Continuous synchronous encryption and decryption in a...

Details Continuous synchronous encryption and decryption in a... Continuous synchronous encryption and decryption in a...

H - Electricity

04

L

H04L 9/12 (2006.01) H04B 7/26 (2006.01) H04L 7/08 (2006.01) H04Q 7/22 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 2135913

In a wireless communication system comprising a plurality of fixed communication units (FCUs) (102) and portable communication units (PCUs) (120), each comprising an encryption synchronization counter (ESC) (314, 414), the PCU (120) and FCU (102) having a digital transmission format (201), a method of maintaining encryption and decryption throughout a hand-off is shown, comprising the steps of: (a) loading (708) during a hand-off initiation a continuation value for a second FCU ESC; and (b) incrementing (709) synchronously the second FCU ESC and the PCU ESC, starting from the continuation value and beginning at the time of hand-off completion.

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