World Library  
Flag as Inappropriate
Email this Article
 

Ahmad al-Qalqashandi

Shihab al-Din abu 'l-Abbas Ahmad ben Ali ben Ahmad Abd Allah al-Qalqashandi (1355 or 1356 – 1418) was a medieval Egyptian writer and mathematician.

Born in a village in the Nile Delta, al-Qalqashandi was scribe of the scroll (katib al-darj) in the Mamluk chancery in Cairo. He is the author of Subh al-a 'sha, completed in fourteen volumes in 1412, "one of the final expressions of the genre of Arabic administrative literature".[1]

The Subh al-a 'sha included a section on cryptology. This information was attributed to Ibn al-Durayhim who lived from 1312 to 1361, but whose writings on cryptology have been lost. The list of ciphers in this work included both substitution and transposition, and for the first time, a cipher with multiple substitutions for each plaintext letter. Also traced to Ibn al-Durayhim is an exposition on and worked example of cryptanalysis, including the use of tables of letter frequencies and sets of letters which can not occur together in one word.

References

  1. ^ Maaike van Berkel (2009). "al-QALQASHANDĪ". In Roger M. A. Allen; Terri DeYoung. Essays in Arabic Literary Biography II: 1350-1850. Otto Harrassowitz Verlag. pp. 331–40.  

External links

Further reading

  • Christian and Jewish Religious Dignitaries in Mamluk Egypt and Syria: Qalqashandi´s Information on their Hierarchy, Titulature, and Appointment (I &II) International Journal of Middle East Studies, 3:1, 3:2 (1972)
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.