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1. (US4074066) Message verification and transmission error detection by block chaining

المكتب : الولايات المتحدة الأمريكية
رقم الطلب: 05680404 تاريخ الطلب: 26.04.1976
رقم النشر: 4074066 تاريخ النشر: 14.02.1978
رقم التسليم: 4074066 تاريخ التسليم: 14.02.1978
نوع النشر: A
التصنيف الدولي للبراءات:
G09C 1/00
G06F 21/22
H04L 9/06
H04L 12/22
Description not available in lang arDescription not available in lang arDescription not available in lang arDescription not available in lang ar
المتقدمون: International Business Machines Corporation
المخترعون: Ehrsam William F.
Meyer Carl H. W.
Smith John L.
Tuchman Walter L.
الوكلاء: Lester Edwin
بيانات الأولوية:
العنوان: (EN) Message verification and transmission error detection by block chaining
الملخص: front page image
(EN)

A message transmission system for the secure transmission of multi-block data messages from a sending station to a receiving station. PAL 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 function 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.