发明名称 |
SYNCHRONIZATION OF ENCRYPTION IN A WIRELESS COMMUNICATION SYSTEM |
摘要 |
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. |
申请公布号 |
WO0251058(A3) |
申请公布日期 |
2002.07.25 |
申请号 |
WO2001US50206 |
申请日期 |
2001.12.19 |
申请人 |
AT & T WIRELESS SERVICES, INC.;KLINGLER, ERIC;TEDESCHI, JEFFREY |
发明人 |
KLINGLER, ERIC;TEDESCHI, JEFFREY |
分类号 |
H04L9/12;H04L29/06;H04W12/00;H04W12/02;H04W56/00 |
主分类号 |
H04L9/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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