Protection system for intelligent cards
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United States of America Patent
Stats
-
Jun 5, 1984
Grant Date -
N/A
app pub date -
Oct 19, 1981
filing date -
Oct 19, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
There is disclosed a protection system for intelligent cards. Each card has stored in it a code which is the encryption of a concatenation of a user secret password and a common reference text. The encryption is derived by an initialization terminal which uses the private key associated with the public key of a public-key cryptosystem key pair. Each transaction terminal with which a card is used decrypts the stored code in accordance with the public key. A transaction is effected only if the stored code decrypts into the user password which is inputted on a keyboard and the common reference text.
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