This is a very simple Caesar cipher disk. You can turn both wheels individually (or not). You can lock screen orientation, keep screen on, turn on vibrations and play a sound. You can reverse the selected alphabet ("atbash style").
You can choose between :
* latin alphabet,
* hebrew alphabet,
* russian alphabet,
* greek alphabet,
* Eldar Futhark Runes (not supported on some versions of Android !),
* Union Cipher Disk used during the Civil War,
* Alberti Cipher Disk,
* Diana Cipher Disk (Diana Cryptosystem used during Vietnam War : http://www.blogbyben.com/2014/12/trigraphs-diana-pads-and-zombies.html - http://www.creativecrafthouse.com/index.php?main_page=product_info&cPath=143&products_id=1076),
* Vigenère Cipher Disk,
* Beaufort Cipher Disk,
* Custom Cipher Disk - limited to 60 characters per wheel. You can manage 10 custom disks.
You can create a printable version of the current disk, stored in a PDF file (inside the folder "CAESAR CIPHER DISK" of the device's storage). A simple file viewer can be used to view or delete (by a long click) the PDF files.
Note for the Union disk : a long click on the Reset button changes its default configuration.