Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1993-11-05
1994-11-29
Swann, Tod R.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 48, 34082556, 34082569, H04K 100
Patent
active
053697065
ABSTRACT:
Secret Information is stored in the transmitter and receiver of the keyless entry system. The information includes a resynchronization authorization code. When resynchronization is requested by the user pressing the appropriate key fob button, a random number is generated in the transmitter and sent to the receiver along with the resynchronization authorization code. The receiver tests the authorization code received with its stored code. If the codes match, the receiver substitutes the random number received from the transmitter for its existing stored access code, thereby placing the transmitter and receiver back in synchronization.
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Swann Tod R.
United Technologies Automotive Inc.
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