上海大字 SHANGH AI JIAO TONG INTVEANTY History and Development of SSL/TIS nl History c0-0 Nesco IETF TLS 1.2 SSL 2.0SSL 3.0TLS 1.0.1 TLS 1.2" refined 199419961999 2006200820112012 00c0 complete· minor changes MDS-SHA1→SHA256 redesign. no interoperation authenticated encryption with SSL3 e.g. AES in CCM mode can downgrade connections to rotectio ainst cBc-attacks SSL3 implicit I→ explicitⅳ MAC Message Authentication Code MD5 Message Digest Algorithm IETF Internet Engineering Task Force SHA Secure Hash Algorithm CBc Cipher Block Chaining AEs Advanced Encryption Standard Iv Initialization Vector CCM Counter with CBC-MAC Dan Luedtke <mail edant de>. Wed Apr IB, 2012.Universty of the Geman Federal /med Foree, Munich e stde 3History and Development of SSL/TLS