Synchronization of encryption in a wireless communication system
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United States of America Patent
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Oct 14, 2008
Grant Date -
Jan 2, 2003
app pub date -
Dec 19, 2001
filing date -
Dec 19, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Disclosed embodiments include a method for synchronizing a cryptosystem. In one embodiment, the method uses existing control data that is transmitted as part of a connection establishment process in a wireless communication system. In one embodiment, messages that are normally sent between a base station and a remote unit during the setup of both originating and terminating calls are parsed to detect a particular control message that indicates the start of telephony data transmission. Detection of this message indicates a point at which encryption/decryption can begin, and is used to synchronize the cryptosystem. Synchronizing a cryptosystem involves generating an RC4 state space in a keyed-autokey ('KEK') encryption system. In one embodiment, Lower Medium Access Channel ('LMAC') messages are used according to a wireless communication protocol. This is convenient because the LMAC messages are passed through the same Associated Control Channel ('ACC') processing that encrypts and decrypts the telephony data.
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