TLS vs SSL: Encryption Protocol Evolution

Mon, 03 Aug 2026 04:17:43 +0900

Overview

SSL and TLS are cryptographic protocols that secure data in transit between clients and servers, but SSL is the deprecated predecessor while TLS is its actively maintained successor. Every SSL version is now broken or prohibited, yet the term “SSL” persists in everyday usage even though modern connections actually negotiate TLS.

Comparison Diagram

Comparison Table

Aspect	SSL	TLS
Origin	Developed by Netscape starting in 1995	Standardized by the IETF in 1999 as SSL’s successor
Versions released	SSL 2.0, SSL 3.0 (SSL 1.0 never shipped)	TLS 1.0, 1.1, 1.2, 1.3
Handshake process	Full handshake only, with weaker key exchange options	Streamlined handshake; TLS 1.3 cuts a round trip and defaults to forward secrecy
Cipher suite support	Permits weak ciphers like RC4, DES, and export-grade crypto	Mandates modern AEAD ciphers (AES-GCM, ChaCha20-Poly1305); weak ciphers dropped entirely in 1.3
Known vulnerabilities	POODLE broke SSL 3.0; DROWN broke SSL 2.0	BEAST and CRIME hit early TLS 1.0 but were patched in later versions
Current status	All versions formally deprecated and prohibited (RFC 7568)	TLS 1.2 and 1.3 are the current standards; 1.0/1.1 also deprecated
Everyday terminology	“SSL certificate” and “SSL/TLS” persist as colloquial shorthand	The protocol actually negotiated by nearly every modern HTTPS connection

Key Differences

SSL is the obsolete predecessor; TLS is the actively maintained successor protocol
TLS 1.3’s handshake trims a round trip compared to SSL’s full handshake
SSL still permits weak ciphers like RC4; TLS mandates modern AEAD ciphers
The label “SSL certificate” survives in marketing even though browsers negotiate TLS
SSL 3.0 was broken by POODLE, forcing its complete deprecation

When to Use Each

SSL

Ssl on IT Comparison

TLS vs SSL: Encryption Protocol Evolution

Overview

Comparison Diagram

Comparison Table

Key Differences

When to Use Each