How does SSL differ from TLS?

SSL (Secure Sockets Layer) and TLS (Transport Layer Security) are both cryptographic protocols that provide secure communication between a client and a server. While SSL is the older protocol, TLS is its successor and is now the industry standard.

Here are the key differences between SSL and TLS:

1. Version:

  • SSL is an older protocol, with its latest version being SSL 3.0, which was released in 1996.
  • TLS is the newer protocol, with its current version being TLS 1.3, which was released in 2018.

2. Security:

  • SSL 3.0 has known vulnerabilities and is considered insecure. It is no longer recommended for use.
  • TLS 1.2 and later versions are considered secure and are widely adopted by websites and online services.

3. Encryption Algorithms:

  • SSL 3.0 uses weaker encryption algorithms compared to TLS.
  • TLS supports a wider range of stronger encryption algorithms, including AES, 3DES, and ChaCha20.

4. Handshake Protocol:

  • The SSL handshake protocol is less secure than the TLS handshake protocol.
  • The TLS handshake protocol uses more secure key exchange mechanisms, such as Perfect Forward Secrecy (PFS).

5. Renegotiation:

  • SSL 3.0 is vulnerable to renegotiation attacks, which allow an attacker to downgrade the security of the connection.
  • TLS 1.3 eliminates the renegotiation vulnerability.

6. Support:

  • SSL 3.0 is no longer supported by major browsers and operating systems.
  • TLS 1.2 and later versions are supported by all modern browsers and operating systems.

Overall, TLS is the more secure and recommended protocol for establishing secure connections between a client and a server. It addresses the vulnerabilities and limitations of SSL 3.0 and provides stronger encryption, more secure handshake protocols, and better protection against attacks.

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