Among the many unsolved historical ciphers, one mystery that I find particularly intriguing is the Ohio Cryptogram. More than a century after its publication, this encrypted message remains unsolved.
The Ohio Cryptogram is linked to a robbery that took place at a Western Ohio Railway ticket office in Lima, Ohio, on June 27, 1916.
The Ohio ticket-counter robbery — Source: AI-generated
A few days after the crime, the local newspaper Lima Times-Democrat published an encrypted message and appealed to its readers for help in deciphering it. Later reports revealed that the cryptogram was somehow connected to the robbery, although the exact nature of this connection remains unknown to this day. The cryptogram reads as follows:
Was nvivaft by aakat txpxsck upbk txphn ohay ybtx cpt mxhg wae sxfp zavfz ack there first txlk week wayx za with thx
A more detailed account of the Ohio Cryptogram can be found on here.
I first learned about this crypto mystery through Nick Pelling’s Cipher Mysteries blog. In 2013, Nick published an article about the Ohio Cryptogram. Despite numerous attempts over the years, the Ohio Cryptogram remains unsolved. More than ten years have passed since Nick Pelling highlighted the mystery, yet no convincing solution has emerged. In a field where even centuries-old ciphers are occasionally cracked, this small 1916 message continues to resist analysis.
Perhaps the key to the solution is still waiting to be discovered in an overlooked newspaper archive, a forgotten police report, or a fresh cryptanalytic approach. Until then, the Ohio Cryptogram remains one of the lesser-known but most fascinating unsolved cipher mysteries.
If you have any thoughts on the Ohio Cryptogram, please leave a comment.
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