Method for generating many-time restrictive blind signatures

• US 7,162,639 B1
• Filed: 08/31/2005
• Issued: 01/09/2007
• Est. Priority Date: 10/25/1999
• Status: Expired due to Fees

• Current Assignee: AT&T Corporation (AT&T, Inc.)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Bleumer, Gerritt
• Primary Examiner(s): Moise; Emmanuel L.
• Assistant Examiner(s): CALLAHAN, PAUL E
• Application Number:
  US11/216,671
• Time in Patent Office: 496 Days
• Field of Search: 380/28, 380/44, 705/66, 705/74, 705/94, 713/176, 713/180, 726/10, 726/19
• US Class Current: 713/180
• CPC Class Codes: G06Q 20/3672 initialising or reloading thereof
• CPC Class Codes: G06Q 20/382 insuring higher security of transaction
• CPC Class Codes: G06Q 20/383 Anonymous user system
• CPC Class Codes: H04L 9/3257 using blind signatures

Abstract

A multiple use ticket generating method is disclosed which enables a recipient to obtain signatures for arbitrarily many (correctly formed) messages after only one interaction with the signer. The method provides a blind signature in a ticket, the signature having a multiple use with a built-in expiration. Then, the method develops a blinding value for the signature in a reproducible computation using a seed key substantially known only to the issuer of the ticket. The method implements a new class of signature schemes almost as efficiently as do previous one-time restrictive blind signature methods.

Claims

1. A multiple use ticket method, comprising:

providing a blind signature in a ticket, the signature having a multiple use; and

developing a blinding value for the signature in a reproducible computation using a seed key known to the issuer of the ticket, wherein said signature does not require an interactive signing protocol.

2. The method of claim 1, wherein said ticket is an electronic personal ticket.

3. The method of claim 1, wherein said ticket is an electronic season ticket.

4. The method of claim 1, wherein said ticket is an untraceable electronic personal ticket.

5. The method of claim 1, wherein said ticket is a personal license.

6. The method of claim 1, wherein said ticket is a personal driver'"'"'s license.

7. The method of claim 1, wherein said ticket is an offline personal ticket.

8. A system for generating a multiple use ticket, comprising:

means for providing a blind signature in a ticket, the signature having a multiple use; and

means for developing a blinding value for the signature in a reproducible computation using a seed key known to the issuer of the ticket, wherein said signature does not require an interactive signing protocol.

9. An article of manufacture for a computer system, for providing a multiple use ticket, comprising:

a computer readable medium;

computer code in said computer readable medium for providing a blind signature in a ticket, the signature having a multiple use; and

computer code in said computer readable medium for providing a blinding value for the signature in a reproducible computation using a seed key known to the issuer of the ticket, wherein said signature does not require an interactive signing protocol.