A8 - Cryptography, due Wed, Dec. 12
in CS 101 on Assignments
Assigned Mon, Dec. 10; Due Wed, Dec. 12 in class;
Complete the worksheets given in class/attached below:
Monoalphabetic cipher
(1)PDF. You are provided a piece of text encoded using a single-substitution (monoalphabetic) cipher. Your task is to crack the code and discover the secret poem. You should start by doing a frequency analysis of the letters in your text.
Vigenère cipher
(2) Using the polyalphabetic substitution table (PDF), encrypt the following messages:
- message:
ATTACKATDAWN, key:LEMON - message:
WEHAVEWON, key:HELLO - message:
HOWAREYOUTODAY, key:FINE
(3) A secret message is encoded with the keyword BLIMP. Work backwards to decrypt HLUQDWPZ. The result should be two actual English words.