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Part of the dispute hinges on the murky legality of large-scale analysis of Americans’ data that is lawful under current U.S. statutes, even if it feels indistinguishable from mass surveillance.
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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.，推荐阅读safew官方下载获取更多信息
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