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Revocable credentials. Another approach is to build credentials that can be revoked in the event of bad behavior. This requires a procedure such that when a particular anonymous user does something bad (posts spam, runs a DOS attack against a website) you can revoke that specific user’s credential — blocking future usage of it, without otherwise learning who they are.
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In one young couple's diary given to them for the project, Sumaira describes her partner coming home, the dinner she has cooked, the hug in the hallway, the two of them eating together at the table.
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