Al-Kindi's treatise on deciphering cryptographic messages
c. 850 · Work
Al-Kindi describes how to break a substitution cipher by counting how often each letter appears — the earliest known account of frequency analysis.
On these timelines: The Islamic Golden Age, Science & Technology, Master, Arts and Thoughts
More from The Islamic Golden Age
- Islamic Golden Age (750)
- The Graeco-Arabic translation movement (750)
- al-Khwarizmi's al-Jabr (820)
- Ibn al-Haytham's Book of Optics (1021)
- Papermaking spreads west (751)
- Avicenna's Book of Healing (1027)
- Al-Khwarizmi's book on Hindu numerals (825)
- Averroes's The Incoherence of the Incoherence (1180)
Around 850
- An Lushan Rebellion (755)
- Viking Age (793)
- Reign of Alfred the Great (871)
- Khmer Empire (Angkor) (802)
- Reign of Charlemagne (768)
- Abbasid Caliphate founded (750)
- Treaty of Verdun (843)
- Gunpowder developed in China (850)
- Viking raid on Lindisfarne (793)
- Coronation of Charlemagne (800)