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The secure asymmetric cryptographic algorithm includes: 3DES, Blowfish, Cast128, DES, Thin Ice, Ice, Ice2, RC2, RC4, Rijndael, Serpent, Tea and Twofish.

Twofish Introduction:

In cryptography, Twofish is a symmetric key block cipher with a block size of 128 bits and key sizes up to 256 bits. It was one of the five finalists of the Advanced Encryption Standard contest, but was not selected for standardization. Twofish is related to the earlier block cipher Blowfish.

Twofish's distinctive features are the use of pre-computed key-dependent S-boxes, and a relatively complex key schedule. One half of an n-bit key is used as the actual encryption key and the other half of the n-bit key is used to modify the encryption algorithm (key-dependent S-boxes). Twofish borrows some elements from other designs; for example, the pseudo-Hadamard transform (PHT) from the SAFER family of ciphers. Twofish uses the same Feistel structure as DES.

On most software platforms Twofish was slightly slower than Rijndael (the chosen algorithm for Advanced Encryption Standard) for 128-bit keys, but somewhat faster for 256-bit keys.

Twofish Security:

In 1999, Niels Ferguson published an impossible differential attack that breaks 6 rounds out of 16 of the 256-bit key version using 2^256 steps.

Twofish Cipher Detail:

Key sizes: 128, 192 or 256 bits
Block sizes: 128 bits
Structure: Feistel network
Rounds: 16

See also: http://en.wikipedia.org/wiki/Twofish