Encryption and Decryption Quiz - CBSE Class 12 ICT

Free practice quiz: Encryption and Decryption (CBSE Class 12 ICT). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which of the following is NOT a type of encryption?

   1. Symmetric-key encryption
   2. Asymmetric-key encryption
   3. Hashing
   4. Decryption
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   Answer: D. Decryption

   Decryption is the process of reversing encryption, not a type of encryption itself.

2. What is the purpose of a hashing algorithm in cryptography?

   1. To encrypt data.
   2. To decrypt data.
   3. To create a one-way function that produces a unique 'fingerprint' of data.
   4. To digitally sign documents.
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   Answer: C. To create a one-way function that produces a unique 'fingerprint' of data.

   Hashing algorithms are used for data integrity verification and password storage, not for encryption or decryption.

3. Discuss the vulnerabilities of symmetric encryption and how they can be mitigated.

   1. Vulnerabilities include key distribution and key management. Mitigation involves using key exchange protocols and secure key storage.
   2. Vulnerabilities are non-existent. Mitigation is not required.
   3. Vulnerabilities include only key distribution. Mitigation involves secure key storage.
   4. Vulnerabilities include only key management. Mitigation involves using key exchange protocols.
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   Answer: A. Vulnerabilities include key distribution and key management. Mitigation involves using key exchange protocols and secure key storage.

   Symmetric encryption's reliance on a single shared key makes key distribution and management crucial security considerations.

4. Describe the process of encrypting and decrypting a message using a symmetric key.

   1. The sender uses the key to encrypt the message, and the receiver uses the same key to decrypt it.
   2. The sender uses a public key to encrypt, and the receiver uses a private key to decrypt.
   3. The sender uses a private key to encrypt, and the receiver uses a public key to decrypt.
   4. Encryption and decryption are not related.
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   Answer: A. The sender uses the key to encrypt the message, and the receiver uses the same key to decrypt it.

   This question tests the student's basic understanding of symmetric key encryption.

5. Explain the concept of a digital certificate and its purpose.

   1. A digital document that verifies the identity of a website or individual.
   2. A physical certificate issued by a government agency.
   3. A type of encryption algorithm.
   4. A document that proves a user's ownership of a specific computer.
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   Answer: A. A digital document that verifies the identity of a website or individual.

   Understanding digital certificates is vital for secure online transactions.

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