TLS(Transport Layer Security)
TLS(Transport Layer Security), base on TCP, build from SSL(Secure Socket Layer).
1. Why?
应用层的报文明文传输，存在安全性,可靠性问题，所以在应用层和传输层中间加上SSL/TSL协议
2. What?
保密(message privacy)
完整性(message integrity)
认证(mutual authentication)
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