Method and device for generating digital signatures of digital data

Abstract

Method and device for generating a digital signature of digital data The present invention relates to a method for generating a digital signature of digital data forming a digital message, in a stateless cryptosystem based on hashing, comprising: - a first phase (20) of pre-calculation (24) of a first part of the digital signature, independently of the digital message, and a storage (26) of at least a first part of the digital signature in a memory of said device, - a second phase (30) of calculating the digital signature of the digital message comprising: - a calculation (32-36) of a second part of the digital signature as a function of an input value dependent on said digital message, and - a generation (38) of the digital signature of the digital message by concatenation of the first part of the digital signature, calculated in the first pre-calculation phase, and the second part of the digital signature.Figure for the abbreviation: Figure 3.

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