Identification system

• US 4,710,613 A
• Filed: 12/04/1985
• Issued: 12/01/1987
• Est. Priority Date: 12/13/1984
• Status: Expired due to Fees

• Current Assignee: Casio Computer Company Limited
• Original Assignee: Casio Computer Company Limited
• Inventors: Shigenaga, Yoshimi
• Primary Examiner(s): TRAFTON, DAVID
• Application Number:
  US06/805,187
• Time in Patent Office: 727 Days
• Field of Search: 235/379, 235/380, 235/382, 235/493, 380/24, 380/25, 340/825.34
• US Class Current: 235/380
• CPC Class Codes: G06Q 20/341 Active cards, i.e. cards including their own processing means, e.g. including an IC or chip
• CPC Class Codes: G07F 7/082 Features insuring the integrity of the data on or in the card
• CPC Class Codes: G07F 7/1008 Active credit-cards provided with means to personalise their use, e.g. with PIN-introduction/comparison system

Abstract

An identification system wherein validity between a first unit and a second unit is identified when the first unit is electrically communicated with the second unit. The first unit includes a generator for generating identification code information, a calculator for calculating, based upon the identification code information, an estimation time required for processing the identification code information in the second unit, a time counter for measuring an actual time required for completely processing the identification code information in the second unit, and an unit for identifying validity between said first and second units by comparing the actual processing time to the estimation processing time. The second unit includes at least a processor for processing the identification code information sent from the first unit.

Claims

1. An identification system wherein validity between a first unit and a second unit is identified when the first unit is electrically communicated with the second unit,

said first unit including:

means for generating identification code information;

means for calculating, based upon the identification code information, an estimation time required for processing the identification code information in the second unit;

means for measuring an actual time required for completely processing the identification code information in the second unit, and

means for identifying validity between said first and second units by comparing the actual processing time to the estimation processing time; and

said second unit including;

means for processing the identification code information sent from said first unit.

2. A system as claimed in claim 1, wherein when the actual processing time is substantially equal to the estimation processing time, validity between said first and second units is identified in the identifying means.

3. A system as claimed in claim 1, wherein the identification code generating means of said first unit includes:

means for generating random number data in relation to the communicated second unit, and

an encryptor for producing encryption data as the identification code data based upon the random number data.

4. A system as claimed in claim 3, wherein the encryptor is an RSA encryptor utilizing an RSA data encryption algorithm.

5. A system as claimed in claim 4, further comprising:

a first memory for storing a manufacture public key code (MPUK), and

a second memory for storing an issuer public key code (IPUK), whereby the RSA encryptor encrypts the random number data by utilizing said MPUK and IPUK codes in accordance with the RSA data encryption algorithm.

6. A system as claimed in claim 1, wherein said identification code information generating means includes an encryptor for producing encryption data corresponding to the identification code information.

7. A system as claimed in claim 6, wherein the encryptor is an RSA encryptor utilizing an RSA data encryption algorithm and a first memory is provided with the RSA encryptor for storing a specific encryption key code, whereby said RSA encryptor produces the encryption data by utilizing the specific encryption key code stored in the first memory.

8. A system as claimed in claim 1, wherein the estimation processing time is determined only by an architecture and also a processing algorithm of the identification code information processing means of said second unit.

9. A system as claimed in claim 1, wherein the identification code processing means of said second unit includes a decryptor for decrypting the identification code information sent from the first unit.

10. A system as claimed in claim 9, wherein the decryptor is an RSA decryptor utilizing an RSA data decryption algorithm.

11. A system as claimed in claim 10, further comprising:

a third memory for storing an issuer private key code (IPRK), and

a fourth memory for storing a manufacture private key code (MPRK), whereby the RSA decryptor decrypts the identification code information sent from the first unit by utilizing said IPRK and MPRK codes in accordance with the RSA data decryption algorithm.

12. A system as claimed in claim 7, wherein the decryptor is an RSA decryptor utilizing an RSA data decryption algorithm and a second memory is provided with the RSA decryptor for storing a specific decryption key code, whereby said RSA decryptor decrypts the encryption data by utilizing the specific decryption key code stored in the second memory.

13. A system as claimed in claim 1, wherein said first unit is an IC card terminal and said second unit is an IC card.

14. A system as claimed in claim 13, wherein the IC card terminal is initialized by receiving a personal identification number when electrically communicated with the IC card.