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.
RAC recognizes the evolving nature of communications technology, however any transition away from dedicated broadcast alerting services must ensure that no Canadians are left without timely access to critical warnings. Redundancy in emergency communications systems is not a luxury – it is a necessity.
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Author(s): Junwei Che, Xuezhi Wang，详情可参考服务器推荐
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