Which application of encryption verifies that a document was sent by the person it says it is from?

The application of encryption that verifies that a document was sent by the person it says it is from is the:

Digital signatures

Explanation:

Digital signatures are a digital scheme/code/or combination of values that help to identify the owner or developer of a certain file. They hid a message and provide a key to be read. They can be found in the majority on suits and they are one of the most common and basic mechanisms of maintaining security in the file. They work with a certain code that preserves the message hidden and then the receiver has to insert that key to verify that the file was not manipulated by someone else.

answerdragging;