We can modify our ZK credential to support a limit of N shows as follows. First, let’s have the User select a random key K for a pseudorandom function (PRF), which takes a key and an arbitrary input and outputs a random-looking outputs. We’ll embed this key K into the signed credential. (It’s important that the Issuer does not learn K, so this often requires that the credential be signed using a blind, or partially-blind, signing protocol.3) We’ll now use this key and PRF to generate unique serial numbers, each time we “show” the credential.
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城市是现代化的重要载体，承载着人民对美好生活的向往。如何践行人民城市理念，提高城市规划、建设、治理水平，走出一条中国特色城市现代化新路子？记者采访了3位代表委员。