Belonging position certification system

Abstract

Abstract PURPOSE:To perform belonging position certification while keeping privacy by providing a center with a prime number generator, a GCD calculator, a multiplier, a reciprocal number calculator, a power calculator, and a signature inspection device, and equipping a group manager with a signature device and a user with a random number generator, a power calculator, a multiplier, and a divider. CONSTITUTION:The center 100 uses the prime number generator 110, CGD calculator 120, and multiplier 130 to generate secret keys and open keys, controls the secret keys, and distributes the open keys to users and certifying persons. A user 300 calculates a value (c) obtained by randomizing secret information W with a random number by using the random number generator 310, power calculator 320, and multiplier 330. The group manager 200 signs on the value (c) with the signature device 210. The user sends the value (c) and signature to the center. The center inspects the signature with the inspection device 135 and calculates a value (d) with a secret key corresponding to the group by using the reciprocal number computer 140 and power calculator 150. The user 300 calculates the secret information from the open key and value (d). When the user proves the position in the group, the secret key is used to prove open information and secret information holding to the centifying person.

Inventors

• 👤 Kazuo Ota
• 👤 和夫 太田
• 👤 Tatsuaki Okamoto
• 👤 龍明 岡本

Bibliographic Details