1. A method of authenticating an object, the method including: sensing coded data provided on or in a surface associated with the object, the coded data being indicative of: an identity of the object; and, at least part of a signature, the signature being a digital signature of at least part of the identity; and, determining, using the sensed coded data, a sensed identity and a sensed signature part; determining, using the sensed identity, at least a determined signature part; comparing the determined signature part to the sensed signature part; and, authenticating the object using the results of the comparison.