What is the difference between SSL and TLS protocols?

TLS is the successor to SSL. SSL v3.0 served as the basis for TLS 1.0. Although the term "SSL" is often used generally for all versions, in fact, newer versions of SSL (3.0) and all versions of TLS are different, though similar, protocols. TLS includes security improvements and ceases support for weak cryptographic algorithms used in earlier SSL versions.

Main differences:

• Version history: SSL has versions 1.0 (unpublished), 2.0 (deprecated, insecure), and 3.0. TLS has versions 1.0, 1.1, 1.2, and 1.3 (current).
• Cryptographic algorithms: TLS supports more modern and secure encryption, hashing, and key exchange algorithms, and also stops support for weak SSL algorithms.
• Message management: TLS uses a different message format and an alert protocol for error handling.
• Handshake procedure: TLS has improvements in the handshake process to enhance security and performance.

Comparison table (simplified):

Characteristic	SSL 3.0	TLS 1.0 and above
Basis for	TLS 1.0	Successor to SSL
Supported algorithms	Includes weaker ones	Supports stronger ones
Alert protocol	Simpler	Improved Alert Protocol
Security	Lower, vulnerable to attacks	Higher, includes measures against known attacks

Currently, the use of SSL v2.0 and v3.0 is not recommended due to their vulnerabilities. TLS 1.2 and especially 1.3 are industry standards for secure communication.