A digital signature is an electronic form of a signature that can be used to authenticate the identity of the sender of a message or the signer of a document, and also ensure that the original content of the message or document that has been sent is unchanged. Digital signatures are easily transportable and cannot be imitated by someone else. The ability to ensure that the original signed message arrived means that the sender cannot easily disclaim it later.
Yes, The signature and encryption certificate should be separate for an individual. The encryption keys are to be generated at the subscriber’s system and should be archived prior to transfer into crypto-medium. The signature keys should be generated in the crypto-medium and should not be copied.Q. Does one require multiple certificates for different application?
No, Ideally, there should not be any requirement for different certificates, however the person holding lower assurance Class 2 certificate may require higher assurance Class 3 certificates for application which demand the same. The higher assurance Class 3 certificates can be used where ever application requires lower assurance certificate. Apart from assurance, depending on the information included in the DSC (For example PAN Number may be required by application) additional certificate may be required.