Adam Stone writes on technology trends from Annapolis, Md., with a focus on government IT, military and first-responder technologies. Firewalls are no longer sufficient; bad actors have demonstrated ...

The sender’s unique information should be used in a signature; It should be easy to create a signature; It should be impossible to falsify a signature computationally; A signature should be small.

Did you download a large file? Or do you have a file that you have a suspicion about? The best way to ensure the file comes from a verified source is by measuring its checksum. A checksum is almost ...