SRTP multicast session receiving party and SRTP multicast session sending party starts DTLS handshake, then performs safety strategy pulling-down process;

SRTP组播会话接收 方与SRTP组播会话发送方进行安全策略的下拉过程；

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The SRTP is deeply researched, and the AES-CM mode of SRTP is described detailed. The predominance of AES-CM performance that is compared with DES-CBC is analyzed.

对SRTP协议进行了深入研究，详细描述了SRTP协议采用的AES-CM加密模式，以及分析了其相对于DES-CBC模式所具有的性能优势。

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