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

Office : United States of America
Application Number: 05680404 Application Date: 26.04.1976
Publication Number: 4074066 Publication Date: 14.02.1978
Grant Number: 4074066 Grant Date: 14.02.1978
Publication Kind : A
IPC:
G09C 1/00
G06F 21/22
H04L 9/06
H04L 12/22
G PHYSICS
09
EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
C
CIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY
1
Apparatus or methods whereby a given sequence of signs, e.g. an intelligible text, is transformed into an unintelligible sequence of signs by transposing the signs or groups of signs or by replacing them by others according to a predetermined system
G PHYSICS
06
COMPUTING; CALCULATING; COUNTING
F
ELECTRIC DIGITAL DATA PROCESSING
21
Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
22
by restricting access to, or manipulation of, programmes or processes
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
L
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9
Arrangements for secret or secure communication
06
the encryption apparatus using shift registers or memories for blockwise coding, e.g. D.E.S. systems
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
L
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
12
Data switching networks
02
Details
22
Arrangements for preventing the taking of data from a data transmission channel without authorisation
Applicants: International Business Machines Corporation
Inventors: Ehrsam William F.
Meyer Carl H. W.
Smith John L.
Tuchman Walter L.
Agents: Lester Edwin
Priority Data:
Title: (EN) Message verification and transmission error detection by block chaining
Abstract: 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.