Early Cryptosystems

Question 1

Mono-alphabetic substitution cipher that makes use of mapping plaintext characters to graphical characters

Answer 1

Pigpen

Question 2

Employs a method to scramble text by writing it in a sequence across a number of rails

Answer 2

Rail code

Question 3

Makes use of a grid and maps the letters to numeric values

Answer 3

BIFID

Question 4

5x5 matrix containing alphabet less the letter J. Consists of a set of rules outlining use of column and row combinations

Answer 4

Playfair

Question 5

Mono-alphabetic substitution known as shift cipher

Answer 5

Caesar

Question 6

Polyalphabetic cipher that involves using a different mapping based on a keyword for each character of the cipher

Answer 6

Vigenere

Question 7

Uses four 5x5 matrices arranged in a square, where each matrix contains 25 letters for encoding and decoding operations

Answer 7

Four-square cipher