Title:
A METHOD FOR DECRYPTION CIPHER SWITCHING, DECRYPTION APPARATUS AND TERMINAL DEVICE
Document Type and Number:
WIPO Patent Application WO/2007/140677
Kind Code:
A1
Abstract:
A cipher switching method where the terminal side stores a current decryption cipher comprises the steps of: the terminal side receiving and storing a decryption cipher corresponding to the service data updated sent down from the network side before the encryption cipher of the service data updated; the terminal side selecting a cipher capable of succeeding in decrypting the current service data from the ciphers stored locally and switching the cipher as a current decryption cipher after the encryption cipher is changed on the network side. A data decryption apparatus is used to implement the method and a terminal device has corresponding decryption function. It can switch the cipher capable of succeeding in decrypting the current service data stored locally as a current decryption cipher by using the method, so as to adaptively switch the cipher. The switching process has no special demand on the distribution ways of the cipher and synchronization, and need not increase the cost to support the mechanism of strict data frame synchronization.
Inventors:
MA YONG (CN)
Application Number:
PCT/CN2007/000712
Publication Date:
December 13, 2007
Filing Date:
March 06, 2007
Export Citation:
Assignee:
HUAWEI TECH CO LTD (CN)
MA YONG (CN)
MA YONG (CN)
International Classes:
H04L9/16; H04H60/23; H04H1/00
Foreign References:
| CN1604534A | 2005-04-06 | |||
| JP2003283485A | 2003-10-03 | |||
| US20050201564A1 | 2005-09-15 |
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (Scitech PlaceN° 22, Jian Guo Men Wai Ave.,Chao Yang District, Beijing 4, CN)
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