Encrypting and decrypting device which stores an algorithm in a memory
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United States of America Patent
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Jul 12, 1988
Issued Date -
N/A
app pub date -
Sep 2, 1986
filing date -
Feb 9, 1984
priority date (Note) -
Expired
status (Latency Note)
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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.
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