Question

Gronsfeld cipher is an example of _____________

(a) mono-alphabetic cipher

(b) poly-alphabetic cipher

(c) transposition cipher

(d) additive cipher

I have been asked this question in my homework.

The query is from Cryptography in chapter Cryptography of Data Structures & Algorithms II

Answer 1

Correct choice is (b) poly-alphabetic cipher

To explain: Gronsfeld cipher is a substitution cipher. It falls under the category of poly alphabetic cipher as it uses multiple substitutions at different positions in order to cipher the plain text.