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Algorithms and protocols for creating signatures to documents, and verifying such signatures. These are normally asymmetric, for symmetric signatures see [mac].

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Digital signature that is only verifiable by one specific person

Simply encrypting the signature will not work, because that person could then decrypt and publish the signature and everyone else would be able to verify it. … In my situation, the person verifying the signature has an incentive not to publish their private keys. …
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