Syko Is Broken

Evidence will show that the Stamos crew was carrying cryptographic gear. This gear was given the code name SYKO. It is now evident that the German Naval Communications Intelligence organization was able to read SYKO codes. Though, the date which German intelligence first cracked Syko is unknown.

"10. Other German Cryptanalytic Successes.

In addition to Naval Cipher #3 and #5, the following systems are known to have been read by the German naval Communication intelligence organization:
Various British Naval and Air codes (low grade): including COFOX, MEDOX, FOXO, LOXO, SYKO, Air Force code and Aircraft Movement code. "

The preceeding is quoted from page 72, Item 10., "Other German Cryptoanalytic Successes", 'Battle of the Atlantic, Volume I, Allied Communications Intelligence December 1941-May 1945" (SRH-009), Chapter VI: Compromise of Allied Naval Communications Intelligence (an official publication of Central Security Service, U.S. National Security Agency) as transcribed by the Hyperwar Foundation.

See the entire publication here.