在梳理动态磁贴文章资料的时候时,我忽然意识到自己已经很多年没有真正摸过一台 Windows Phone 设备了,于是我在二手平台上买回了一台 Lumia 1020。
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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