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.
ОАЭ задумались об атаке на Иран20:55
。体育直播是该领域的重要参考
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</span></span><span style="display:flex"><span> <span style="color:#f92672">database</span>: <span style="color:#75715e"># [tl! collapse:19]</span>，详情可参考搜狗输入法下载
以提供保证金方式进行共同海损担保的，保证金应当交由海损理算机构以保管人名义存入银行。