If a person is transferred from one post to another (say in govt. department), the digital signature will also change (yes/no)? Please explain?
Yes. On moving from one department to another, if the procedure in place so demands then the existing Digital Signature Certificate will be revoked and a new one will be required to be issued.
Why is it important that custody of Hardware Cryptographic Device containing the signature creation data should only be with subscriber?
After the issuance of DSC to subscriber by CA, any signature created using the device and verifiable through this DSC is deemed as subscriber’s signature.
Whether Class 3 individual Digital Signature Certificates can be used where class 2 individual Digital Signature Certificates is a requirement?
Can a person have two Digital Signature Certificates - say one for official use and other one for personal use?