![]() ![]() The Linux kernel provides TLS offload infrastructure. Responsible for completing the key exchange using the information the server providedĪt this point, the connection is secured, both sides have agreed on an encryption algorithm, a MAC algorithm, and respective keys. Sends enough information to complete a key exchange-most often, this means sending a certificate including an RSA public key The cipher suites it is capable of working withĪ unique random number, which is important to guard against replay attacksĪssigns a session ID to the TLS connection The version of the protocol it understands 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:Ĭlient hello, provides the server at a minimum with the following:Ī key exchange algorithm, to determine how symmetric keys are exchangedĪn authentication or digital signature algorithm, which dictates how server authentication and client authentication (if required) are implementedĪ bulk encryption cipher, which is used to encrypt the dataĪ hash/MAC (message authentication code) function, which determines how data integrity checks are carried out Handshake – establishment of a connectionĪpplication – sending and receiving encrypted packets 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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