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Challenge "Elliptic Boogaloo – Part 2"

 On Jan. 15, 2024, 9:06 p.m.

Ready for the second Elliptic Boogaloo? In this challenge, we dance on elliptical curves and try to forge digital signatures. But some hints went missing. Can …

Challenge "Elliptic Boogaloo – Part 1"

 On Nov. 27, 2023, 3:13 p.m.

Ready for the Elliptic Boogaloo? In this challenge, we dance on elliptic curves and try to forge digital signatures.
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Challenge "A disguised code"

 On Oct. 31, 2023, 9:27 a.m.

This challenge is a puzzle about a mysterious ciphertext, which is also protected by a clever disguise. Can you crack it?
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Challenge "The Hutton Cipher – Part 5"

 On Oct. 16, 2023, 11:07 a.m.

An English plaintext of length 4272 was encrypted with the Hutton cipher, a pen-and-paper cipher from 2018. The length of the two passwords is also known. Can …

Challenge "The Hutton Cipher – Part 4"

 On Sept. 6, 2023, 10:49 a.m.

Unlock the secrets of the Hutton cipher, a pen-and-paper cipher from 2018. Can you crack the ciphertext?
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Challenge "The Hutton Cipher – Part 3"

 On July 21, 2023, 11:08 a.m.

Unlock the secrets of the Hutton cipher, a pen-and-paper cipher from 2018. Can you crack the ciphertext?
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Challenge "The Hutton Cipher – Part 2"

 On June 5, 2023, 2:27 p.m.

Unlock the secrets of the Hutton cipher, a pen-and-paper cipher that has baffled cryptographers since 2018. Can you reconstruct the keywords used?
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Challenge "The Hutton Cipher – Part 1"

 On May 2, 2023, 4:11 p.m.

Unlock the secrets of the Hutton cipher, a pen-and-paper cipher that has baffled cryptographers since 2018. Can you crack the ciphertext?
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Challenge "The Josse Challenge – Part 3"

 On March 27, 2023, 10:05 a.m.

The Josse cipher is a polyalphabetic cipher from the time of the Franco-Prussian War. Its description was lost. It was only rediscovered and published in 2020.…

Challenge "The Josse Challenge – Part 2"

 On Feb. 25, 2023, 1:29 a.m.

The Josse cipher is a polyalphabetic cipher from the time of the Franco-Prussian War. Its description was lost. It was only rediscovered and published in 2020.…

Challenge "The Josse Challenge – Part 1"

 On Feb. 10, 2023, 8:47 a.m.

The Josse cipher is a polyalphabetic cipher from the time of the Franco-Prussian War. Its description was lost. It was only rediscovered and published in 2020.…

Challenge "A Heavy SZ42 Challenge – Part 14"

 On Dec. 30, 2022, 12:59 p.m.

The Lorenz SZ42, codenamed Tunny, was a German teleprinter encryption device used during WW2. This is the fourteenth challenge in a series of 16 level-3 challe…

Challenge "The Syllabary Cipher -- Part 5"

 On Oct. 28, 2022, 1:34 p.m.

The Syllabary cipher seems to be just another substitution cipher. This time, the table got mixed up. Is a solution even possible? Find it out!
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Challenge "The Syllabary Cipher -- Part 4"

 On Oct. 28, 2022, 1:32 p.m.

The Syllabary cipher seems to be just another substitution cipher, but is it? Find out and solve its mystery! All keys went missing...
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Challenge "The Syllabary Cipher -- Part 3"

 On Oct. 28, 2022, 1:30 p.m.

The Syllabary cipher seems to be just another substitution cipher, but is it? Find out and solve its mystery! But this time, the table is weird...
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