Patent ID: 7581109

Claim:
A method of delegating signing of predetermined data by a given one of M first members mandated by N second members, M and N being integers of which one is equal to 1 and the other is at least equal to 2, the given first member having a terminal including first information on said given first member, said method comprising the following steps: reading from said terminal first information on said M first members and second information on said N second members included in delegation means responsive to a first identifier of said given first member included in said first information and transmitted by said terminal to said delegation means, said second information on a second member comprising at least an identifier of said second member, concatenating in said terminal (a) predetermined data, (b) said first information and (c) said second information into concatenated data, signing said concatenated data by using a first private key of said given first member in a cryptographic algorithm included in said terminal to produce a signature, and transmitting, from said terminal, said concatenated data, and said signature to any user terminal interested in said predetermined data.