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Even though both are group-oriented and protect user anonymity, group and ring signatures differ in several ways. For instance, although both schemes provide user anonymity, group signature schemes have revocable user anonymity, and ring signatures have non-revocable user anonymity.

Multisignature: A multisignature represents a certain number of signers signing a given message. Number of signers is not fixed and signers identities are evident from a given multi-signature. A multisignature is much shorter (sometimes constant) than the simple collection of individual signatures.

Ring signatures are similar to group signatures but differ in two key ways: first, there is no way to revoke the anonymity of an individual signature; and second, any set of users can be used as a signing set without additional setup.

In contrast to group signature, ring signatures provide permanent user anonymity. Moreover, in ring signatures, users are not fixed to a group. A signer forms an ad-hoc group with selected users when publishing a message. The signer employs other users' public keys without their consent to hide his identity.

Understanding Ring Signatures In a ring signature scheme, a group of potential signers is created. Each member of the group generates a public-private key pair. These public keys are made available to the public, while the private keys are kept secret.

A group signature scheme is a method for allowing a member of a group to anonymously sign a message on behalf of the group. The concept was first introduced by David Chaum and Eugene van Heyst in 1991.

A ring signature enables an individual of a group to sign a message on behalf of the group without revealing the identity of the real signer. It is useful in the application of leaking authoritative secrets in an anonymous way.