GROUP SIGNATURE SYSTEM, DEVICE, PROGRAM AND METHOD

摘要

PROBLEM TO BE SOLVED: To reduce a computational quantity in a member side device and the number of times of exchanging information when generating a group signature. SOLUTION: A group member device 20 transmits consignment information Dlg_u of generation authority of a group signature to a proxy group signature generating device 30 only one time, and the proxy group signature generating device 30 generates a proxy group signatureρ. COPYRIGHT: (C)2007,JPO&INPIT