| 摘要 |
The present invention discloses a method for determining encryption algorithm of the secret communication based on Mobile Country Codes, which includes the following steps: Set up a MCC codes table in the core network (CN) in advance, and store the MCC codes of all countries or operators that use the same independent development encryption algorithm as our native country does; When subscriber call or be called, it transmits its own international Mobile Subscriber Identity information to the CN, the CN draws out this subscriber's MCC code from this information and compare the drawn MCC code with each element of the codes table one by one, if they are the same, the CN will choose the encryption algorithm of national independent development; if they are not the same or MCC codes table is empty, the CN will choose one standard encryption algorithm; Then the CN transmits the encryption algorithm identification corresponding to the selected encryption algorithm to the access network; the access network then transmits the encryption algorithm identification to the user terminal. This method allows standard encryption algorithm and independent development encryption algorithm coexisting, and simplified the process of selecting encryption algorithm, and further guarantees user's advantages and service qualities.
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