Loading CryptoViz...
Loading page content...Loading CryptoViz...
Loading page content...Bruce Schneier's 1993 Feistel block cipher — pre-AES era workhorse used in SSH, OpenSSH, and the bcrypt key schedule. Unique for its key-dependent S-box structure: the 4×256 S-boxes are entirely re-derived from each key, making it immune to weak-key attacks that plagued DES.
Save and restore visualizer settings in this browser.
Imported traces are validated and replayed locally. They never run a cipher operation automatically.
Continue your cryptography learning path
A simple stream cipher performing byte-wise XOR operations between plaintext and key.
An unbreakable cipher when used with a truly random, single-use key of equal length to the plaintext.
Data Encryption Standard. A legacy 64-bit block cipher utilizing a 56-bit key size.
Related Resources