Authentication of an electronic tag

Abstract

A method and a system for authenticating an electronic tag by a host communicating with this tag via a reader, consisting of: calculating, on the tag side, a first digital signature by means of at least one first function shared by the tag and the reader, taking into account at least one first secret key known by the electronic tag and the reader only; transmitting the first signature to the reader; calculating, on the reader side, a second digital signal by means of at least one second function, different from the first function and shared by the reader and the host, taking the first signature into account; transmitting the second signature to the host; and checking, on the host side, the coherence between the second signature and a validation value calculated based on said second function and on a second secret key known by the host and by a single element selected from among the tag and the reader.

Dependencies are inferred from the claim text.