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?
Read more…
Posts
Topics
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?
Read more…
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.…
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.…
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.…
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…
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!
Read more...
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...
Read more...
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...
Read more...
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...
Read more...
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!
Read more...
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?
Read …
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?
Read mor…
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...
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...