Question

______________ employs a text string as a key that is implemented to do a series of shifts on the plain-text.

(a) Vigenere Cipher

(b) Shift Cipher

(c) Playfair Cipher

(d) Block Cipher

I have been asked this question in final exam.

This is a very interesting question from Cryptography in portion Cryptography in Security of Cyber Security

Answer 1

The correct choice is (a) Vigenere Cipher

Explanation: Vigenere Cipher employs a text string as a key that is implemented to do a series of shifts on the plain-text. Here the sender & the receiver settle on a single key.