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The Crypto Challenge Contest

372
Challenges
13,734
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
Piyush Agarwal
Piyush Agarwal

Solved Level 2 challenge AES key — encoded in the machine readable zone of a European ePassport

ThePaPsT
ThePaPsT

Solved Level 1 challenge From Russia with Love

electric ice wolf
electric ice wolf

Solved Level 1 challenge A modified homophonic cipher with reduced alphabets — Part 2

Piyush Agarwal
Piyush Agarwal

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

mr.e
mr.e

Solved Level 1 challenge Number Sequence

mr.e
mr.e

Solved Level 1 challenge The Syllabary Cipher – Part 1

Ratop
Ratop

Solved Level 1 challenge Alberti Challenge — Part 1

mr.e
mr.e

Solved Level 1 challenge A disguised code

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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