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Digital Signature and Digital Certificate

A digital signature is an electronic method of signing an electronic document whereas a Digital Certificate is a computer based record which

1. Identifies the Certifying Authority issuing it.

2. Has the name or the identity of its subscriber.

3. Contains the subscriber's public key.

4. Is digitally signed by the Certifying Authority issuing it.

Digital Signatures provide Authentication, Privacy, Non repudiation and Integrity in the virtual world . IT Act 2000 in India gives legal validity to electronic transactions that are digitally signed. Therefore we need digital signatures for secure messaging, online banking applications, online workflow applications, e-tendering, supply chain management etc.

Digital Certificates are digital documents attesting to the binding of a public key to an individual or specific entity. They allow verification of the claim that a specific public key does in fact belong to a specific individual. Digital Certificates help prevent someone from using a phony key to impersonate someone else.

In their simplest form, certificates contain a public key and a name. As commonly used, a certificate also contains an expiration date, the name of the Certifying Authority that issued the certificate, a serial number etc. Most importantly, it contains the digital signature of the certificate issuer.

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