Encrypting and decrypting device which stores an algorithm in a

Details Encrypting and decrypting device which stores an algorithm in a Encrypting and decrypting device which stores an algorithm in a

1986-09-02

1988-07-12

Shaw, Gareth D.

Cryptography

Electric signal modification

Having production of printed copy

380 24, 380 28, 380 55, 364900, 235380, H04L 900, G06F 100, G06K 500

Patent

active

047575433

ABSTRACT:
A data processing terminal device is on-line connected to a host computer and records on journal paper journal data obtained as a result of communication with the host computer. Data is encrypted, and encrypted data is exchanged between the terminal device and the host computer. The encrypted journal data is printed together with the normal journal data on the journal paper. The algorithm used to encrypt the data is stored on an ic card issued to the user and updated periodically. By comparing the journal data with its encrypted data, journal data alteration can be easily detected.

REFERENCES:
patent: 4268715 (1981-05-01), Atalla
patent: 4277837 (1981-07-01), Stuckert
patent: 4355369 (1982-10-01), Garuin
patent: 4511970 (1985-04-01), Okano et al.
patent: 4578530 (1986-03-01), Zeidler
patent: 4675669 (1987-06-01), Goldman

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