04453074 is referenced by 384 patents and cites 1 patents.

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.

Title
Protection system for intelligent cards
Application Number
6/312705
Publication Number
4453074
Application Date
October 19, 1981
Publication Date
June 5, 1984
Inventor
Stephen B Weinstein
Summit
NJ, US
Agent
Gottlieb Rackman and Reisman
Assignee
American Express Company
NY, US
IPC
G06K 5/00
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