Editing Playfair cipher (section)

== Superseded ==
Playfair is no longer used by military forces because of known insecurities and of the advent of automated encryption devices. This cipher is regarded as insecure since before [[World War I]].

The first published solution of the Playfair cipher was described in a 19-page pamphlet by Lieutenant [[Joseph O. Mauborgne]], published in 1914.<ref>{{cite book |last=Mauborgne |first=Joseph Oswald |author-link=Joseph Mauborgne |date=1914 |title=An Advanced Problem in Cryptography and Its Solution |url= |location=Fort Leavenwoth, Kansas |publisher=Army Service Schools Press |page= |isbn=}}</ref> [[William Friedman]] described it in 1942 as providing very little security.<ref>{{cite book |url=https://www.nsa.gov/Portals/75/documents/news-features/declassified-documents/friedman-documents/publications/FOLDER_267/41784809082383.pdf |title=American Army Field Codes In the American Expeditionary Forces During The First World War |last=Friedman |first=William |author-link=William F. Friedman |date=June 1942 |publisher=U.S. War Department |access-date= |page=4}}</ref>