Symmetric Encryption

DES/3DES
AES
Twofish
Blowfish
Serpent
IDEA
RC4, RC5, RC6
CAST

Key Length for symmetric is 56-256 bits

DES	Data Encryption Standard 56 bit key encryption (16 cycles of 48 bit subkeys)
3DES	Triple DES 168 bit key encryption (48 cycles)
AES	Advanced Encryption Standard A block of cipher uses a 128 bit block size and a 128-, 129, or 256 bit key size.