Signal Intelligence Service

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The Signal Intelligence Service ( SIS for short ) was a secret US military unit that was entrusted with the cryptanalysis of opposing, mainly German, Italian and Japanese messages during World War II . Headquarters was Arlington Hall in Arlington, Virginia .

The SIS was founded in April 1930 by the cryptologist William F. Friedman together with the (then still unknown) math teachers Frank Rowlett , Abraham Sinkov and Solomon Kullback and gradually expanded. In addition to deciphering enemy messages, the SIS was later also responsible for encrypting the US armed forces' own military messages .

The SIS went on September 15, 1945 with the establishment of the United States Army Security Agency (ASA) in this.

literature

  • Paul N. Pfeiffer: Breaking the German Weather Ciphers in the Mediterranean Detachment G - 849th Signal Intelligence Service . Cryptologia , Vol 22 (4), October 1998, pp. 354-369.
  • Joseph S. Schick: With the 849th SIS - 1942–45 . Cryptologia, Vol 11 (1), January 1987, pp. 29-39.

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