A Transport Layer Security (TLS) session refers to a secure communication session established between a client and a server using the TLS protocol. It encompasses the entire process from the initial handshake, where the client and server negotiate security parameters, to the secure exchange of data using encryption algorithms agreed upon during the handshake. A TLS session remains active until explicitly terminated by either the client or the server, providing secure and authenticated communication over the network.
The primary security protocol used at the transport layer is Transport Layer Security (TLS). TLS is a cryptographic protocol designed to provide secure communication over a computer network. It operates at the transport layer of the OSI model, ensuring data confidentiality, integrity, and authentication between communicating applications.
SSL (Secure Sockets Layer) and TLS (Transport Layer Security) are cryptographic protocols used to secure communication over a computer network. SSL was the predecessor to TLS, developed by Netscape in the early 1990s. TLS, introduced in the late 1990s and defined by the Internet Engineering Task Force (IETF), is an updated and more secure version of SSL. TLS versions have addressed vulnerabilities found in SSL and earlier versions of TLS, providing stronger encryption algorithms, improved handshake mechanisms, and better resistance against attacks.
Mandatory Transport Layer Security (TLS) refers to a policy or requirement mandating the use of TLS for securing network communications. It ensures that all communication between clients and servers is encrypted and authenticated using TLS protocols, mitigating the risks associated with transmitting sensitive information over unsecured channels.
SSL (Secure Sockets Layer) and its successor TLS (Transport Layer Security) operate at the transport layer (Layer 4) of the OSI model. They provide secure communication services, including encryption, authentication, and data integrity, between applications running on different hosts across a network. This layer-specific placement ensures that SSL/TLS can protect data during transmission while maintaining compatibility with various application-layer protocols like HTTP, SMTP, and FTP.
