Course 5 - Cryptography Quiz

1. Avpr jbex, lbh qrpbqrq guvf!

Hint 1

Look into Caesar Cipher

Hint 2

If this is taking too long, look into a frequency-based strategy

Solution

Using ROT13, you get “Nice work, you decoded this!”

2. ... --- / -.-- --- ..- / -.- -. --- .-- / -- --- .-. ... . ..--..

Hint 1

Morse Code

Solution

"So you know morse?"

3. U28gaG93IGRpZCB5b3UgcmVjb2duaXplIHRoaXMgd2FzIGJhc2U2ND8=

Hint 1

Look at the ‘=’ padding at the end of the string… what might this imply?

Hint 2

Look into base64

Solution

“So how did you recognize this was base64?”

4. Encrypt the message: "HELLO" using a Caesar cipher with a shift of 3

Solution

KHOOR

5. Encrypt the message "WORLD" using a Caesar cipher with a shift of 5

Solution

RJGMY

6. Decrypt the message: "WKLV LV D WHVW PHVVDJH" using a Caesar cipher

Solution

THIS IS A TEST MESSAGE

7. Create a substitution cipher key and encrypt the message: "CRYPTOGRAPHY IS FUN!"

Solution

Variety of solutions

8. Decrypt the message: "XLMRK Z YVIV!"

9. Challenge: Thxk wxll bz kxgnxfxcqntly vorz dxffxcult thqn q ktqndqrd Cqzkqr cxphzr, howzmzr you cqn czrtqxnly fxgurz thxk out. Unlzkk yourz crqey, you czrtqxnly wrotz out kovz codz to fxgurz thxk onz out.

Hint 1

Letters have been switched..but how might you figure out the correct mapping?

Hint 2

Look up the most common letters in English… what approach might you take from here?

Solution

abcdefghijklmnopqrstuvwxyz to qbcdzfghxjslvnoparktumwiye

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Table of Contents

Course 5 - Introduction

Public/Private Encryption

Casear Cipher/RSA Cipher

Python Encryption

Hashing

Cryptographic Attacks

Cryptography Quiz