Lee-Cryptogram-bar

In April 1862 Civil War general Robert E. Lee received an encrypted note from a Joseph E. Johnston. According to the library that owns this document, the encryption is unsolved.

Postcard-Stand-Rock-bar

A postcard from 1909 bears an encrypted message and an unusual spelling of a remarkable rock. Can a reader solve these mysteries?

Powers-Cryptogram-bar

The best-selling novel “The Gold Bug Variations” from 1991 contains an encrypted dedication. It has never been deciphered.

Acrostic-Kammen-bar

Daniel Kammen, energy advisor of US president Donald Trump, has hidden an acrostic in his letter of resignation. He’s not the first one to do so.

Acrostic-2-bar

My blog post about acrostics (especially about one in a letter of resignation from a presidential advisory committee) has been quite popular among my readers. Here are a few more acrostics.

Trump-Acrostic-bar

Acrostics are a data hiding technique that has been in use for centuries. The latest example is contained in a letter of resignation written by a US committee last week.

SG-41-DM-PM-bar

The SG-41, also known as Hitler Mill, was the successor of the Enigma encryption machine. Detectorists have now found a specimen in a Bavarian forest.

Copenhagen-cryptogram-bar

For decades, members of the American Cryptogram Association have tried to decipher an encrypted note found in Denmark – but to no avail.

Erba-Murder-bar

In 2006 a couple from Erba, Italy, murdered four neighbors. An encrypted letter from this criminal case is still waiting to be solved.

Fringe-Code-2-bar

“Fringe”, a successful US TV series, contains a hidden code. It has been solved by fans of the series.