Cryptography.
Challenges
Multiple Choice
Which of the following is a one-way function, meaning it cannot be reversed to recover the original input?
A one-way function is easy to compute in one direction but hard to reverse.
✓ Solved!
Multiple Choice
When you see a padlock icon next to a website's URL in your browser, what does it mean?
The padlock icon indicates that the connection is secure and the data is encrypted.
✓ Solved!
Multiple Choice
What is the term for the original, readable message before it has been encrypted?
The original message before it becomes ciphertext.
✓ Solved!
Multiple Choice
During WWII, the Germans used a rotor-based encryption machine that was famously broken by Allied cryptanalysts at Bletchley Park, including Alan Turing. What was it called?
This machine was used by the Germans during WWII and was famously broken by Allied cryptanalysts.
✓ Solved!
Flag Challenge
Decode the following: P2{FCDE}
Something about rotating letters in a well known way...
✓ Solved!
Flag Challenge
Decode the following: Q2{O ghsd id tfca Qosgof}
Something about rotating letters in a slightly different way than before...
✓ Solved!
Flag Challenge
3 % 4 = ?
Basic Modular Arithmetic (no modular inverses/EEA)
✓ Solved!
Flag Challenge
5 % 4 = ?
Basic Modular Arithmetic (no modular inverses/EEA)
✓ Solved!
Flag Challenge
(2 + 2) % 4 = ?
Basic Modular Arithmetic (no modular inverses/EEA)
✓ Solved!
Flag Challenge
(3^0) % 7 = ?
Basic Modular Arithmetic (no modular inverses/EEA)
✓ Solved!
Flag Challenge
(3^1) % 7 = ?
Basic Modular Arithmetic (no modular inverses/EEA)
✓ Solved!
Flag Challenge
(3^2) % 7 = ?
Basic Modular Arithmetic (no modular inverses/EEA)
✓ Solved!
Flag Challenge
(3^3) % 7 = ?
Basic Modular Arithmetic (no modular inverses/EEA)
✓ Solved!
Flag Challenge
(3^4) % 7 = ?
Basic Modular Arithmetic (no modular inverses/EEA)
✓ Solved!
Flag Challenge
(3^5) % 7 = ?
Basic Modular Arithmetic (no modular inverses/EEA)
✓ Solved!
Flag Challenge
(3^6) % 7 = ?
Basic Modular Arithmetic (no modular inverses/EEA)
✓ Solved!
Flag Challenge
(3^7) % 7 = ?
Basic Modular Arithmetic (no modular inverses/EEA)
✓ Solved!
Flag Challenge
Given: p = 4759; q = 3359; Compute N = p * q
The basics of RSA.
✓ Solved!
Flag Challenge
Compute phi = (p - 1) * (q - 1), where phi is Euler's Totient Function
The basics of RSA.
✓ Solved!
Flag Challenge
Given: e = 11; d = 4357463; N = 15953681; Encrypt 42 as (42^e) % N
The basics of RSA.
✓ Solved!
Flag Challenge
Decrypt your answer above as (answer^d) % N
The basics of RSA.
✓ Solved!
File Challenge
Time for some COOKING!
CyberChef seems like a good place to start. Remember, you are decoding (e.g., the REVERSE of encoding).
✓ Solved!
File Challenge
Just this one time...
What is the first rule of One-Time Pads? (Hint: it is in the name...)
✓ Solved!
File Challenge
The Gambler...
What base is possible with dice? What do all bases have in common? Hint: the starting value may not be 1...
✓ Solved!
For More Information
Boxentriq: Cryptography for Beginners
Boxentriq offers a beginner-friendly introduction to cryptography with interactive challenges and tutorials. Students can learn about encryption, decryption, and cryptographic techniques in a hands-on environment.
Visit →The Science of Codes: An Intro to Cryptography
Were you fascinated by The Da Vinci Code? You might be interested in Cryptography! There are lots of different ways to encrypt a message, from early, simple ciphers to the famous Enigma machine. Michael Aranda takes you through a fun and cryptic episode of SciShow, all about codes!
Visit →Cipher Tools: Online Cryptography Playground
Cipher Tools offers CyberChef, an online cryptography playground where students can experiment with various cryptographic operations. They can encode, decode, encrypt, decrypt, and analyze data using different algorithms and techniques in a user-friendly interface.
Visit →