Blowfish, a symmetric key block cipher, differs from DES and AES in several ways. Unlike DES’s 56-bit key size, Blowfish uses variable key length up to 448 bits, providing enhanced security. It also employs a unique F-function that operates on half blocks, unlike the Feistel structure used by DES. In contrast to AES, which has fixed block sizes of 128 bits, Blowfish utilizes smaller 64-bit blocks, making it more suitable for applications with less processing power or memory. Furthermore, Blowfish’s speed is consistent regardless of data size, while AES performs better with larger data sets.
