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Ring Signature

    Ring signatures conceal the signer’s identity by having them “sign” as a group. The only condition for verification of a ring signature is confirmation that a group member could have signed the message. Anyone within the signing group (each with their own key) can perform the signature, which enables the sender’s anonymity to outsiders while verifying to recipients (who are aware of all potential signers) that one of them signed the message. A ring signature allows a group of users to sign without revealing which member signed it. However, it is not possible to remove an individual’s anonymity. Ring signatures were eventually incorporated into cryptocurrency design and utilized by privacy coins like Monero.