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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.
Blowfish Introduction:
Blowfish is a keyed, symmetric block cipher, designed in 1993 by Bruce Schneier and included in a large number of cipher suites and encryption products. Blowfish provides a good encryption rate in software and no effective cryptanalysis of it has been found to date. However, the Advanced Encryption Standard now receives more attention.
Schneier designed Blowfish as a general-purpose algorithm, intended as an alternative to the ageing DES and free of the problems and constraints associated with other algorithms. At the time Blowfish was released, many other designs were proprietary, encumbered by patents or were commercial/government secrets. Schneier has stated that, "Blowfish is unpatented, and will remain so in all countries. The algorithm is hereby placed in the public domain, and can be freely used by anyone."
Blowfish Security:
Blowfish was one of the first secure block ciphers not subject to any patents and therefore freely available for anyone to use. This benefit has contributed to its popularity in cryptographic software. Bruce Schneier notes that while Blowfish is still in use, he recommends using the more recent Twofish algorithm instead.
Blowfish Cipher Detail:
Key sizes: 32–448 bits
Block sizes: 64 bits
Structure: Feistel network
Rounds: 16