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The Cipher Challenge Contest

378
Challenges
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Active members
You like riddles? Then this is your place!
MysteryTwister is a cipher contest, where you can solve cryptographic riddles (challenges) of different difficulty levels. If you are successful, you will be inducted into the Hall of Fame.
Challenges in four levels

Four degrees of difficulty, from pen & paper to complex mathematical problems

Recent solves
Ron Stoner
Ron Stoner

Solved Level 1 challenge Merkle-Hellman Knapsack Challenge - Part 1

Ron Stoner
Ron Stoner

Solved Level 1 challenge Advent-Challenge — Part 1

Ron Stoner
Ron Stoner
Ron Stoner

Solved Level 1 challenge Alberti Challenge — Part 1

Ron Stoner
Ron Stoner

Solved Level 1 challenge New Year's Greetings — Part 2

Ron Stoner
Ron Stoner

Solved Level 1 challenge New Year's Greetings — Part 1

Ron Stoner
Ron Stoner

Solved Level 1 challenge ECDH-Key Exchange for Beginners

Ron Stoner
Ron Stoner

Solved Level 1 challenge Enigma Combinatorics

Learn, Hack & Connect

Solve challenges and connect with other users on Discord

Challenges in four levels

Four degrees of difficulty, from pen & paper to complex mathematical problems

Enter the Hall of Fame

Master challenges in four levels and secure your spot in the Hall of Fame

Start exploring the challenges

Our 7 most solved challenges