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The Crypto Challenge Contest

375
Challenges
14,227
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
Daksh Mamodiya
Daksh Mamodiya

Solved Level 2 challenge Brute-Force-Attack on Triple-DES with Reduced Key Space

CherrySanguine
CherrySanguine

Solved Level 1 challenge Number Sequence

Daksh Mamodiya
Daksh Mamodiya

Solved Level 2 challenge Broadcasting and low exponent — RSA Attack

Daksh Mamodiya
Daksh Mamodiya

Solved Level 2 challenge Alice's Birthday Party (Part 2)

benito255
benito255

Solved Level 1 challenge Number Sequence — Part 9

Tuna T
Tuna T

Solved Level 1 challenge Affine Codes / Modulo Arithmetic with N / Extended Euclid

Tuna T
Tuna T

Solved Level 1 challenge Original Caesar Cipher

cyber9host
cyber9host

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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