Twofish
Twofish is a symmetric-key block cipher designed as a candidate for the Advanced Encryption Standard (AES) competition in the late 1990s. It operates on 128-bit blocks and supports key sizes of 128, 192, or 256 bits, using a Feistel network structure with key-dependent S-boxes and a complex key schedule. Although not selected as the AES standard, it remains a respected and secure encryption algorithm used in various cryptographic applications.
Developers should learn Twofish when working on projects requiring strong encryption, such as secure file storage, VPNs, or cryptographic libraries, due to its high security margin and resistance to known attacks. It is particularly useful in legacy systems or niche applications where AES might not be suitable, or when implementing multiple cipher options for flexibility. Understanding Twofish also provides insight into cryptographic design principles and alternative encryption standards.