Assignment 8: Cryptography
16 December 2019 
There are two parts to this assignment. Provide the requested answers
and information on (or attached to) a GitLab wiki page called A8 in
your main CS101 repository.
(1) Monoalphabetic cipher
Below are individualized links pieces 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.
When finished, take a picture of your decrypted text, and attach it to your wiki page.
AL 9482 |
text16.crypt.pdf |
AM 6470 |
text23.crypt.pdf |
AM 9063 |
text12.crypt.pdf |
AN 2026 |
text11.crypt.pdf |
AR 8693 |
text09.crypt.pdf |
AW 1120 |
text07.crypt.pdf |
BJ 1758 |
text10.crypt.pdf |
CB 0786 |
text04.crypt.pdf |
CD 7177 |
text04.crypt.pdf |
CF 7260 |
text05.crypt.pdf |
CO 2217 |
text12.crypt.pdf |
EV 1014 |
text06.crypt.pdf |
GA 5341 |
text21.crypt.pdf |
GR 3209 |
text17.crypt.pdf |
HT 4995 |
text20.crypt.pdf |
IP 7121 |
text03.crypt.pdf |
JC 3866 |
text18.crypt.pdf |
JV 2547 |
text14.crypt.pdf |
KB 2597 |
text15.crypt.pdf |
KG 0351 |
text03.crypt.pdf |
KH 8171 |
text08.crypt.pdf |
KR 8920 |
text11.crypt.pdf |
KV 3181 |
text16.crypt.pdf |
LC 5362 |
text22.crypt.pdf |
LF 7631 |
text07.crypt.pdf |
LJ 2323 |
text13.crypt.pdf |
LJ 9222 |
text15.crypt.pdf |
LK 6885 |
text02.crypt.pdf |
MB 1002 |
text05.crypt.pdf |
ML 4201 |
text19.crypt.pdf |
MZ 8853 |
text10.crypt.pdf |
NP 9205 |
text14.crypt.pdf |
OS 1559 |
text09.crypt.pdf |
SA 9088 |
text13.crypt.pdf |
TR 7435 |
text06.crypt.pdf |
VB 0068 |
text02.crypt.pdf |
XW 1354 |
text08.crypt.pdf |
(2) Vigenère cipher
- Choose a password that is 5–8 letters, and write it down.
- Write down a sentence that is about 4–6 times the length of your password.
- Use the polyalphabetic substitution table to encode the sentence using your password.
- Type the encrypted sentence and the password directly into your wiki page (does not need to be an attachment).
- You’ll get full credit for this portion only if I can make sense of your sentence by decrypting using your password. So you may want to give that a test run with a friend: give them your encrypted sentence and password, and see if they get it right.