Cryptography – Communication system using cryptography – Wireless communication
Reexamination Certificate
2006-08-22
2006-08-22
Moise, Emmanuel L. (Department: 2137)
Cryptography
Communication system using cryptography
Wireless communication
C380S270000, C713S375000, C370S324000
Reexamination Certificate
active
07095856
ABSTRACT:
Encryption synchronization (e-sync) is maintained between a transmitter (104) and one or more receivers (102) in a multi-modulation TDM system (100) where information is communicated in slots (402) comprising a slot header (404) and one or more data blocks (406), and wherein the data blocks are eligible to be encoded at different modulation rates thereby creating a likelihood of different numbers of blocks in different slots. The receiver and transmitter employ respective encryption elements (200, 300) comprising e-sync shifter elements (202, 302) and encryption algorithm blocks (204, 304). The e-sync shifter element provides an e-sync signal defining an encryption state vector to the encryption algorithm block and is operable to advance the encryption state vector (in the case of the receiver) according to a number of received bits plus a variable number of bits. The variable number depends on the number of bits within a block, the maximum number of blocks that could be within a slot and the actual number of blocks within the slot.
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Conrad Alan
Logalbo Robert D.
Stogner Darrell
Davis Valerie M.
Moise Emmanuel L.
Motorola Inc.
Nguyen Minh Dieu
Santema Steven R.
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