Being the group signature device to which the member certificate acquisition device, the member certificate issue device, the group signature device

摘要

As for this invention, the safety in the group signature system it improves, in addition, it designates that the data quantity which is handled is decreased as purpose, when the group 1 where the digit is the same, group 2, description and group 1 of double-wire shape mapping to group T, group 2, each generating program and the aforementioned group 1 of group T and group E, the aforementioned group 2, the aforementioned group open key where the signature open key of the signature system which uses the aforementioned group T is included is input from description and the group 1 for 4 groups of group T and group E and group 2, the description aboveWhen member evidence and the aforementioned group 1 which are the value which multiplies the aforementioned member secret key in the aforementioned generating program of the aforementioned member secret key and the aforementioned group E which include the integer below the digit or the aforementioned group 1 which is the value which multiplies the aforementioned member secret key in the aforementioned generating program of group 2 or the element of group 2 and, it transmits to the aforementioned member certificate issue device, after that, it receives the signature for the verification possibility, aforementioned member secret key with the aforementioned signature open key from the aforementioned member certificate issue device, the said signature is designated as the aforementioned member certificate.