Apparatus and method for decrypting an encrypted bit sequence
AssigneeInfineon Technologies AG
InventorsThomas Poeppelmann, Peter PeßL, Daniel Heinz, Julius Hermelink
Life of this patent
Estimating the term…
Abstract
An apparatus for decrypting an encrypted bit sequence comprises a test device configured to subject the bit sequence to a statistical test in view of an expected distribution of the bits in the bit sequence in order to obtain a test result. The apparatus is configured to decrypt the bit sequence should the test result indicate that the distribution follows the expected distribution, and to not decrypt the bit sequence should the test result indicate that the distribution does not follow the expected distribution.
Claims20
An apparatus for decrypting an encrypted bit sequence, comprising:
- decryption circuitry configured to perform decryption of bit sequences according to a cryptosystem;
- test circuitry configured to subject the bit sequence to a statistical test in view of an expected distribution of the bits in the bit sequence, to obtain a test result;
- and
- control circuitry configured to control the decryption circuitry so as to decrypt the bit sequence should the test result indicate that the distribution follows the expected distribution and to not decrypt the bit sequence should the test result indicate that the distribution does not follow the expected distribution.
A method for verifying a bit sequence encrypted according to a cryptosystem, comprising:
- carrying out a statistical test on the bit sequence in view of an expected distribution of bits in the bit sequence in order to obtain a test result;
- decrypting the bit sequence according to the cryptosystem should the test result indicate that the distribution follows the expected distribution;
- or not decrypting the bit sequence should the test result indicate that the distribution does not follow the expected distribution.
Dependencies are inferred from the claim text.