ANONYMOUS AUTHENTICATION METHOD BASED ON AN ASYMMETRIC CRYPTOGRAPHIC ALGORITHM

摘要

The invention relates to an anonymous authentication method based on an asymmetric cryptographic algorithm. The inventive method is used by an authentication entity (B) to authenticate a client entity (A) using a public-key encryption (ASYM (PB, R) )/decryption (ASYM(SB, R')) algorithm which is implemented at the client entity end and the authentication entity end respectively. At the client entity end, the inventive method comprises the following steps: generation of a cryptogram (R'), consisting in encrypting a message (R) containing an identification datum (idA) for the identification of said entity, a secret datum (KA) and an authentication counter value (CA, CB), thereby guaranteeing that the authentication is not performed a second time; and sending of the cryptogram to the authentication entity. At the authentication entity end, the method comprises the following steps: decryption of the cryptogram; using a database (BD) to save a record comprising at least the client entity identification datum, for each client entity to be authenticated; determination of the record corresponding to the decrypted identification datum; and verification of the correspondence between the decrypted secret datum and the secret datum of the client entity obtained from the record.