Sheet-shaped medium, method and apparatus for determination of genuineness or counterfeitness of the same, and apparatus for issuing certificate

• US 7,051,205 B1
• Filed: 08/25/2000
• Issued: 05/23/2006
• Est. Priority Date: 06/15/2000
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Usami, Mitsuo, Ohki, Masaru, Horiguchi, Akiko
• Primary Examiner(s): Sheikh, Ayaz
• Assistant Examiner(s): Parthasarathy, Pramila
• Application Number:
  US09/645,401
• Time in Patent Office: 2,097 Days
• Field of Search: 713/172, 713/176, 713/168, 726/20
• US Class Current: 713/172
• CPC Class Codes: B42D 2033/46 with electrical circuitry
• CPC Class Codes: B42D 25/29 Securities; Bank notes
• CPC Class Codes: B42D 25/305 Associated digital information record carriers for use with machines and with at least a part designed to carry digital markings G06K19/00
• CPC Class Codes: B42D 25/405 Marking
• CPC Class Codes: G06K 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
• CPC Class Codes: G07D 7/0047 using checkcodes, e.g. coded numbers derived from serial number and denomination
• CPC Class Codes: G07D 7/01 Testing electronic circuits therein
• CPC Class Codes: H04L 2209/60 Digital content management, e.g. content distribution
• CPC Class Codes: H04L 2209/80 Wireless
• CPC Class Codes: H04L 9/3249 using RSA or related signature schemes, e.g. Rabin scheme
• CPC Class Codes: H04L 9/3263 involving certificates, e.g. public key certificate [PKC] or attribute certificate [AC]; Public key infrastructure [PKI] arrangements network architectures or network communication protocols for supporting authentication of entities using certificates in a packet data network H04L63/0823

Abstract

The present invention provides a service system using a certificate which is easily portable and difficult to counterfeit. The feature of the invention is to use a contactless IC chip as a portable certificate. An IC chip-attached seal is thin and small, and therefore is easily portable and distributable to a user. By integrating or attaching (or sticking) the IC chip into or on a certificate 3910, the counterfeiting of certificate 3910 becomes difficult.

Claims

1. An apparatus for issuing a certificate comprising:

a certificate paper-accommodating part which accommodates certificates made of sheet-shaped mediums and comprising an attached IC chip which stores first information; and

a printing part which prints second information and a digital signature on a surface of the certificates,

wherein the digital signature is generated form the first information and the second information.

2. The apparatus according to claim 1, wherein the digital signature is generated from the first information and the second information using RSA public key encryption.

3. The apparatus according to claim 1,

wherein the digital signature is a hashed sum of the first information and the second information using RSA public key encryption.

4. The apparatus according to claim 1,

wherein the first information is represented by x1, the second information is represented by x2 and the digital signature is represented by y, secret keys are represented by d and n, and the digital signature is obtained by the equation

y=(x1+x2)**d mod n, where the function “

+”

represents linking of x1 and x2 to each other.