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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…

Re: Challenge

 On Jan. 30, 2021, 3:57 p.m.

We have updated the challenge to explicitly mention the starting positions for the CHI wheels to make the solution unique.
Thanks @george4096 and @Yokozuna fo…

Challenge "The SZ42 Challenge — Part 11"

 On Jan. 30, 2021, 3:48 p.m.

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

Challenge "The SZ42 Challenge — Part 10"

 On Dec. 26, 2020, 6:32 p.m.

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

Challenge "Find the right route — Part 3"

 On Dec. 26, 2020, 6:24 p.m.

This series deals with a grid — a basic tool cryptographers use to separate sequences of data into columns and rows. In this challenge you are given three grid…


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