Used for example:
- by Monero to hide the input of a transaction
- anonymous electronic voting
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A ring signature is a type of digital signature that provides anonymity for the signer within a group of users. Introduced by Cynthia Dwork, Moni Naor, and Omer Reingold in 2001, ring signatures allow a member of a group to sign a message on behalf of the group without revealing which member actually generated the signature. This is achieved by creating a set of possible signers (the "ring") from which the actual signer is selected.