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Get Jefferson Disk old version APK for Android
Fully interactive and configurable version of Thomas Jefferson's cipher disk
Features
✓ Interactive cipher wheel
✓ Fully configurable
✓ Share configuration with others
✓ Presets (M94, Jefferson-36)
Historic Background
Thomas Jefferson (1743-1826), the third President of the United States, is credited with the invention of one of the most advanced cryptographic devices of his time, the so-called wheel cypher.
Devised in the early-to-mid 1790s while Jefferson served as the US Secretary of State, it consisted of a system of 36 interchangeable wooden disks revolving around a central spindle, with each disk imprinted randomly with the 26 letters of the English alphabet. With the device, a 36-letter message could be encoded on one row formed by the disks and then one of the 25 remaining rows of the disk shared with a correspondent having an identical wheel cypher and a key to the order of the spindle disks.
In the late-1800s, the same system of disks was independently invented by Etienne Bazeries, a French military cryptanalyst, and subsequently formed the basis of the M-94 cipher machine used widely by US armed forces beginning in the early 1920s until the early 1940s.
Today, in addition to surplus US M-94 cipher machines collected by amateur cryptologists worldwide, a popular 12-disk, 27-character version of the Jefferson wheel cypher is sold as a wooden educational toy by the gift shops of a number of early American historical sites, including Thomas Jefferson's Monticello.
Last updated on Feb 5, 2023
Minor bug fixes and improvements. Install or update to the newest version to check it out!
Uploaded by
Sayyog Parthe
Requires Android
Android 4.1+
Category
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Jefferson Disk
Cipher wheel1.0.0 by Philipp Kutsch
Feb 5, 2023