Patent ID: 7673144
Filing Date: 2010-03-02
Classification: H04L

Abstract:
1. A group signature device for providing a message (m) accompanied by a group signature (S), comprising: means for storing personalized data (z, Kz) identifying any one individual member (M) of a group (G), wherein said group signature device is associated to said one individual member (M) of the group (G); means for storing a predefined private signature key (SK) common to all members of the group (G); encryption means (B signing means (B means for outputting the message (m) and the group signature (S) to a checker, such that the checker, upon receiving the message accompanied by the group signature, is able to verify that the message (m) is associated with the group (U) based on the group signature (S), with the identity of the individual member (M) of the group (G) remaining anonymous to the checker.