Identify key issues of cryptography and be able to explain basic cryptographic methods in use today.
Define the uses of digital signatures.
Digital signatures are used to authenticate the sender of a message, and serve as the electronic version of a written signature that can be used to verify the sender of printed correspondence. Along with authentication and nonrepudiation, a digital signature can provide integrity, assuring that the data has not been modified after leaving the sender.
Previously, we discussed how you could encrypt a message using someone's public key to provide confidentiality. The public/private key pair can also be used to authenticate the identity of the message sender. In this ...