For session encryption, the following symmetric algorithms are supported:
3DES (168-bit key)
AES (128-, 192-, or 256-bit key, CBC or CTR mode)
Arcfour (128-bit key)
Blowfish (128-bit key)
CryptiCore (Rabbit) (128-bit key)
SEED (128-bit key)
Twofish (128-, 192-, or 256-bit key)
2010 SSH Communications Security Corp.