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The Cipher Challenge Contest

376
Challenges
14,538
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
imnotducky.
imnotducky.

Solved Level 1 challenge Letter to the Templars — Part 1

imnotducky.
imnotducky.

Solved Level 1 challenge Caesar Encryption

Patrick Foster
Patrick Foster

Solved Level 2 challenge AES ECB Wrong Encoding

Patrick Foster
Patrick Foster
jgamblin
jgamblin
Emanuele
Emanuele

Solved Level 1 challenge Alberti Challenge — Part 1

electric ice wolf
electric ice wolf

Solved Level 1 challenge The Syllabary Cipher – Part 1

electric ice wolf
electric ice wolf

Solved Level 1 challenge One-Time Pad with Flaws

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: