CRYPTOGRAPHIC METHOD USING AN IDENTITY-BASED ENCRYPTION SYSTEM

摘要

The invention concerns a method for generating keys designed for a public key cryptographic algorithm used in the context of a cryptographic system based on the identity of a user of the system and including the following steps: obtaining (10, 50) a set of public (g, g1, g2, u', U) and private (g2a ) parameters associated with said identity-based cryptographic system; selecting a public identifier (ID) comprising an information of said user's identity and determining (20) an identity vector (v) representing said identifier pertaining to said user; generating (30, 60) a public (PKID)/key private (dv)key pair associated with said user's identity, based on said public and private parameters and on said identity vector (v). The invention is characterized in that the elements (vi) of said identity vector (v) are encoded each on k bits, with k1.