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zkSNARKs and Programmable Group Signatures
to cover:
sections:
In most cases, credibility and anonymity seem directly at odds. On the one hand, anonymity allows "anons" and "throwaway accounts" on platforms like 4chan and Reddit to speak their minds in ways that they might not otherwise be comfortable with, and enables whistleblowers to publicly disclose corporate or government wrongdoing while mitigating the risk of real-world reprecussions. On the other hand, it is difficult to verify the credibility of statements that are not attached to known or trusted identities, and anonymity can help bad actors who wish to spread misinformation or harrass other community members.
In this post, we present a few techniques for implementing efficient and practical "group signatures." In combination with blockchain identity systems, which
Background
A Simple Protocol
Note that slightly modified versions of this protocol can be used such that
revealSigner
and/ordenySignature
operations are not possible without revealing your secret. For example, to disabledenySignature
, add a salt. To disable revealSignee, don't publish a message attestation.First, via a known identity provider (ie tweets or Ethereum signatures), participants commit to secrets by publishing hashes of their respective secrets.
Circuits
groupSign
revealSigner
denySignature