What is a digital signature?
A digital signature is normally used in public key cryptography and validates the legitimacy of encrypted data. A digital signature is required to authenticate both the sender of the digital certificate and the authenticity of the certificate.
How does a digital signature work?
Whereas a digital certificate is used to verify the identity of the certificate holder, a digital signature is used to verify the authenticity of a document or message is authentic. A digital signature guarantees the message was not modified by a third party.