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Bruce Schneier designed Blowfish as a free, fast alternative to DES, with a distinctive twist: its own S-boxes are generated from the encryption key itself. Learn how it works and why it's still found in legacy systems today.
The Data Encryption Standard ruled cryptography for over two decades. Learn how its Feistel network works, why its 56-bit key ultimately doomed it, and why it still matters as the foundation for 3DES and AES.
Twofish was Bruce Schneier's answer to Blowfish's biggest weakness — and one of the five finalists in the competition that ultimately chose AES. Learn how its Feistel network, PHT mixing, and key-dependent S-boxes work.
