An engineer who deceased a few years ago has left behind an unusual painting. Does it contain a message encoded in a binary code?

HistoCrypt 2020 will take place from June 15-17, 2020 in Budapest, Hungary. The Call for Papers is running until February 2.

The Zodiac Killer murdered five or more people and sent four encrypted messages to newspapers. The case and three of the cryptograms have never been solved.

Gerry Haynaly has deciphered the encrypted diary I recently introduced. Here’s how he did it.

Henry Debosnys (1836-1883), a convicted murderer, left behind four cryptograms, which  are unsolved to date. Breaking them could shed light on the many mysteries that surround this case.

Erich Pieper from Hamburg, Germany wrote an encrypted diary from 1928-1931. Can a reader decipher this cryptogram?

Alession Vinci, an Italian student, died in 2019 for unexplained reasons. He left behind an unsolved cryptogram.