Matches 1 - 45 out of 45
Match Document Document Title
7127580 Apparatus and method for controlling data access using encrypted link position information  
An access restriction apparatus, an access restriction method, a computer readable program storage medium having a recorded access restriction program, and the access restriction program, all...
6751319 Block cipher method  
A data encryption system for encrypting an n-bit block of input in a plurality of rounds is presented, where n is preferably 128 bits or more. The data encryption system includes a computing unit...
6578150 Block cipher method  
A data encryption system for encrypting an n-bit block of input in a plurality of rounds is presented, where n is preferably 128 bits or more. The data encryption system includes a computing unit...
6330678 ***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST***
Block cipher method  
A data encryption system for encrypting an n-bit block of input in a plurality of rounds is presented, where n is preferably 128 bits or more. The data encryption system includes a computing unit...
6249582 Apparatus for and method of overhead reduction in a block cipher  
An apparatus and method for reducing the overhead of a block cipher includes shortening the length of the initialization vector so that its length is less than the length of each block of...
6240513 Network security device  
A network security device is connected between a protected client and a network. The network security device negotiates a session key with any other protected client. Then, all communications...
6215876 Apparatus for and method of detecting initialization vector errors and maintaining cryptographic synchronization without substantial increase in overhead  
An apparatus and method for detecting erroneous initialization vectors transmitted over a communications channel and maintaining cryptographic synchronization by comparing a received vector with a...
6199162 Block cipher method  
A data encryption system for encrypting an n-bit block of input in a plurality of rounds is presented, where n is preferably 128 bits or more. The data encryption system includes a computing unit...
6182216 Block cipher method  
A data encryption system for encrypting an n-bit block of input in a plurality of rounds is presented, where n is preferably 128 bits or more. The data encryption system includes a computing unit...
6151679 System and method for preventing a first node from being emulated by another node  
A network security device 10 is connected between a protected client 12 and a network 100. The network security device 10 negotiates a session key with any other protected client. Then, all...
6128387 Method and system for using a non-inversible transform and dynamic keys to protect firmware  
The present invention discloses a method and system to encrypt an object code using a non-inversible transform and dynamic keys in an encryption circuit and an decryption circuit. The encryption...
5887243 Signal processing apparatus and methods  
A unified system of programing communication. The system encompasses the prior art (television, radio, broadcast hardcopy, computer communications, etc.) and new user specific mass media. Within...
5835599 Muti-cycle non-parallel data encryption engine  
A multi-cycle, non-parallel DES encryption scheme that supports CBC, OFB, CFB, and ECB modes of operation. Three independent cipher stages are coupled together in series in order to implement a...
5809147 Device for cryptographically processing data packets and method of generating cryptographic processing data  
A device for encrypting or decrypting data packets. The device includes two cryptographic elements. The first cryptographic element generates processing data, based on a first starting value, for...
5796836 Scalable key agile cryptography  
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...
5757924 Network security device which performs MAC address translation without affecting the IP address  
A network security device is connected between a protected client and a network. The network security device negotiates a session key with any other protected client. Then, all communications...
5638512 Ring network security system with encoding of data entering a subnetwork and decoding of data leaving the subnet work  
A system for securing communications between devices connected to a ring network. In accordance with the present invention, when a message frame is passed around the ring network, a gate keeper...
5495580 Ring network security system with encoding of data entering a subnetwork and decoding of data leaving a subnetwork  
A system for securing communications between devices connected to a ring network. In accordance with the present invention, when a message frame is passed around the ring network, a gate keeper...
5483598 Message encryption using a hash function  
An encryption system employing a one-time key-pad uses a shared secret number and a one-way hash function with which both the originator and recipient of a message generate successive segments of a...
5444782 Computer network encryption/decryption device  
A computer network encryption/decryption device includes at least one microprocessor, microprocessor support hardware, at least two network ports for connecting to upstream and downstream networks,...
5442708 Computer network encryption/decryption device  
A computer network encryption/decryption device includes at least one microprocessor, microprocessor support hardware, at least two network ports for connecting to upstream and downstream networks,...
5335277 Signal processing appparatus and methods  
A unified system of programing communication. The system encompasses the prior art (television, radio, broadcast hardcopy, computer communications, etc.) and new user specific mass media. Within...
