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TLS/SSL (History (SSL 1.0, 2.0, and 3.0 (Netscape developed the original…

- - - - The implicit initialization vector (IV) was replaced with an explicit IV
      - Change in handling of padding errors
- - - - Symmetric cryptography is used to encrypt the data transmitted
      - Keys for this symmetric encryption are generated uniquely for each connection
      - Based on a shared secret negotiated at the start of the session
    - - Can be made optional
      - Generally required for at least one of the parties (typically the server).
- - - - Protection against a downgrade of the protocol to a previous version or a weaker cipher suite
      - Numbering subsequent Application records with a sequence number
      - Using a message digest enhanced with a key
      - The message that ends the handshake sends a hash of all the exchanged handshake messages seen by both parties
      - The pseudorandom function splits the input data in half and processes each one with a different hashing algorithm