A digital signature authenticates the sender of a message and provides the electronic equivalent of a tamper-proof seal that is broken if any data in the message were altered. Digital signatures ...

If it is not, you will see a message like one of the following: "The digital signature on this message can't be verified. This message has a digital signature, but it wasn't verified because the ...

A blind signature allows a third party to sign a message and verify that the message came from a particular sender but without them knowing the message contents. See digital signature. THIS ...