We present in this paper an implementation of an electronic ID card which allows its holder to reveal (and prove) only a part of his identity. In many cases, only a few pieces of information are required from the user, and classical schemes do not allow him to reveal only these specific pieces. For example, he must reveal his whole identity even though he is just required to prove that he is of age. To solve this problem, we present in this paper an identification scheme which allows the prover to reveal to the verifier only a part of his identity. Then, depending on the context, the user will be able to prove his full identity, only a part of it or just that he is of age. The part of the identification scheme performed by the smart card requires less than 10 exponentiations which can be pre-computed, so it can be easily implemented in a smart card.
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