Workspace
RC2
RC2
Ron Rivest's 1987 variable-key block cipher (RFC 2268). First cipher exportable from the US under 1990s export controls via "effective key bits" parameter. Used in SSL 2/3, TLS, and S/MIME. Mix-and-mash round structure. Historical/educational only — broken at ≤40-bit effective keys.
Workspace Presets
Save and restore visualizer settings in this browser.
Imported traces are validated and replayed locally. They never run a cipher operation automatically.
Recommended Next Step
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