User authentication system employing encryption functions

Details User authentication system employing encryption functions User authentication system employing encryption functions

1983-07-11

1986-05-20

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

178 2208, 235379, H04Q 900, H04L 900, G06K 500

Patent

active

045904707

ABSTRACT:
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.

REFERENCES:
patent: 3806874 (1974-04-01), Ehrat
patent: 4105156 (1978-08-01), Dethloff
patent: 4281215 (1981-07-01), Atalla
patent: 4297569 (1981-10-01), Flies
patent: 4349695 (1982-09-01), Morgan et al.
patent: 4438824 (1984-03-01), Mueller-Schloer
patent: 4467139 (1984-08-01), Mollier
"Data-Encryption `Box` Secures Comm Systems Easily", K. Cohen et al., Electronics Design, Apr. 16, 1981, vol. 29, No. 8, pp. 159-163.
Conference Record of Eascon, 1982 "Personal Authentication System for Access Control to the Defense Data Network," S. T. Kent, et al., pp. 89-93.
Communications of the ACM, vol. 24, No. 11, Nov., 1981 "Password Authentication with Insecure Communication," L. Lamport, pp. 770-772.

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