Name:
Assignment 4
1. (20 points)
a. Using a ROT5 cipher encrypt the following plaintext. Prove your answer by showing the steps for both the encryption and decryption.
Meet at the baseball field at three oclock
Answer
b. Using a ROT3 cipher decrypt the following ciphertext. Prove your answer by showing the steps for both the encryption and decryption.
WKHF RUYH WWHL VUHG
Answer
2. (10 points)
Following are two problems using a rail fence cipher. Prove both of your answers by showing the steps involved in encryption/decryption. As part of this problem you must also show the steps involved in reversing what you are being asked for.
a. Using a rail fence cipher with key = 3 encrypt the following message:
The bird is a raven
Answer
b. Reverse the steps to decrypt your answer and explain the steps.
Answer
3. (10 points)
Rail fence cipher. Prove both of your answers by showing the steps involved in encryption/decryption. As part of this problem you must also show the steps involved in reversing what you are being asked for.
a.