A document digital signature is a secure, digital representation of an individual’s identity—like a physical signature. It allows the signer to verify that the content of an electronic document is authentic and hasn’t been tampered with since it was signed. This verification is made possible through a sophisticated system of encryption and decryption technology which uses digital certificates and asymmetric-key cryptography. With a digital signature, companies can sign documents in a fast, cost-effective way that reduces the risk of fraud and enhances security.