发明名称 |
METHOD AND APPARATUS TO MAINTAIN ENCRYPTION SYNCHRONIZATION IN A MULTI-MODULATION TDM SYSTEM |
摘要 |
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.
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申请公布号 |
WO03085870(A1) |
申请公布日期 |
2003.10.16 |
申请号 |
WO2002US37829 |
申请日期 |
2002.11.25 |
申请人 |
MOTOROLA, INC. |
发明人 |
LOGALBO, ROBERT, D.;CONRAD, ALAN;STOGNER, DARRELL |
分类号 |
H04K1/00;H04L9/12;(IPC1-7):H04K1/04;H04K1/06 |
主分类号 |
H04K1/00 |
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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