Method, system and mobile terminal for encrypting voice call

Abstract

The invention discloses a method, a system and a mobile terminal for encrypting a voice call. The method comprises the following steps of: when a calling mobile terminal carries out an encrypted call, informing an encryption identification for indicating encryption to a mobile switching center in a call establishment process; informing the encryption identification and a key subjected to encryption i.e. an encryption key to a called mobile terminal by the mobile switching center; and judging the received encryption identification by the called mobile terminal, then decrypting the encryption key, and carrying out an encrypted voice call with the calling mobile terminal. In the invention, the mobile terminals can freely select whether to encrypt the call process, and the mobile switching center encrypts the key in the process of transmitting the key, which can improve the security of the voice call between the mobile terminals; and in addition, the values of the key for encrypting and decrypting the call voice are different in different call processes, which can further improve the security of the voice call between the mobile terminals.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a method and system for realizing voice call encryption and a mobile terminal. Background technique [0002] As one of the important services of the mobile communication network, the voice call service is widely used by people, and the confidentiality and security of the call process have attracted much attention, so methods and equipment for realizing secure communication between mobile terminals have become very necessary. In the prior art, a device is generally added to the interface of the terminal equipment to encrypt and decrypt the signal; or the short message technology is used to realize key negotiation and delivery, and then the generated key is used for secure communication. [0003] For example, the Chinese patent application number 200510082951.9 discloses a method and device for implementing voice encryption in a communication system. The main technolog...

AI Technical Summary

Problems solved by technology

[0005] There are following deficiencies in the above method: one, the encryption and decryption device is relatively fixed, and is easily obtained by eavesdroppers

Once the eavesdropper obtains the same device, the communication of all similar mobile terminals will no longer be safe; 2. There is no key negotiation process, and the key used each time is fixed, so the security is not high

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