发明名称 METHOD AND APPARATUS FOR DECRYPTING A COMMUNICATION
摘要 <p>A decryption apparatus (109) comprises a key stream generator (111) generating a local decryption key stream. It furthermore comprises a synchronisation value receiver (201) receiving key stream synchronisation values. A synchronisation processor (203) implements a state machine which may operate in a synchronised state (303) wherein the communication is decrypted using the local key stream, a non-synchronised state (301) wherein the local key stream is not synchronised, or in an uncertain synchronisation state (305) wherein the communication is decrypted using the local key stream and wherein the local key stream is synchronised to each new received synchronisation value. The synchronisation processor (203) furthermore comprises a transition controller (213) operable to transition from the synchronised state to the non-synchronised state in response to a first criterion and to the uncertain synchronisation state in response to a second criterion.</p>
申请公布号 WO2005114884(A1) 申请公布日期 2005.12.01
申请号 WO2005US13208 申请日期 2005.04.20
申请人 MOTOROLA, INC., A CORPORATION OF THE STATE OF DELAWARE;PEDERSEN, KRISTIAN, GRONKJAER 发明人 PEDERSEN, KRISTIAN, GRONKJAER
分类号 H04K1/00;H04L9/12;H04L9/18;(IPC1-7):H04K1/00 主分类号 H04K1/00
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