A TCS Digital Signature Certificate Class 3, like hand written signature, establishes the identity of the sender filing the documents through the internet, which the sender cannot revoke or deny. It is a set of encrypted data used with the same validity of a paper signature, but on emails, electronic documents and online transactions. Digital signatures are the online equivalent of the physical signature that you use to authenticate communication, transactions, agreements, etc. In its pure form, a digital signature is software residing on your personal computer, notebook, or email-capable handheld. What it does is to encrypt and identify electronic documents on your behalf; deeming it secured, authentic and legally valid. Thanks............http://www.esolutions.net.in