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Challenge "Hill Cipher"

 On Sept. 4, 2022, 10:11 a.m.

The historical Hill cipher uses matrix-vector multiplications to encrypt blocks of letters. Can you find the inverse matrix and recover the plaintext?
Read mor…

Challenge "Alberti Challenge - Part 2"

 On May 14, 2022, 12:22 p.m.

A more difficult and even more interesting sequel to the "Alberti Challenge - Part 1". Will you manage to crack this puzzle this time as well?
Read more...

Challenge "Alberti Challenge - Part 1"

 On March 26, 2022, 8:45 p.m.

This challenge is about one of the oldest polyalphabetic ciphers. Can you crack this centuries-old puzzle?
Read more...

Challenge "Modified Vigenère Cipher"

 On Jan. 24, 2022, 11:56 a.m.

This cipher is a new take on the well-known Vigenère cipher. It has been designed to fix its "brother's" weaknesses. Can you find another weakness?
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A new look for MysteryTwister

 On Oct. 31, 2021, 2:22 p.m.

Hello everyone,

As many of you might have noticed, our website has become very slow over the last months. These slowdowns were mainly caused by the aging code…

Challenge "The SZ42 Challenge — Part 13"

 On Oct. 6, 2021, 11:51 a.m.

The Lorenz SZ42, codenamed Tunny, was a German teleprinter encryption device used during WW2. This is the last challenge in a series of 13 level-2 challenges w…

Challenge "The SZ42 Challenge — Part 12"

 On Oct. 6, 2021, 11:47 a.m.

The Lorenz SZ42, codenamed Tunny, was a German teleprinter encryption device used during WW2. This is the twelfth challenge in a series of 13 level-2 challenge…

Challenge "SIGABA CSP-2900 — Part 3"

 On July 31, 2021, 6:03 p.m.

The SIGABA CSP-2900 was a highly secure encryption machine used by the US for strategic communication in WWII. In this series of challenges, you are provided w…

Challenge "SIGABA CSP-2900 — Part 2"

 On July 31, 2021, 5:58 p.m.

The SIGABA CSP-2900 was a highly secure encryption machine used by the US for strategic communication in WWII. In this series of challenges, you are provided w…

Challenge "SIGABA CSP-2900 — Part 1"

 On July 31, 2021, 5:47 p.m.

The SIGABA CSP-2900 was a highly secure encryption machine used by the US for strategic communication in WWII. In this series of challenges, you are provided w…

Challenge "SIGABA CSP-889 — Part 3"

 On June 1, 2021, 1:45 p.m.

The SIGABA CSP-889 was a highly secure encryption machine used by the US for strategic communication in WWII. In this series of challenges, you are provided wi…

Challenge "SIGABA CSP-889 — Part 2"

 On June 1, 2021, 1:35 p.m.

The SIGABA CSP-889 was a highly secure encryption machine used by the US for strategic communication in WWII. In this series of challenges, you are provided wi…

Challenge "SIGABA CSP-889 — Part 1"

 On June 1, 2021, 1:18 p.m.

The SIGABA CSP-889 was a highly secure encryption machine used by the US for strategic communication in WWII. In this series of challenges, you are provided wi…

Challenge "Wheatstone Cryptograph — Part 2"

 On May 21, 2021, 3:10 p.m.

The Wheatstone Cryptograph is a simple device that resembles a clock with two hands. For each hand there is a ring of symbols. In this challenge the key is a r…

Challenge "Wheatstone Cryptograph — Part 1"

 On April 21, 2021, 7:17 p.m.

The Wheatstone Cryptograph is a simple device that resembles a clock with two hands. For each hand there is a ring of symbols.

Are you able to decrypt the g…


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