The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 01, 2009
Filed:
Mar. 02, 2005
Sébastien Canard, Caen, FR;
Matthieu Gaud, Courseulles sur Mer, FR;
Jacques Traore, Saint Georges des Groseillers, FR;
Sébastien Canard, Caen, FR;
Matthieu Gaud, Courseulles sur Mer, FR;
Jacques Traore, Saint Georges des Groseillers, FR;
France Telecom, Paris, FR;
Abstract
In a fair blind signature process, a user interacts with a signer in order to complete a 7-tuple (A,e,s,t,x,x,m) such that A=aaaaaa(mod n), where a, a, a, a, aand aand n are elements of the Signer's public key (PUBK). During the signature-issuing phase the user (U) provides the signer (S) with a data element (a) encrypted according to a key (f) known to a trusted authority (TA), and this data element (a) is disclosed during transmission of the signed message. Similarly, the signed message is transmitted associated with second encrypted data comprising a second data element (a) encrypted according to a key (f) known to the trusted authority (TA), and this second data element (a) is disclosed to the Signer during the signature-issuing phase. Thus, the trusted authority (TA) can revoke the anonymity of the digital signature.