Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1996-07-15
1999-03-30
Barron, Jr., Gilberto
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 30, 705 39, H04L 930, H04L 932
Patent
active
058898620
ABSTRACT:
In a method for implementing traceable electronic cash, a user US sends a bank BK a product N of prime numbers P and Q, a prime number L and his real name ID.sub.U, and the bank BK generates a pseudonym I corresponding to the real name ID.sub.U and keeps the correspondence between the real name ID.sub.U and the pseudonym I secret. The bank BK uses a signature function .OMEGA.=D.sub.eB (N,L,I) to attach a signature to information composed of the above-mentioned N, L and I and sends the user US the signed information .OMEGA. as information containing a license B. The user US generates authentication information X from the N and a random number R and sends the bank BK information Z obtained by performing blind signature preprocessing on information (X,B) with a function F.sub.eC and has the information Z signed by the bank BK with a signature function D.sub.eC (Z) to obtain electronic cash C. When the user US abuses the electronic cash C, the bank BK follows a court order to reveal the correspondence between the real name ID.sub.U and pseudo name of the user US and trace the electronic cash spent.
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patent: 5521980 (1996-05-01), Brands
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David Chaum, et al., Untraceable Electronic Cash, Center for Mathematics and Computer Science, pp. 319-327.
Abe Masayuki
Fujioka Atsushi
Fujisaki Eiichiro
Ohta Kazuo
Barron Jr. Gilberto
Nippon Telegraph and Telephone Corporation
White Carmen D.
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