What is a digital certificate?

One use of trapdoor functions is to encrypt a message so that it can be safely transmitted across an insecure channel. Another use is to allow a sender to sign a message so that the recipient can verify that the sender originated the message and that the message was not altered during transmission. Along with encryption, digital signatures form the basis for secure and trusted communication online.

Credits: Talking: Geoffrey Challen (Assistant Professor, Computer Science and Engineering, University at Buffalo). Producing: Greg Bunyea (Undergraduate, Computer Science and Engineering, University at Buffalo).

Part of the https://www.internet-class.org online internet course. A blue Systems Research Group (https://blue.cse.buffalo.edu) production.