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IMS是3G系统中核心网的一部分,它通过由会话初始协议(SIP)提供的会话性能,建立起端到端的会话。为了保证IMS网络中信息不被泄露,加入拓扑隐藏功能,通过加密SIP消息中的一些内部IP地址和其他网络信息,帮助保护IMS网络拓扑,实现网络的安全。IPSec ESP为所有SIP信令提供机密性保护,128bit加密块和密钥的CBC模式用于网络隐藏的加密算法,随机的初始化向量(IV)被用于每一次加密,采用AES算法来实现。
IMS is part of the core network in 3G systems and establishes an end-to-end session with session performance provided by the Session Initiation Protocol (SIP). To ensure that the information in the IMS network is not leaked, the topology hiding function is added to help protect the IMS network topology and secure the network by encrypting some internal IP addresses and other network information in the SIP message. IPSec ESP provides confidentiality protection for all SIP signaling. CBC mode with 128-bit encryption blocks and keys is used for network-hidden encryption algorithms. Random initialization vectors (IV) are used for each encryption and are implemented using the AES algorithm.