TLSSSLi
TLSSSLi is a cryptographic protocol that integrates features of Transport Layer Security (TLS) and Secure Sockets Layer (SSL) to provide enhanced security and compatibility across legacy and modern systems. The protocol was first proposed in 2015 by a consortium of network security researchers to address interoperability issues between older SSLv3 endpoints and newer TLS 1.3 implementations. TLSSSLi operates by negotiating a hybrid cipher suite that supports both SSLv3 and TLS 1.3 key exchange mechanisms, allowing a single handshake to secure traffic for either protocol version depending on the connection requirements.
The protocol specifies a set of extensions to the TLS handshake that indicate SSLv3 support and allows
TLSSSLi is defined in RFC 7777, which provides detailed state machine diagrams and security analyses. The protocol