Preserving the authenticity of the document using quantum techniques

The digital signature is a collection of data in electronic format, attached or associated to an inscription, through which a person attests to be the titular of the rights and obligations from the inscription which he/she takes into possession, and which allows the identification of the signer.In the classical case, if a person generically called Alice uses her private key to sign a message, another person, Bob, can verify if Alice really sent that message only if he knows Alice's public key. Suppose that Alice wishes to apply her own digital signature on a message of her own, made of qutrits. This paper will present an application scheme of quantum signature on an image file.