UNSOLVED PROBLEMS 
In Number Theory, Logic, and Cryptography 
Dorabella Cipher 
The Dorabella cipher is contained in a note written by the English composer Sir Edward Elgar to a young lady companion, Dora Penny, in 1897. The cipher remains unsolved to this day.
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The problem is to solve the cipher..
For further information, please see: [1] http://en.wikipedia.org/wiki/Dorabella_Cipher [2] http://www.puzzlehead.org/2009/05/unsolvedmysteriesthedorabellacipher [3] http://www.cryptologicfoundation.org/content/EducationalPrograms/BooksandThings.shtml
The Dorabella Cipher has now been solved. See items 12 and 36 on the Solutions page.
——————————– This web site developed and maintained by Tim S Roberts Email: timro21@gmail.com
* There are currently 2 proposed solution on the solutions page.
