Question

The authentication to be affected by the use of asymmetric crypto system and hash function is known as:

• A. Public key
• B. Private key
• C. Digital Signature
• D. Electronic Governance

Hint:

Think of it like this: Hash Function (creates a unique fingerprint) + Asymmetric Crypto System (locks the fingerprint with a private key) = Digital Signature.

Answer 1

The Correct Option is C

This is the technical definition of a "Digital Signature" as per the Information Technology Act, 2000. The process works as follows: \begin{enumerate} \item A **hash function** creates a unique, fixed-size digital fingerprint (hash) of the electronic record. \item An **asymmetric crypto system** uses a pair of keys: a private key (kept secret by the signer) and a public key (freely available). \item The signer uses their private key to encrypt the hash. This encrypted hash is the **Digital Signature**. \end{enumerate} Anyone can then use the signer's public key to decrypt the signature and verify that it matches the hash of the document, thus authenticating the sender and ensuring the document's integrity.