Method for generating many-time restrictive blind signatures
AssigneeAT&T Corp.
InventorGerritt Bleumer
Life of this patent
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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.
Claims20
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 has a built-in expiration.
A system for generating a multiple use ticket method, 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 has a built-in expiration.
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 has a built-in expiration.
Dependencies are inferred from the claim text.