Chaumian credentials are about forty years old and still work well, provided your Issuer is willing to bear the cost of running the blind signature protocol for each credential it issues — and that the Resource doesn’t mind verifying a signature for each “show”. Protocols like PrivacyPass implement this using protocols like blind RSA signatures, so presumably these operations cost isn’t prohibitive for real-world applications. However, PrivacyPass also includes some speed optimizations for cases where the Issuer and Resource are the same entity, and these make a big difference.1
One analogy I’ve seen for simple anonymous credentials is to think of them like a digital version of a “wristband”, the kind you might receive at the door of a club. In that situation, you show your ID to the person at the door, who then gives you an unlabeled wristband that indicates “this person is old enough to buy alcohol” or something along these lines. Although the doorperson sees your full ID, the bartender knows you only as the owner of a wristband. In principle your bar order (and your love of spam-based drinks) is untied somewhat from your name and address.
really lists of hyphenated words that are available for free. So even，更多细节参见同城约会
It is in a controlled environment where officers guide users through a system which is still finding its footing. Traditional stations continue to operate, and most citizens still rely on in-person reporting.
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