Explain the term digital signature. What is a digital signature certificate.

Digital Signature: The IT Act states that where any law provides that information shall be in writing or in printed form, the requirement is deemed to be satisfied if such information is in an electronic form and is accessible for subsequent reference. The key ingredients of the formation of electronic contracts comprise communication of offer and acceptance by electronic means, verification of the source of the communication, authentication of the time and place of dispatch and finally the verifiability of the receipt of the data communication. A 'digital signature' may be affixed to authenticate an electronic record. The digital signature serves to satisfy the legal requirement of affixing of a signature in a written or printed document. The Central Government has the power to make rules about the type of digital signature, the manner and format of digital certificate that shall be affixed, control process and procedures to ensure adequate integrity, security and confidentiality of electronic records and payments. Digital Signature Certificate: It certifies the identity of the subscriber and implies his acceptance of the provisions of this act and the rules and regulations contained therein. The certificate is issued only on the following grounds:

1. The Certifying Authority being satisfied that the information contained in the application of certificate is accurate.
2. The subscriber holds a Private Key capable of creating a Public Key.
3. The Private Key corresponds to the Public Key to be listed in the Digital Signature Certificate.
4. The Public Key to be listed in the certificate can be used to verify a digital signature affixed by the Private Key held by the subscriber.

But the certifying authority can revoke a digital signature certificate issued by it, if required.