Digital Signature & Cryptographic?

An introduction to Digital Signatures,

Is a message digest used to cryptographically sign a message, digital signatures rely on asymmetric, or public key, cryptography.To create a digital signature, you sign the message with your private key. The digital signature then becomes part of the message.

This has two effects:

• Any changes to the message can be detected, due to the message digest algorithm.
• You can not deny signing the message, because it was signed with your private key.

These two features, message integrity and non-repudiation, make digital signatures a very useful component for e-commerce applications