Back to results
US 2002/0118827 A1Published application
Block cipher method
OwnerFrank C. Luysterinventor
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
OwnerFrank C. Luysterinventor
Estimating the term…
A data encryption system for encrypting an n-bit block of input in a plurality of rounds is presented, where n is preferably 128 bits or more. The data encryption system includes a computing unit for the execution of each round; memory for storing and loading segments; a bit-moving function capable of rotating, shifting, or bit-permute round segments by predetermined numbers of bits preferably to achieve active and effective fixed rotation; a linear combination function which provides new one-to-one round segments using a round operator generally from one algebraic group to combine two different one-to-one round segments taken from one one-to-one round segment set; and a nonlinear function which affects a one-to-one round segment from a particular one-to-one round segment set based on a value which depends on a preselected number of bits in a preselected location from a different one-to-one round segment from the same one-to-one round segment set. The nonlinear function is a variable rotation function or an s-box. A subkey combining function is generally employed in each round to provide new round segments by combining a round segment typically linearly with a subkey segment.
A method of enciphering plaintext in a block cipher, comprising:
A system for enciphering plaintext in a block cipher, comprising:
A data signal propagated over a propagation medium, said data signal including enciphered plaintext, said enciphered plaintext originating from plaintext which has been enciphered by enciphering said plaintext in a block cipher, said enciphering comprising:
Dependencies are inferred from the claim text.