![]() A unique random number, which is important to guard against replay attacks.The cipher suites it is capable of working with.The version of the protocol it understands. ![]() A hash/MAC (message authentication code) function, which determines how data integrity checks are carried out.A bulk encryption cipher, which is used to encrypt the data.An authentication or digital signature algorithm, which dictates how server authentication and client authentication (if required) are implemented.A key exchange algorithm, to determine how symmetric keys are exchanged.Client hello, provides the server at a minimum with the following:.In the handshake phase, the client and server decide on which cipher suites they will use, and exchange keys and certificates according to the following flow: Application – sending and receiving encrypted packets.Handshake – establishment of a connection.TLS works over TCP and consists of 3 phases: ![]() It runs in the application layer and is itself composed of two layers: the TLS record and the TLS handshake protocols. The TLS protocol aims primarily to provide cryptography, including privacy (confidentiality), integrity, and authenticity using certificates, between two or more communicating computer applications. The protocol is widely used in applications such as email, instant messaging, and voice over IP (VoIP), but its use in securing HTTPS remains the most publicly visible. Transport layer security (TLS) is a cryptographic protocol designed to provide communications security over a computer network.
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