Secure Transport Layer Protocol (TLS) is used to provide confidentiality and data integrity between two communication applications. The protocol consists of two layers: TLS Record Protocol (TLS Record) and TLS Handshake Protocol (TLS Handshake). The lower layer is a TLS recording protocol, which is located on a reliable transport protocol (e.g., TCP). The connection security provided by the TLS recording protocol has two basic features:
Private - symmetrical encryption is used to encrypt data (DES, RC4, etc.). The key generated by the symmetrical encryption is unique to each connection, and this key is based on another protocol (such as a handshake protocol) negotiated. The recording protocol can also be used without encryption. Reliable-information transmission includes information integrity checking using the MAC using the key. Safety hash function (SHA, MD5, etc.) for MAC calculations. The recording protocol can also be operated without Mac, but generally can only be used in this mode, that is, another protocol is using the recording protocol to transfer negotiate security parameters.
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