The Dorabella cipher is comprised of a note sent by the English composer Sir Edward Elgar at the end of the 19th century to a young female friend named Dorabella .... the cipher has resisted all attempts at decryption and remains unsolved to this day.

For details of the cipher itself and what is known about the circumstances surrounding it, check out http://www.geocities.com/Vienna/4056/cipher.html

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