TLS
TRANSPORT-LAYER-SECURITY, commonly known as TLS, is a cryptographic protocol designed to provide communications security over a computer network. It is the direct successor to the now-deprecated SSL (Secure Sockets Layer) protocol. The primary goal of TLS is to ensure privacy, data integrity, and authenticity between two communicating computer applications. When a connection is secured by TLS, it ensures that no third party can eavesdrop on or tamper with the messages being exchanged.
Core Components and Mechanisms
The protocol is composed of two main layers: the TLS-RECORD-PROTOCOL and the TLS-HANDSHAKE-PROTOCOL. The handshake allows the server and client to authenticate each other and to negotiate an encryption algorithm and cryptographic keys before data is transmitted. This process often involves the use of DIGITAL-CERTIFICATES issued by a trusted CERTIFICATE-AUTHORITY to verify the identity of the parties involved. According to the Internet Engineering Task Force (IETF), the latest iteration, TLS-1.3, significantly improves performance and security by removing obsolete cryptographic features.
Security Features
TLS employs ASYMMETRIC-CRYPTOGRAPHY for key exchange and SYMMETRIC-ENCRYPTION for bulk data transfer. It also utilizes MESSAGE-AUTHENTICATION-CODES to prevent unauthorized alteration of data during transit. As noted by the Cloudflare Learning Center, implementing TLS is a fundamental requirement for modern HTTPS websites to protect user credentials and sensitive information.