Blind Signatures

Definition

In blind signature schemes, the sender and the signer of the message are two distinguished entities. Given a message m, blind signatures have the property that the signer digitally signs a blinded version of m, i.e., m′, without the disclosure of any information about the original message. The obtained blind signature can be verified by using the public key of the signer and the original message m, instead of m′.

Key Points

In 1982, David Chaum introduced the concept of blind signatures for protecting user privacy during electronic payment transactions [1]. This scheme has been devised for scenarios where the sender and the signer of the message are two distinguished entities, with the aim of preventing the signer from observing the message he or she signs. More precisely, given a message m generated by A, a signer B is able to digitally sign a blinded version of m′, i.e., DS _B (m′), without the disclosure of any information about the original message. The key property of...