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 a replacement for the aging 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.”
Notable features of the design include key-dependent S-boxes and a highly complex key schedule.
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Here are the advantages of using The Blowfish Algorithm. You can use it for your :
- Manipulates data in large blocks
- Has a 64-bit block size.
- Has a scalable key, from 32 bits to at least 256 bits.
- Uses simple operations that are efficient on microprocessors. e.g., exclusive-or, addition, table lookup, modular- multiplication. It does not use variable-length shifts or bit-wise permutations, or conditional jumps.
- Employs precomputable subkeys. On large-memory systems, these subkeys can be precomputed for faster operation. Not precomputing the subkeys will result in slower operation, but it should still be possible to encrypt data without any precomputations.
- Consists of a variable number of iterations. For applications with a small key size, the trade-off between the complexity of a brute-force attack and a differential attack make a large number of iterations superfluous. Hence, it should be possible to reduce the number of iterations with no loss of security (beyond that of the reduced key size).
- Uses subkeys that are a one-way hash of the key. This allows the use of long passphrases for the key without compromising security.
- Has no linear structures that reduce the complexity of exhaustive search.
- Uses a design that is simple to understand. This facilitates analysis and increase the confidence in the algorithm. In practice, this means that the algorithm will be a Feistel iterated block cipher.
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