SSL (Secure sockets layer) was its original name when it was built by Netscape. SSL was renamed TLS when the standard was taken over by the IETF and the version number was reset to one. So SSL version 2 (which is now obsolete) came before SSL version 3. But SSL v3 was followed by TLS v1.0. The current version, at the time of writing, is TLS v1.2.
In January this year (2010), Gmail switched to using HTTPS for everything by default.
Modern hardware can perform 1500 handshakes/second/core. That’s assuming that the handshakes involve a 1024-bit RSA private operation (make sure to use 64-bit software).
SSL/TLS – Cryptographic protocols provides security for communication..
Two way of secured communication
Unilateral – Server only authenticated
Bilateral – Both Server and Clients are authenticated
CipherSuite – Its a combination of Crypto-algorithms & used in SSL/TLS.
CipherSuite consist of four parts,
1) Key Exchange
3) Encryption/Decryption and
4) Digest or Integrity
Different set of algorithms are used based on their level of security and efficiency.
The OpenSSL v1.0 supports the following set of algorithms
You can view these things, by using the following command :
openssl ciphers ALL
For Example : DHE-RSA-AES256-SHA
DHE – Diffie Hellman Algorithm in Ephemeral mode used for Key Exchange
RSA – used for Authentication
AES256 – used for Encryption
SHA – used for Digest