CS Professional · Artificial Intelligence, Data Analytics and Cyber Security - Laws and Practice · Network Basics and Security
Which statement best describes how a digital signature on an electronic document is created and verified under the usual asymmetric scheme recognised by the Information Technology Act, 2000?
A digital signature is made by hashing the document and encrypting that hash with the signer's private key. The verifier decrypts it with the signer's public key and compares it to a newly computed hash. A match shows the document is unaltered and came from the signer.
- AA hash of the document is encrypted with the signer's private key, and the verifier decrypts it with the signer's public key and compares hashesCorrect
- BThe whole document is encrypted with the verifier's public key and the verifier decrypts it with the signer's public key
- CA hash of the document is encrypted with the verifier's private key and checked using the signer's private key
- DThe document is encrypted with a shared symmetric key which both parties publish on the Certifying Authority's website
Explanation
The signer computes a hash (message digest) and encrypts it with the signer's private key. The verifier decrypts with the signer's public key and compares it with a freshly computed hash; a match proves integrity and origin. The other options mix up keys or use symmetric keys, which cannot give non-repudiation.
Did you get it right without looking?
One question tells you little. A timed set on Network Basics and Security shows your real accuracy, how long you take and where you lose marks.
More Network Basics and Security questions
- A company wants a security control that sits between its internal network and the internet and permits or blocks traffic based on a predefin…
- A director receives a PDF of minutes bearing a valid digital signature from the Chairman. Later, one word in the PDF is altered by an unknow…
- In a client-server network of a Mumbai firm, a central machine stores the company's files, authenticates users and serves requests from empl…
- Under the Information Technology Act, 2000 as taught for this paper, which body is the national nodal agency for responding to computer secu…
- The security team of Bharat Textiles Ltd. deploys a system that monitors network traffic, compares it with known attack signatures and autom…
- A firm's employees in Chennai connect laptops to the office network through wireless access points, and the IT head wants to prevent a forme…