Computer Knowledge · General Awareness

Information Security

4,634 Questions

Information security involves protecting computer systems and data from unauthorized access, cyber threats, and damage. It is a core part of the computer knowledge section in various banking and government exams. Practicing these concepts helps in understanding digital signatures, network security, and access control effectively.

Cybersecurity threatsAccess controlCryptography basicsSecurity risk managementDatabase protection

Information Security Questions

Multiple choice

What is the function of the public key out of the pair of keys used in an electronic signature?

  1. To create an electronic signature

  2. To verify an electronic signature

  3. To create and verify an electronic signature

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Using a public key is to authenticate that a message originated with a holder of the paired private key; or to encrypt a message with a public key to ensure that only the holder of the paired private key can decrypt it.

Multiple choice

Which of these functions of public and private keys is correct?

  1. Private key verifies the digital signatures and public key creates the digital signature.

  2. Public key verifies the digital signatures and private key creates the digital signature.

  3. Private key and public key are used to verify the digital signatures.

  4. Private key and public key are used to create the digital signatures.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A digital signature in its simplest description is a hash of the data that is subsequently encrypted with the signer's private key. Since that is something only the signer has, that is where the trust comes from. EVERYONE has access to the signer's public key. So, to validate a digital signature, the recipient (1) calculates a hash of the same data, (2) decrypts the digital signature using the sender's PUBLIC key, and (3) compares the 2 hash values. If they match, the signature is considered valid. If they don't match, it either means that a different key was used to sign it, or that the data has been altered. Thus, public key helps in verification. The private key is used to encrypt the hash. The encrypted hash along with other information, such as the hashing algorithm, is the digital signature. Thus, it helps in creating the electronic signature.

Multiple choice

What is/are the function(s) of the private key, out of the pair of keys used in an electronic signature?

  1. To create an electronic signature

  2. To verify an electronic signature

  3. To create and verify an electronic signature

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The private key is used to encrypt the hash. The encrypted hash along with other information, such as the hashing algorithm, is the digital signature. Thus, it helps in creating the electronic signature.