Encipher-decipher device

Details Encipher-decipher device Encipher-decipher device

H - Electricity

04

L

340/70

H04L 9/00 (2006.01) G06F 7/58 (2006.01) H04L 9/18 (2006.01)

Patent

CA 1138069

7-12092/GTN 438 An encipher-decipher device Abstract of the disclosure An encipher-decipher apparatus including an input keyboard and a processing and control stage which enciphers or deciphers data re- ceived directly from the keyboard or preferably from a text store with the aid of a cipher generator. The cipher generator produces a cipher sequence dependent on two code data items that determine the initial state of the cipher generator. One item for encryption is supplied as a set of random code characters from a random generator. The random generator comprises a continually cycled modulo-n counter and a FIFO memory into which the instantaneous state of the counter is entered at each of successive actuations of keys of the keyboard, such key opera- tions being those done in any event in the use of the apparatus. The cycle time of the counter is much less than the time between consecu- tive key operations. A clock rate of 100 kHz is suggested. The set of characters is read out of the FIFO store at the start of data process- ing for use by the cipher generator.

338624

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