Patent ID: 11870911
Assignee: INFINEON TECHNOLOGIES AG
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC G  H

Claim 14:
15. A security device for compiling a cryptographic information, the security device comprising digital hardware and interface circuitry configured to:
(a) determine a first portion of the cryptographic information based on an input and a randomness;
(b) check whether a rejection criterion based on the first portion of the cryptographic information is fulfilled; and
(c) re-start step (a) with a new randomness in the event the rejection criterion is fulfilled with respect to the first portion of the cryptographic information; and,
(d) for each of at least one subsequent portion of the cryptographic information not yet determined,
(d1) determine a subsequent portion of the cryptographic information based on the input and the randomness for which the rejection criterion based on the first portion of the cryptographic information was not fulfilled,
(d2) check whether the rejection criterion is fulfilled based on the subsequent portion of the cryptographic information, and
(d3) re-start step (a) with a new randomness in the event the rejection criterion is fulfilled with respect to the respective subsequent portion of the cryptographic information; and

(e) convey the determined first portion of the cryptographic information and each determined subsequent portion.