METHOD OF EXECUTING A CRYPTOGRAPHIC CALCULATION

摘要

A cryptographic calculation is executed in an electronic component, according to a cryptographic algorithm including at least one application of a one-way function which is disabled upon an intrusion into the electronic component. The one-way function is based on a first affine operation corresponding to a first secret key. The one-way function is applied, by obtaining (11) first and second random values (r, r'), then, by obtaining a first result (13) by applying a second affine operation (sK1), which corresponds to a second secret key, to a first combination (12) of the first and second random values, and, by obtaining (14) thereafter a second result by applying a third affine operation (OK2), which corresponds to a third secret key, to said first result. The combination of the third and second affine operations (sK2 o sK1) corresponds to the first affine operation; and a cryptographic operation is moreover applied (15) to one at least among said second result and a second combination of the first and second random values.