Page "Frequency analysis" Paragraph 49

The first known recorded explanation of frequency analysis ( indeed, of any kind of cryptanalysis ) was given in the 9th century by Al-Kindi, an Arab polymath, in A Manuscript on Deciphering Cryptographic Messages.

It has been suggested that close textual study of the Qur ' an first brought to light that Arabic has a characteristic letter frequency.

Its use spread, and similar systems were widely used in European states by the time of the Renaissance.

By 1474 Cicco Simonetta had written a manual on deciphering encryptions of Latin and Italian text.

Arabic Letter Frequency and a detailed study of letter and word frequency analysis of the entire book of Qur ' an are provided by Intellaren Articles.