EP0289086B1 A method of and arrangement for digital signal encryption  
5231662 Method and device for enciphering data to be transferred and for deciphering the enciphered data, and a computer system comprising such a device  
Method and device for enciphering data words of a word width of n bits, in particular data words to be written in a computer storage, wherein a product cipher circuit comprises alternately one from...
5150401 Retrofittable encryption/decryption apparatus using modified frequency modulation  
A communication system for providing secured communication over a communication channel. The system includes a DES encryption device and a DES decryption device retrofittable into or within a...
5003596 Method of cryptographically transforming electronic digital data from one form to another  
A cryptographic system creates a key table from a single key such that the relationship between the keys in the key table cannot be determined even if the system implementation is known. The system...
4935961 Method and apparatus for the generation and synchronization of cryptographic keys  
A method and apparatus for generating cryptographic keys for a postal manifest and for synchronizing cryptographic keys for transmitting postal data securely on a communication link is presented....
4910777 Packet switching architecture providing encryption across packets  
Apparatus for preventing the unauthorized detection of the start and end of packets being communicated within a packet switching system. The packet switching system comprises a plurality of packet...
4907275 Encryption apparatus  
In an encryption apparatus, prior to encryption process, information indicating whether plain text blocks are to be encrypted or not is stored in a mask register, and the number of blocks of the...
4835713 Postage meter with coded graphic information in the indicia  
A postage meter is disclosed in which security information is encoded in the printed indicia. The information is encoded in a binary format which is transformed in a predetermined manner such that...
4802217 Method and apparatus for securing access to a computer facility  
A security unit is disclosed for controlling access to a main computer system. The security unit provides a comprehensive mechanism for detecting and inhibiting sophisticated attackers. A method of...
EP0289086A2 A method of and arrangement for digital signal encryption.  
An improved arrangement for digital signal encryption using a cipher algorithm in which a multi-bit key signal (K) is used to produce a first keystream signal (Ks1) of coding bytes which are used...
4776011 Recursive key schedule cryptographic system  
An encryption system in which a code word is processed, byte by byte, by a Vernan type process followed by non-linear encryption techniques, all of which are repeated several times, to generate a...
4642793 Many-to-one mapping hash address generator  
A data transformation circuit transforms an input data value into an output value according to a many-to-one mapping scheme by utilizing a hash coding circuit (30) which combines the input data...
4613901 Signal encryption and distribution system for controlling scrambling and selective remote descrambling of television signals  
A system and method for scrambling and selectively descrambling television signals that are transmitted to subscribers' descramblers in a subscription television system. A working key signal is...
4543559 Generator of encoding or decoding 8-bit bytes which can be used in a video system  
The generator comprises three subassemblies, each comprising an adder and registers, said three subassemblies making it possible to provide three recursive sequences. Each sequence is dependent on...
4434323 Scrambler key code synchronizer  
A method for synchronizing the scrambling sequences of communicating scrambler units of a privacy communications system in a reliable and secure manner. The method is particularly adapted for use...
4423287 End-to-end encryption system and method of operation  
An efficient end-to-end encryption system including key management procedures for providing secure, financial data communication between a system user at one of a plurality of transaction terminals...
4417338 Cryptographic key sharing circuit and method using code correction  
A circuit and method for sharing a key among n individuals by distributing a secondary key to each of the n individuals such that only k of the n secondary keys are required in order to reconstruct...
EP0083998A1 Scramble or unscramble byte generator  
Abstract not available for EP0083998 Abstract of corresponding document: US4543559 The generator comprises three subassemblies, each comprising an adder and registers, said three subassemblies...
4369332 Key variable generator for an encryption/decryption device  
An apparatus and method for generating a unique working key variable for controlling the operation of an encryption/decryption device during each user specified time period. The apparatus generates...
4349695 Recipient and message authentication method and system  
The specification discloses a system and method for authenticating a message recipient prior to transmission of a message and for authenticating the message content after receipt of the message. A...
4322577 Cryptosystem  
Encryption and decryption of information of a message is performed by partitioning a plaintext message into blocks of binary digits and by further partitioning said blocks into subblocks which are...
4322576 Message format for secure communication over data links  
Communication over data links using binary synchronous protocol that is to be made secure according to the Federal data encryption standard (DES) is enhanced by utilizing an encrypted message...
4249180 Past dependent microcomputer cipher apparatus  
Apparatus for use in a secure data communication system includes a microcomputer that controls a cipher process by which sensitive data is encrypted before transmission. When activated, the...
Matches 1 - 45 out of 45