Returned-value blind signature systems

Details Returned-value blind signature systems Returned-value blind signature systems

1988-10-20

1990-08-14

Buczinski, Stephen C.

Cryptography

Particular algorithmic function encoding

Public key

380 28, H04L 930

Patent

active

049493809

ABSTRACT:
A payer party obtains from a signer party by a blind signature system a first public key digital signature having a first value in a withdrawal transaction; the payer reduces the value of the first signature obtained from the first value to a second value and provides this reduced-value form of the signature to the signer in a payment transaction; the signer returns a second digital signature to the payer by a blind signature system in online consummation of the payment transaction; the paper derives from the first and the second signature a third signature having a value increased corresponding to the magnitude of the difference between the first and the second values. Furthermore, the following additional features are provided: payments are unlinkable to withdrawals; a shop between the payer and signer can be kept from obtaining more value than desired by the payer; the first value need not be revealed to the signer or intermediary in the payment transaction; the returned difference can be accumulated across multiple payment transactions; and the returned difference can be divided between a plurality of payment transactions.

REFERENCES:
patent: 4759063 (1988-07-01), Chaum
patent: 4759064 (1988-07-01), Chaum

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