Message verification and transmission error detection by block chaining
US4074066A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 1976 |
| Grant date | Feb 14, 1978 |
| Priority date | — |
| Expiry date | Apr 26, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/0637
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
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 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.