# Ring signatures

tags
Cryptography

A ring signature is a protocol that allows a single entity from a group or public-private key pairs to sign a message in such a way that anyone can check the signature was indeed made by someone from that group but it is impossible to tell who exactly. It should also be very hard to create a fake signature without knowing any of the private keys from the group.

The cryptocurrency Monero uses a version of the ring signature protocol to make it very hard to know who was involved in some transaction.