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…
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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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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 …
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…