A _________ is a digital representation of information that identifies you as a relevant entity...

Digital Signature

https://en.wikipedia.org/wiki/Digital_signature

A digital signature is a mathematical scheme for verifying the authenticity of digital messages or documents. A valid digital signature, where the prerequisites are satisfied, gives a recipient very strong reason to believe that the message was created by a known sender (authentication), and that the message was not altered in transit (integrity).