Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1992-02-28
1993-03-02
Cangialosi, Salvatore
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 23, 380 25, 380 46, 380 48, 380 50, H04L 900
Patent
active
051916100
ABSTRACT:
A remote operating system for remote-controlled operation of a device provides secure communication of encoded messages between a transmitter (100) and receiver (150) of the system, and provides automatic re-synchronization of the transmitter and receiver without revealing a loss of synchronization to the operator. A pseudo random binary number (PRBN) generator (105) in the transmitter (100) produces a sequence of identification numbers. Each time the transmitter (100) is activated, the identification number contained in the transmitted encoded message is selected as the next number in the sequence of identification numbers. A PRBN generator (170) in the receiver (150) produces a sequence of reference numbers that is identical to the sequence of identification numbers. The receiver responds to a command code portion of the transmitted encoded message for operation the device when there is identity between the reference number and the identification number. The receiver (150) responds to the transmitted message when there is not identity between the reference number and the identification number provided that a reference number identical to the identification number is generated within a search length in the sequence of reference numbers, thereby providing automatic re-synchronization of the transmitter and receiver. If a reference number matching the identification number is not found within the search length, the transmitter is controlled to produce a re-synchronization signal for re-synchronizing the receiver to the transmitter.
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Finn Alan M.
Hill John P.
Cangialosi Salvatore
Grillo Michael
United Technologies Automotive Inc.
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