H - Electricity – 04 – L
Patent
H - Electricity
04
L
340/70
H04L 9/06 (2006.01)
Patent
CA 1100588
MESSAGE VERIFICATION AND TRANSMISSION ERROR DETECTION BY BLOCK CHAINING ABSTRACT OF THE DISCLOSURE A message transmission system for the secure transmis- sion of multi-block data messages from a sending station to a receiving station. The sending station contains cryptographic apparatus operative in successive cycles of operation during each of which an input block of clear data bits is ciphered under control of an input set of cipher key bits to generate an output block of ciphered data bits for transmission to the receiving station. Included in the cryptographic apparatus of the sending station is means providing one of the inputs for each succeeding ciphering cycle of operation as a func- tion of each preceding ciphering cycle of operation. As a result, each succeeding output block of ciphered data bits is effectively chained to all preceding cycles of operation of the cryptographic apparatus of the sending station and is a function of the corresponding input block of clear data -bits, all preceding input blocks of clear data bits and the initial input set of cipher key bits. KI9-74-013
275390
Ehrsam William F.
Meyer Carl H.
Smith John L.
Tuchman Walter L.
International Business Machines Corporation
Na
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