Name:_____________________________________

Ms. McGoldrick
Homework 1-CyrptoSystems

1) Encode the following message using a shift with k=5.

Crytography can be fun.

2) Try to break the following message that uses a shift cipher. The key is a secret. What is it?

Qzc Estd Xpddlrd Esp Vpj Td Pwpgpy.

3) Suppose you have a new alpphabet which only conatins the letters a-o. How many possible keys are there? Decode the following message.

L Da Jclbj Kcah.

MODULAR 26 SHEET

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X

Y

Z