User authentication system

Details User authentication system User authentication system

G - Physics

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G06F 1/00 (2006.01) G06F 21/00 (2006.01) G07F 7/10 (2006.01) H04L 9/00 (2006.01)

Patent

CA 1222296

-11- ABSTRACT USER AUTHENTICATION SYSTEM Disclosed is a system which employs a pair of encryption functions f and g in the "log on" protocol of a computer dial-up arrangement. The functions are inverses of each other and, hence, a random sequence when encrypted with f and then with g results in the original sequence. When a user wishes to "log on" the computer selects a random sequence and forms a challenge sequence. The user encrypts the challenge sequence with the function g and thus forms a response sequence. Encryption with the function f by the computer permits verification of the response sequence. The secrecy of the user's function is maintained by providing the user with an authenticating device having only two ports: a power port and an I/O port. The I/O port is connected to a microprocessor which accesses a memory that contains the secret encryption function g.

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