal for transmission over one of a plurality of signal lines and recombines each... |
| 5301235 |
Arrangement for transforming plaintext into ciphertext for use in a data communications system |
| Apr-5-1994 |
A hardware arrangement is provided for transforming plaintext into corresponding ciphertext. The plaintext includes a plurality of words each having a predetermined bit length. The hardware arrangement... |
| 5301232 |
Method and apparatus for over-the-air programming of communication devices |
| Apr-5-1994 |
In a communication system (300), a controller interface (302) provides for monitoring of channel activity in order to determine communication devices (400) which are communicating using old encryption... |
| 5278902 |
Method and apparatus for transition direction coding |
| Jan-11-1994 |
The present invention provides a method and apparatus for encoding data in the context of a digital system for communicating binary information, including code words, over a communications channel. The... |
| 5239584 |
Method and apparatus for encryption/authentication of data in energy metering applications |
| Aug-24-1993 |
In one embodiment, the present invention is an encryption/decryption and authentication algorithm. The algorithm has three major steps. The first step is generating cipher text. The second step is generating... |
| 5233653 |
Apparatus and method for enciphered facsimile transmission and reception |
| Aug-3-1993 |
An enciphered facsimile apparatus in which encoded image data is fetched one block at a time, and chained encipherment is executed in a reverse direction, respectively. Upon completion of encipherment,... |
