11. What is data encryption standard (DES)?
- Block cipher
- Stream cipher
- Bit cipher
- Byte cipher
Answer : A Explanation: Block cipher is the correct answer.
12. The ciphers of today are called round ciphers because they involve
- Double Rounds
- Multiple Round
- Round about
- Single Round
Answer : B Explanation: The ciphers of today are called round ciphers because they involve multiple round.
13. Public key system is useful because
- It uses two keys
- Private key can be kept secret
- There is no key distribution problem as public key can be kept in a commonly accessible database
- It is a symmetric key system
Answer : C Explanation: Public key system is useful because there is no key distribution problem as public key can be kept in a commonly accessible database.
14. In cryptography, the order of letters in a message is rearranged by ________
- Transpositional ciphers
- Substitution ciphers
- Both (A) and (B)
- Quadratic ciphers
Answer : A Explanation: In Transpositional ciphers, the order of letters in a plaintext message is shuffled using a pre-defined method. Some of such ciphers are Rail fence ciphers and columnar transposition and hence, option A is correct.
15. Why did SSL certificate require in HTTP?
- For making security weak
- For making information movefaster
- For sending and receiving emails unencrypted
- For encrypted data sent over http protocol
Answer : D Explanation: For encrypted data sent over http protocol, SSL certificate require in HTTP.
Data Structure MCQ Questions and Answers
16. We use cryptography term to transforming messages to make them
- Secure and immune to idle
- Secure and immune to change
- Secure and immune to defend
- Secure and immune to attacks
Answer : D Explanation: We use cryptography term to transforming messages to make them Secure and immune to attacks.
17. A/an ________ algorithm transforms ciphertext to plaintext
- Encryption
- Decryption
- Both (A) and (B)
- None of the above
Answer : B Explanation: A Decryption algorithm transforms ciphertext to plaintext. So, option B is correct.
18. In symmetric-key cryptography, the same key is used by
- Both Party
- One Party
- Third Party
- Multi Party
Answer : A Explanation: In symmetric-key cryptography, the same key is used by Both Party. So, option A is correct.
19. Symmetric key encryption is also called as?
- Public key encryption
- Private key encryption
- Both (A) and (B)
- None of the above
Answer : B Explanation: Symmetric key encryption is also called as Private key encryption.
20. A public key encryption system
- Allows only the correct sender to decode the data
- Allows anyone to decode the transmission
- Allows only the correct receiver to decode the data
- Does not encode the data before transmitting it
Answer : C Explanation: A public key encryption system allows only the correct receiver to decode the data. Public key encryption, or public key cryptography, is a method of encrypting data with two different keys and making one of the keys, the public key, available for anyone to use. The other key is known as the private key.
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