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The Crypto Challenge Contest

371
Challenges
13,365
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 immortalized in the Hall of Fame.
Challenges in four levels

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

Recent solves
VenDis
VenDis

Solved Level 1 challenge Letter to the Templars — Part 1

apophis
apophis

Solved Level 1 challenge A disguised code

Stephen Thompson
Stephen Thompson

Solved Level 2 challenge Not-so-Secret Message from Malawi — Part I (RSA)

6t41m0ct5
6t41m0ct5

Solved Level 1 challenge Grille Cipher

Stephen Thompson
Stephen Thompson

Solved Level 2 challenge Broadcasting and low exponent — RSA Attack

george_k
george_k

Solved Level 1 challenge Number Sequence — Part 3

george_k
george_k

Solved Level 1 challenge Number Sequence — Part 2

george_k
george_k

Solved Level 1 challenge Original Caesar Cipher

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:
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