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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I'm a cryptographer and professor at Johns Hopkins University. I've designed and analyzed cryptographic systems used in wireless networks, payment systems and digital content protection platforms. In my research I look at the various ways cryptography can be used to promote user privacy.，更多细节参见PDF资料