Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1994-02-08
1998-01-27
Cangialosi, Salvatore
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 30, H04L 900
Patent
active
057129134
ABSTRACT:
Cryptographic methods and apparatus for payment and related transaction systems are disclosed that allow some kinds of tracing under some conditions and make substantially infeasible other kinds of tracing under other conditions. Examples include: allowing tracing if and only if agreed sets of trustees cooperate; tracing from a payment to the payer by cooperation of a set of trustees; tracing from a payment to the payer without revealing to trustees which payer is being traced or which payment; identifying all payments by a payer provided appropriate trustees cooperate; and identifying all payments by a payer under investigation without trustees learning which payer and/or which payments;
Other examples include: limiting resolution to groups of payers in tracing for statistical purposes; allowing limited different markings of payment instruments while preventing payers from learning which marking they receive; providing for recovery of lost money without compromise of unrelated transactions; allowing participants the ability to retain, not forward, and even destroy some tracing information without financial harm; providing the option of artificial increase in the computational cost of at least some tracing; and providing the option of blurry linking of payments to payers.
REFERENCES:
patent: 4438824 (1984-03-01), Mueller-Schloer
patent: 4458109 (1984-07-01), Mueller-Schloer
patent: 4759063 (1988-07-01), Chaum
patent: 4759064 (1988-07-01), Chaum
patent: 4868877 (1989-09-01), Fischer
patent: 4879747 (1989-11-01), Leighton et al.
patent: 4947430 (1990-08-01), Chaum
patent: 4949380 (1990-08-01), Chaum
patent: 4987593 (1991-01-01), Chaum
patent: 5131039 (1992-07-01), Chaum
patent: 5224162 (1993-06-01), Okamoto et al.
patent: 5276736 (1994-01-01), Chaum
patent: 5276737 (1994-01-01), Micali
patent: 5315658 (1994-05-01), Micali
patent: 5373558 (1994-12-01), Chaum
patent: 5553145 (1996-09-01), Micali
Chaum et al, "Demonstrating Possession of a Discrete Logarithm Without Revealing It", Centre for Mathematics and Computer Science, Kruislaan 413, 1098 SJ Amsterdam, The Netherlands, CRYPTO '86, Springer-Verlag, 1987, pp. 200-212.
Cangialosi Salvatore
DigiCash Incorporated
LandOfFree
Limited-traceability systems does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Limited-traceability systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Limited-traceability systems will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-348255