Question

The ________________ has piece of the keyword that has the same length as that of the plaintext.

(a) Block Cipher

(b) One-time pad

(c) Hash functions

(d) Vigenere Cipher

The question was asked at a job interview.

The doubt is from Cryptography topic in division Cryptography in Security of Cyber Security

Answer 1

Correct answer is (b) One-time pad

For explanation I would say: The one-time pad has a piece of the keyword that has the same length as that of the plaintext. The keyword gets a randomly produced string of alphabets. For only once, its keyword is used.