Twofish, conceived by Bruce Schneier and Counterpane Labs in 1998, remains a stalwart in encryption, standing undefeated against all attempts to breach its security.
Renowned for its resilience, many cryptographers consider Twofish to surpass the widely adopted Rijndael/AES algorithm in terms of security. This distinction is underscored by the algorithm's utilization of pre-computed key-dependent S-boxes and a sophisticated key schedule.
In Twofish, half of an n-bit key serves as the primary encryption key, while the remaining half modifies the encryption algorithm through key-dependent S-boxes. Drawing inspiration from various cryptographic designs, Twofish incorporates elements such as the pseudo-Hadamard transform from the SAFER family of ciphers and a Feistel structure akin to DES. Additionally, Twofish employs a Maximum Distance Separable matrix, enhancing its robustness against potential attacks.