US 2022/0066741 A1 · CRYPTOGRAPHY USING A CRYPTOGRAPHIC STATE

Abstract

Cryptographic methods and systems are described. Certain examples relate to performing cryptographic operations by updating a cryptographic state. The methods and systems may be used to provide cryptographic functions such as hashing, encryption, decryption and random number generation. In one example, a non-linear feedback shift register or expander sequence is defined. The non-linear feedback shift register or expander sequence has a plurality of stages to receive the cryptographic state, wherein at least one of the plurality of stages is updated as a non-linear function of one or more other stages. In certain examples, a cryptographic state is updated over a plurality of rounds. Examples adapted for authenticated encryption and decryption, hashing, and number generation are described.

Claims29

Dependent claims

Apparatus for permutating electronic data, the apparatus comprising:

an input interface to receive at least a cryptographic state, the cryptographic state comprising a plurality of bits;
a non-linear feedback shift register, the non-linear feedback shift register comprising a plurality of stages to receive the cryptographic state, the non-linear feedback shift register updating at least one of the plurality of stages as a non-linear function of at least one or more other stages in the plurality of stages;
a permutation engine to apply the non-linear feedback shift register to the cryptographic state over a plurality of rounds to update the cryptographic state;
and
an output interface to output the cryptographic state as updated by the permutation engine over the plurality of rounds.

2 more elements

Dependencies are inferred from the claim text.

Cryptography using a cryptographic state

Life of this patent

Cryptography using a cryptographic state

Life of this patent

Abstract

Claims29