Method for safety transfering medium flow

Abstract

This invention discloses a safe transmission method of medium current, and is applied to the next generation NGN network including the soft exchange and the terminal. The relating terminal contains the sending and receiving ends of medium current transmission. The characteristics are: (1) the process of the call establishment of R-T ends negotiates through the soft exchange, get the communication key code produced by the soft exchange and the safe parameter supported by the two terminals appointed by the soft exchange; (2) the sending end encodes or protects the medium current message according to the communication code key and safe parameter and send it to the receiving end; (3) the receiving end decodes and identifies the medium current message according to the communication code key and safe parameter, so as to realize the safe transmission of the medium current from the sending end to the receiving end. It also realizes the total identification of the original message through the setting of terminal applying layer resource mark, and solves the problem that the medium current can't identify the message sending origin after through NAT.

Description

technical field [0001] The present invention relates to a method for transmitting media streams in the communication field, in particular to a method for realizing secure transmission of media streams in NGN. Background technique [0002] NGN (Next Generation Network) is the abbreviation of Next Generation Network. It is a new public telecommunications network based on IP technology, that is, under a unified management platform, digital signals such as audio and video are transmitted between the Internet, mobile communication networks, and fixed-line communication networks, truly realizing broadband and narrowband integration. It is an integrated service network that integrates wired and wireless integration, active and passive integration, and transmission and access integration. That is to say, NGN is the development direction of the current communication field. [0003] Digital signals such as audio and video that are transmitted between the Internet, mobile communicati...

AI Technical Summary

Problems solved by technology

[0008] First, since other intermediate nodes except the sender 3 and receiver 5 can decrypt the media stream message, the system cannot guarantee the security of each intermediate node, thus reducing the safety factor of media stream transmission

[0009] Second, the system needs to allocate corresponding media stream encryption keys for both ends of each segment, which makes the key distribution of the entire system complicated. The nodes between the node and the segment also need to decrypt the media stream first, and then re-encrypt it before transmission, which not only brings a huge performance burden to the system, but also reduces the speed of media stream transmission, directly affecting real-time services such as voice quality of service

[0010] Third, in the actual NGN network networking, complex network environments such as multiple address translations are involved, and the current source authentication used to authenticate the identity of the sender uses the source address information in the IP header of the sender as the authentication content. In this way, there is a problem that the source of the message cannot be authenticated due to the IP address change when the media stream traverses the NAT (Netword Address Translation, Network Address Translation) device.

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