digital Signature

THis year I got my form 16 with digital signature. I am told that only form 16 with digital signatures are permitted to submit online filing of incometax returns.

A digital signature different from digital certificateis an electronic signature that can be used to authenticate the identity of the sender of a message or the signer of a document, and possibly to ensure that the original content of the message or document that has been sent is unchanged. Digital signatures are easily transportable, cannot be imitated by someone else, and can be automatically time-stamped. The ability to ensure that the original signed message arrived means that the sender cannot easily repudiate it later.