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Loading page content...Ralph Merkle's 1990 block cipher. 64-bit block, 512-bit key. Defining feature: the 1KB S-box is entirely derived from the key, meaning every key uses a different substitution table. Status: legacy (64-bit block too small for modern use).
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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.
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