The Hasty Pudding Cipher (abbreviated HPC) is a variable-block-size block cipher which was an unsuccessful candidate in the competition for selecting the U.S.Advanced Encryption Standard. It was designed by Richard Schroeppel and has a number of unusual characteristics for a block cipher: Encryption Decryption In cryptography, a block cipher is a symmetric key cipher which operates on fixed-length groups of bits, termed blocks, with an unvarying transformation. ... Motto: E pluribus unum (1789 to 1956) (Latin: Out of Many, One) In God We Trust (1956 to present) Anthem: The Star-Spangled Banner Capital Washington, D.C. Largest city New York City Official language(s) None at federal level; English de facto Government • President • Vice President Federal Republic George... General Designer(s) Vincent Rijmen and Joan Daemen First published 1998 Derived from Square (cipher) Cipher(s) based on this design Crypton (cypher), Anubis (cipher), GRAND CRU Algorithm detail Block size(s) 128 bits note Key size(s) 128, 192 or 256 bits note Structure Substitution-permutation network Number of... Richard Schroeppel is an American mathematician who discovered the number of 5x5 magic squares. ...
Its block size is completely variable, from 1 bit up to arbitrary size. It can even encrypt objects whose size in bits is non-integral. For example, it can encrypt an integer range like 0-100, which is about 6.6 bits.
Its key length is also variable (but it must be a whole number of bits)
The encryption operation can include an additional input parameter called a "spice" that (along with the key) selects the permutation computed by the cipher. Changing spices is a lower overhead operation than changing keys, so the availability of the spice makes some interesting unconventional modes of operation possible. The notion of the spice was later formalized (with slightly stronger properties) in the definition of "tweakable" block ciphers by Liskov, Rivest, and Wagner (what HPC called a spice is now generally called a "tweak"). See the block cipher article for some more about tweakable ciphers.
Encryption Decryption In cryptography, a block cipher is a symmetric key cipher which operates on fixed-length groups of bits, termed blocks, with an unvarying transformation. ...
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