give yours to someone else you are very unlikely to get it back. ATMs, therefore,
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这就是最早期的“去匿名化”攻击，看似简单，却奠定了现代信息安全的一个核心概念：
We’ve argued that the zero-knowledge paradigm has two advantages over simple Chaumian credentials. First, it’s potentially much more expressive. Second, it allows a User to re-use a single credential many times without needing to constantly retrieve new single-use credentials from the Issuer. While that’s very convenient, it raises a concern we already discussed: what happens if a hacker steals one of these re-usable credentials?
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