Ultra

Ultra adalah sebuah rancangan yang diadopsi oleh intelijensi militer Britania Raya pada Juni 1941 untuk intelijensi sinyal masa perang yang dilakukan dengan membongkar komunikasi radio dan teleprinter musuh terenkripsi secara tingkat tinggi di Government Code and Cypher School (GC&CS), Bletchley Park. Ultra kemudian menjadi rancangan standar di kalangan Sekutu barat untuk seluruh intelijensi semacam itu.

DAFTAR PUSTAKA 
 
 
 
 
  A short account of World War II cryptology which covers more than just the Enigma story.
 Brzezinski 2005 (missing citation)
 
 
 
  Has been criticised for inaccuracy and exaggeration
 
 
 
 
 
 
  Transcript of a lecture given on Tuesday 19 October 1993 at Cambridge University
 
 
 
 
 
  This is the standard reference on the crucial foundations laid by the Poles for World War II Enigma decryption.
  Focuses on the battle-field exploitation of Ultra material.
 
 
 
 Rejewski, Marian, wrote a number of papers on his 1932 break into Enigma and his subsequent work on the cipher, well into World War II, with his fellow mathematician-cryptologists, Jerzy Różycki and Henryk Zygalski. Most of Rejewski's papers appear in 
 
 
 
  This provides a description of the Enigma, other ciphers, and codes.
 
 
  An early publication containing several misapprehensions that are corrected in an addendum in the 1997 edition.
 
 
  The first published account of the previously secret wartime operation, concentrating mainly on distribution of intelligence. It was written from memory and has been shown by subsequent authors, who had access to official records, to contain some inaccuracies.

Secret Intelligence Service
Bletchley Park