About Bruce Schneier. One of the reasons that it wasn’t selected as the advanced encryption standard is due to its slower speed. It supports various Algorithms such as Arcfour,Blowfish,Blowfish-compat,Cast-128,Cast-256,Des,Gost,Loki97,Rc2,Rijndael-128,Rijndael-192,Rijndael-256,Saferplus,Serpent,Tripledes,Twofish,Xtea. This is very unique code decrypter tool which helps to decrypt data with different encryption algorithms. This is … I'm a fellow and lecturer at Harvard's Kennedy School, a board member of EFF, and the Chief of Security Architecture at Inrupt, Inc. Twofish is a symmetric block cipher; a single key is used for encryption and decryption. It was one of the five Advanced Encryption Standard(AES) finalists, and was not selected as AES. Because Twofish uses “pre-computed key-dependent S-boxes”, it can be vulnerable to side channel attacks. I am a public-interest technologist, working at the intersection of security, technology, and people.I've been writing about security issues on my blog since 2004, and in my monthly newsletter since 1998. Symmetric ciphers use the same (or very similar from the algorithmic point of view) keys for both encryption and decryption of a message. Twofish Encryption Algorithm Twofish is a symmetric key block cipher. Symmetric Ciphers Online allows you to encrypt or decrypt arbitrary message using several well known symmetric encryption algorithms such as AES, 3DES, or BLOWFISH. Twofish is fast on both 32-bit and 8-bit CPUs (smart cards, embedded chips, and the like), and in hardware. Like Blowfish, Twofish uses block cipher ing. Currently there is no successful cryptanalysis of Twofish. Twofish is a block cipher by Counterpane Labs, published in 1998. Twofish has a block size of 128 bits, and accepts a key of any length up to 256 bits. (NIST eventually selected the Rijndael algorithm.) This is of great advantage because encryption and decryption are quite similar in structure, the only major differences are the keys used in those processes. (NIST required the algorithm to accept 128-, 192-, and 256-bit keys.) Twofish has a 128-bit block size, a key size ranging from 128 to 256 bits, and is optimized for 32-bit CPUs. Though the NIST enforces the use of only 128, 192, and 256 -bit keys for encryption. Twofish is an encryption algorithm based on an earlier algorithm, Blowfish, and was a finalist for a NIST Advanced Encryption Standard (AES) algorithm to replace the DES algorithm. Twofish consists of 16 rounds built similar to the Feistel network structure. Any encryption standard that uses a 128-bit or higher key, is theoretically safe from brute force attacks. Also, both inputs and outputs are XORed with 8 keys K0....K7. And it's flexible; it can be used in network applications where keys are changed frequently and in applications where there is little or no RAM and ROM availabl… Twofish is in this category. Twofish is seen as a very secure option as far as encryption protocols go. It has a block size of 128 bits with key sizes of up to 256 bits.