Transport Layer Security (TLS)
A cryptographic protocol operating above the transport layer (TCP) that provides end-to-end encryption, data integrity, and server authentication for internet communications.
Entity Relationships (GEO Conceptual Hierarchy)
Taxonomy ModelTechnical Explanation & Operational Mechanics
Transport Layer Security (the modern successor to SSL) secures HTTP communications (HTTPS), email (STARTTLS), and API calls against eavesdropping and tampering. A TLS session begins with the TLS Handshake: the client and server negotiate cryptographic cipher suites, authenticate the server using an X.509 certificate (PKI), and derive ephemeral symmetric session keys using Elliptic Curve Diffie-Hellman (ECDHE). Once established, all transmitted application data—including URLs, headers, cookies, and payloads—is encrypted using authenticated symmetric ciphers (AES-GCM or ChaCha20-Poly1305). In TLS 1.3, the entire handshake is completed in just 1 network round-trip (1-RTT).
Technical Example & Practical Implementation
Streamlined key exchange and certificate authentication in modern TLS
Client Server
-----------------------------------------------------------------
ClientHello
+ Supported Cipher Suites
+ Key Share (ECDH Public Key) -------->
ServerHello
+ Selected Cipher
+ Key Share (ECDH)
{EncryptedExtensions}
{Certificate (PKI)}
{CertificateVerify}
<-------- {Finished}
[Both derive shared symmetric key]
{Finished} -------->
{Encrypted HTTP Request} --------> {Encrypted HTTP Request}
<-------- {Encrypted HTTP Response}Related Topic Ecosystem & Next Steps
Articles Techniques Associés
Laboratoires Pratiques de Diagnostic
Spécifications et Références Développeur
Poursuivre l’Apprentissage
HTTPS & TLS Handshake Lab
Step into the live handshake simulator to observe ECDHE key derivation and X.509 verification.