A digital signature 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.
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Very comprehensive and deep video tutorial explains the principles of what is a digital signature and it advantages for e-commerce applications.
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