CDMA port-to-port encryption communication system and key distribution method thereof

Abstract

The invention discloses a CDMA port-to-port encryption communication system and a key distribution method thereof, the CDMA port-to-port encryption communication system comprises a CDMA network and a terminal mobile telephone thereof, a public switched telephone network and a terminal fixed-line telephone thereof, a short message service center as well as the following three cipher processing units including a cipher chip of a mobile telephone terminal, a key distribution management center (KDMC) and a Firmware cipher module of a gateway mobile switching center. The key distribution management center is used for key distribution management of the communication system. The key distribution is realized by a layered distribution method, i.e. a first layer is an equipment key which is distributed in the process of initialization; a second layer is a key-encryption key and a short message service key which are distributed in startup of an enciphered mobile telephone; and a third layer is a session key which is distributed every time a session is launched between the enciphered mobile telephones. At the same time, by adopting a bidirectional certification technology for key distribution and combination of a key update and remote destroying method, the safety risk in key exposure is reduced, and the communication safety is improved.

Description

technical field [0001] The invention relates to the technical field of mobile communication and information security, in particular to an authentication method between a mobile terminal and a key management and distribution center in CDMA secure communication, in particular to a key distribution method for CDMA end-to-end encrypted communication. Background technique [0002] With the widespread application of mobile communication technology, users have higher and higher requirements for the security of mobile communication. The circuit-switched network adopted by the core network of the existing CDMA is designed for non-encrypted telephone services. The transmission mode of information in the core network may be in plain text, which cannot eliminate the possibility of the message being monitored or stolen in the core network. . For some special industry users, such as the military, government and security departments, it is necessary not only to prevent the call from being...

AI Technical Summary

Problems solved by technology

In order to reduce the security risk of signal transmission on the air interface, security defense technologies such as authentication and air interface encryption are adopted, but they have limitations in key management and identity authentication.

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