Data exchange system comprising a plurality of user terminals ea

Details Data exchange system comprising a plurality of user terminals ea Data exchange system comprising a plurality of user terminals ea

1988-03-04

1990-08-21

Heckler, Thomas M.

Boots, shoes, and leggings

36494971, 3649278, 3649428, 36496576, G06F 300

Patent

active

049512471

ABSTRACT:
A secret cipher (Ki) that is the same for all user terminals is formed of two sub-components (KTi, KT'i) whereof the one sub-component (KTi) is deposited in an erasable, programmable read-only memory (EEPROM). For the second sub-component (KT'i), an encoded data block (E(KT'i)) is transmitted from the outside to a decoder means (DEC) provided in the security module, the decoded output signal thereof being deposited as second sub-component (KT'i) in a first sub-area of a write-read memory (RAM) present in the security module of the user terminal. An overall cipher (Ki) is calculated from the two sub-components (KTi, KT'i) and the result is deposited in a second sub-area of the write-read memory (RAM).

REFERENCES:
patent: 4224666 (1980-09-01), Giraud
patent: 4295039 (1981-10-01), Stuckert
patent: 4679236 (1987-07-01), Davies
patent: 4746788 (1988-05-01), Kawana
patent: 4786790 (1988-11-01), Kruse et al.
patent: 4819204 (1989-04-01), Schrenk

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