Method of secure remote access

Details Method of secure remote access Method of secure remote access

1990-12-20

1992-09-01

Swann, Tod

Cryptography

Key management

Having particular key generator

380 25, 380 21, 34082531, H04L 902

Patent

active

051446677

ABSTRACT:
Access to a vehicle by a remote electronic key via a radio link is secured by an exchange of encrypted signals. A remote unit having a secret number is introduced to a base unit and a common key is agreed upon by an exponential key exchange. The common key is encrypted using the secret number and stored in the base unit. Thereafter, the base unit is able to authenticate the identity of the remote unit by sending the encrypted common key and a random number to the remote unit which decrypts the key and uses it to encrypt the random number. The random number is also encrypted in the base unit and compared with the encrypted random number from the remote unit.

REFERENCES:
patent: 3911397 (1975-10-01), Freeny, Jr.
patent: 4731840 (1988-03-01), Mniszewski et al.
patent: 4746788 (1988-05-01), Kawana
patent: 4799061 (1989-01-01), Abraham et al.
patent: 4864615 (1989-09-01), Bennett et al.
patent: 4942393 (1990-07-01), Waraksa et al.

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