| 4195200 |
Key controlled block-cipher cryptographic system employing a multidirectional shift matrix |
| Mar-25-1980 |
A cryptographic system for enciphering a block of binary data under the control of a unique key consisting of a set of binary symbols. A clear message represented in binary data format is transformed into... |
| 4177355 |
Array device for data scrambling |
| Dec-4-1979 |
This specification describes an array logic chip that can be used to encipher and decipher binary data. The array logic chip contains a matrix of input and output lines with the input lines divided into... |
| 4168396 |
Microprocessor for executing enciphered programs |
| Sep-18-1979 |
A microprocessor for executing computer programs which have been enciphered during manufacture to deter the execution of the programs in unauthorized computers. This microprocessor deciphers and executes... |
| 4160123 |
Methods of and apparatus for the encoded transmission of information |
| Jul-3-1979 |
Method and apparatus for encoding transmitted data and decoding the data at a receiving facility. The data is divided into elements of equal length. Each element is assigned an age number having a value... |
| 4160120 |
Link encryption device |
| Jul-3-1979 |
An apparatus for insertion in a communications line for providing both message integrity and message secrecy within a significant portion of existing communications networks. At the transmitter end, the... |
| 4157454 |
Method and system for machine enciphering and deciphering |
| Jun-5-1979 |
Variable length data words are processed segment-by-segment together with corresponding segments of an enciphering key. As a function of the contents of a data segment, one of several modification modes... |
| 4107458 |
Cipher computer and cryptographic system |
| Aug-15-1978 |
A system for the protection of stored and transmitted data including a random access memory accessed by counters and used for encrypting and decrypting signals in a cryptographic system using stream and... |
| 4078152 |
Block-cipher cryptographic system with chaining |
| Mar-7-1978 |
A Block-Cipher Cryptographic System utilizing a unique user supplied key to control the cryptographic function and including means for modifying an input data block prior to performing a key-controlled... |
| 4074066 |
Message verification and transmission error detection by block chaining |
| Feb-14-1978 |
A message transmission system for the secure transmission of multi-block data messages from a sending station to a receiving station. The sending station contains cryptographic apparatus operative in successive... |
| 3962539 |
Product block cipher system for data security |
| Jun-8-1976 |
A device for ciphering a block of data bits under control of a cipher key. The cipher device performs a ciphering process for the block of data by carrying out an operation in which the block of data bits... |
| 3958081 |
Block cipher system for data security |
| May-18-1976 |
A device for ciphering message blocks of data bits under control of a cipher key. The cipher device performs an enciphering process for each message block of data by carrying out a predetermined number... |
