Method and apparatus for transceiving cryptographically...

Details Method and apparatus for transceiving cryptographically... Method and apparatus for transceiving cryptographically...

H - Electricity

04

K

325/3, 354/47, 3

H04K 1/00 (2006.01)

Patent

CA 1258884

METHOD AND APPARATUS FOR TRANSCEIVING CRYPTOGRAPHICALLY ENCODED DIGITAL DATA ABSTRACT OF THE DISCLOSURE Method and apparatus are disclosed for transceiving digital control and cryptographically encoded data signals in a unique format. The format includes frame synchronization, cryptographic synchronization and selective signalling (addressing) information both in a preamble portion to an entire message and recurrently at regular intervals throughout a message of encrypted digital voice signals. This arrangement permits successful late entry and/or synchronization recovery (both frame and cryptographic synchronization recovery) in an addressable selective signalling type of private radio communication system even if such synchronization is never acquired from the preamble (e.g. because of a long radio transmission channel fade or the like) or in the event such synchronization is temporarily lost after the preamble has already occurred.

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