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…
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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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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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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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On Oct. 28, 2022, 1:29 p.m.
The Syllabary cipher seems to be just another substitution cipher, but is it? Find out and solve its mystery! A key got missing...
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On Oct. 28, 2022, 1:27 p.m.
The Syllabary cipher seems to be just another substitution cipher, but is it? Find out and solve its mystery!
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On Oct. 14, 2022, 5:30 p.m.
The legendary Merkle-Hellman Knapsack cryptosystem can also be used for public-key encryption. Is the cryptosystem secure or can you crack the ciphertext?
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On Oct. 14, 2022, 5:28 p.m.
The legendary Merkle-Hellman Knapsack cryptosystem is not suitable for hiking, but it is considered a pioneer of asymmetric cryptography. Can you crack the cip…
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?
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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?
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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?
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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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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…
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…