| 摘要 |
#CMT# #/CMT# The method involves encrypting and storing a number (N1d) using a one-way function (f), and determining a cryptogram (X), from a secret identifier (IS) of the object, of the encrypted number and a random variable (R) which is generated by an authentication entity (SA) e.g. authentication server The cryptogram is transmitted to the entity and is decrypted by applying a decryption function to the cryptogram and to the variable in order to produce a decrypted identifier. An identifier equal to the decrypted identifier is searched in a database. #CMT# : #/CMT# Independent claims are also included for the following: (1) a system for authenticating an electronic object by an authentication entity (2) a computer program for authenticating an electronic object by an authentication entity. #CMT#USE : #/CMT# Used for authenticating an electronic object e.g. radio frequency identifier type electronic label, chip card, by an authentication entity e.g. authentication server, computer e.g. personal telecommunication device and personal digital assistant (PDA), portable home terminal, game console and home automated television set in telecommunication field from an attacker for protecting private life of a carrier of the label, where the label is utilized as an electronic pass in public transport or carried on a clothing of the carrier. #CMT#ADVANTAGE : #/CMT# The number is encrypted using the one-way function, thus prohibiting an attacker from knowing the contents of the object for deducing the value of the encrypted number of preceding authentications, and hence avoiding the attacker from deducing the value of the cryptogram exchanged between the object and the entity. The method does not include successive iterations of the secret identifier, thus obtaining a non traceable retroactive authentication, hence obtaining an integrated circuit, of the object, which is less complex. The method permits to have asymmetrical cryptographic algorithm which is simple to implement in electronic objects of small size. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic block for implementing an electronic object authenticating method. E : Electronic label f : One-way function IS : Secret identifier N1d : Number R : Random variable SA : Authentication entity X : Cryptogram. |
