Digital signature forgery

In a cryptographic digital signature or MAC system, digital signature forgery is the ability to create a pair consisting of a message, $m$ , and a signature (or MAC), $\sigma$ , that is valid for $m$ , but has not been created in the past by the legitimate signer. There are different types of forgery.^[1]

To each of these types, security definitions can be associated. A signature scheme is secure by a specific definition if no forgery of the associated type is possible.

^ Vaudenay, Serge (September 16, 2005). A Classical Introduction to Cryptography: Applications for Communications Security (1st ed.). Springer. p. 254. ISBN 978-0-387-25464-7.

[:0-1] Vaudenay, Serge (September 16, 2005). A Classical Introduction to Cryptography: Applications for Communications Security (1st ed.). Springer. p. 254. ISBN 978-0-387-25464-7.

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