Blind signature systems

Cryptography – Particular algorithmic function encoding – Public key

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380 44, 380 28, 380 9, H04L 900

Patent

active

047590637

ABSTRACT:
A cryptographic system allows, in one exemplary use, a supplier to cryptographically transform a plurality of messages responsive to secret keys; the transformed messages to be digitally signed by a signer; and the signed transformed messages returned to the supplier to be transformed by the supplier, responsive to the same secret keys, in such a way that a digital signature related to each original message is developed by the supplier. One important property of these systems is that the signer cannot determine which transformed message received for signing corresponds with which digital signature--even though the signer knows that such a correspondence must exist.

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"Advances in Cryptology Proceedings of Crypto 82", by David Chaum, Ronald L. Rivest and Alan T. Sherman, pp. 199-203, Plenum Press.
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"Proceedings of the 1983 Symposium on Security and Privacy", Technical Committee of Security and Privacy, IEEE Computer Society, Apr. 1983, Oakland, Calif.

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