Computer Knowledge · General Awareness

Information Security

4,143 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

Which assumption is not considered in Key Distribution techniques in cryptography?

  1. This approach requires to have a shared key for the sender and the receiver.

  2. Exchange of keys also possible.

  3. It allows the data, without allowing others to see the key.

  4. The secure system can be failure in this technique.

  5. It also works for asymmetric schemas.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Key Distribution techniques is not applicable for asymmetric schemas.

Multiple choice

Which of the following is incorrect about Differential Cryptanalysis attack on DES algorithm?

  1. It uses multiple text blocks.

  2. It performs attack by repeatedly encrypting plaintext pairs with known input XOR.

  3. This technique is not efficient for large number of rounds.

  4. It gives linear equation for key bits.

  5. The differential cryptanalysis attack is complex and provides a complete description.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is incorrect about Differential Cryptanalysis attack. Linear Cryptanalysis attack uses linear equation for key bits.

Multiple choice

Which of the following functionality does S/MIME (Secure/Multipurpose Internet Mail Extensions) algorithm not contain?

  1. It is used for content types and texts messages.

  2. S/MIME supports in many mail agents.

  3. It has signed data to encode messages.

  4. It has encrypted content and associated keys.

  5. It uses digital signatures with DES algorithm.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

S/MIME uses digital signatures with DSS  and RSA algorithms only and not DES.

Multiple choice

Which of the following is incorrect about S/MIME Certificate Processing?

  1. It uses X.509 v3 certificates.

  2. Each client has a list of trusted CA’s certificates.

  3. Each client has own public/private key pairs and certificates.

  4. The certificates must be signed by trusted CA’s.

  5. It verifies the incoming signatures and decrypt outgoing messages.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

It encrypts outgoing messages and not encrypt.

Multiple choice

Which of the following is the incorrect statement about Double-DES?

  1. It uses 2 DES for encryption.

  2. Decryption requires that the keys be applied in reverse order.

  3. It results in a dramatic increase in cryptographic strength for DES.

  4. It uses 2 keys for processing.

  5. It is used to provide the potential vulnerability of DES to a brute force attack.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Double-DES uses a single key that is equivalent to using 2 keys.

Multiple choice

Which of the following is false about Replay Attacks in network security?

  1. It occurs where a valid signed message is copied and later resent.

  2. The message repetition that can be logged.

  3. The message repetition that cannot be detected.

  4. It used sequence numbers for the process.

  5. There is no timestamp defined in this attack.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Timestamp is used for synchronised blocks.

Multiple choice

Which of the following is not a Digital Signature Property?

  1. It must depend on the message signed.

  2. It must be practically save digital signature in storage.

  3. Security depends on sender’s private-key.

  4. The signed message and signature should be encrypted.

  5. The message can encrypt using receivers private-key.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

It can only be encrypted by using receiver's public key.

Multiple choice

Which of the following is false about Symmetric Encryption Approach in cryptography?

  1. It uses a trusted Key Distribution Center (KDC).

  2. Each party shares own master key with KDC.

  3. There is a session keys is maintained between the parties.

  4. The master keys are used to distribute the session keys to both the parties.

  5. This approach is useful for more then two senders.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is incorrect as there can be only one sender and one receiver.

Multiple choice

Which of the following principles applied in the design element of OS is also available for extensive public scrutiny, thereby providing independent confirmation of the design security?

  1. Open design

  2. Least privilege

  3. Ease of use

  4. Authentication of users

  5. Message confidentiality
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This principle applied in the design element of OS is also available for extensive public scrutiny, thereby providing independent confirmation of the design security.