Chaum’s original constructions produce single-use credentials, based on a primitive known as a blind signature scheme. Blind signatures are a variant of digital signatures, with an additional protocol that allows for “blind signing” protocol. Here a User has a message they want to have signed, and the Server holds the signing half of a public/secret keypair. The two parties run an interactive protocol, at the end of which the user obtains a signature on their message. Most critically, the server learns nothing about the message that it signed.
SNi ≠ PRF(K, bsni), using the User’s key K.。关于这个话题，夫子提供了深入分析
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到村民小钱家时，问及用水情况，小钱表示：“最近一两个月确实看到别人家有水，但因为之前一直没有水，自己家阀门一直是关的”。小钱还说，自己家距离公用机井较近，自备井的水位受到了影响，年后准备再花钱打一口新井。