Method and apparatus for synchronizing generation of separate, free running, time dependent equipment
Patent 4885778 Issued on December 5, 1989. Estimated Expiration Date: 
December 5, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 5, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3764742 3789653 3806874 3886451 3900867 Transmit phase control system of synchronization burst for SDMA/TDMA satellite communication system Asynchronous digital locking system Method of and means for processing an audio frequency signal to conceal intelligility Method and apparatus for ciphering and deciphering messages Method and apparatus for synchronizing the ciphering and deciphering of binary-coded messages InventorApplicationNo. 802579 filed on 11/27/1985US Classes:713/184, PIN/password generator device235/382, Permitting access340/5.54, Password340/5.6, Coded record input (e.g., IC card or key)380/28, PARTICULAR ALGORITHMIC FUNCTION ENCODING713/194Tamper resistantExaminersPrimary: Buczinski, Stephen C.Assistant: Gregory, Bernarr E. Attorney, Agent or FirmForeign Patent References
International ClassH04L 009/00AbstractAn apparatus and method for synchronizing the time definition of the dynamic variables by (a) calculating a first non-predictable code according to a secret predetermined algorithm, the algorithm generating the first non-predictable code on the basis of a first dynamic variable and a unique static variable; (b) automatically defining the first dynamic according to a first interval in which the static variable is input into the algorithm, the first interval of time having a predetermined duration; (c) calculating two or more second non-predictable codes according to the predetermined algorithm, the algorithm generating the second non-predictable codes on the basis of the two or more second dynamic variables and the unique static variable, (d) automatically defining the two or more second dynamic variables according to two or more cells of a second interval of time in which the static variable is input into the algorithm of the second computer, the second interval of time comprising a central cell of time having a predetermined duration and one or more cells of time bordering the central cell of time, each bordering cell of time having a predetermined duration; (e) comparing the first non-predictable code with the second non-predictable codes to determine a match, and (f) automatically synchronizing the clock mechanisms which define the first and second dynamic variables upon comparison and matching of the first non-predictable code with one of the second non-predictable codes.Other References
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