Perspective sketches of the operational buildings dotted around the WOYG (War Office Y Group) site, disguised as Estate buildings at Beaumanor Hall in Leicestershire. They were disguised to avoid Luftwaffe reconnaissance flights during the Second World War.

Site plans for the Whitchurch Y station in Shropshire

The RSS (Radio Security Service) was formed around December 1939 at Wormwood Scrubs. But prior to this the GPO and the War Office had been taking steps to provide the means of identifying illicit wireless transmissions from early 1938. The attached is from a GPO War Diary.

NSIST is kindly sponsored by BAE Systems....BAE Systems provides some of the world's most advanced, technology-led defence, aerospace and security solutions, helping its customers stay ahead of evolving threats across land, sea, air, cyber and space.

The (un)official logo for the WOYG (War Office Y Group) at Beaumanor Hall during the Second World War

This is Beaumanor Hall in Leicestershire, home of the WOYG (War Office Y Group) and one of the main Army SIGINT hubs of the Second World War

Graphic showing the War Office Y Group (WOYG) High Frequency (HF) Direction (DF) network

Manual intercept operator, on duty with the War Office Y Group (WOYG) during the Second World War (from HW41/119)

Julia Parsons, a U.S. Navy code breaker during World War II who was among the last survivors of a top-secret team of women that unscrambled messages to and from German U-boats, has died at 104.

spyscape.com Coming soon....Spyscape is opening its doors in London (Covent Garden), at the end of May 2025

New journal: The Journal of Applied Operational Intelligence is now out. Nine peer-reviewed articles are free to access via www.ubplj.org/index.php/jaoi Thank you to i2 for its kind sponsorship that ensures free access to readers👏👏

The all new 'The_Age_of_AI' exhibition is now open at Bletchley Park

In the late 1920s, Soviet intelligence launched an effort to learn the tradecraft of foreign secret services. www.tandfonline.com/doi/full/10....

Some first thoughts on what newly released MI5 files on John Cairncross tell us about his time as a Soviet agent at Bletchley Park available at siginthistorian.blogspot.com. Some new detail, but there's nothing particularly spectacular.

Coming soon to TNA Kew....

For over a decade, George Busby has become a specialist in the work of the Radio Security Service at the Gilnahirk Wireless Station in Northern Ireland, during the Second World War. The talk is on 20 March. Tickets are at: www.niwarmemorial.org/events/north...

John Young has made public on Cryptome a number of declassified NSA TEMPEST and COMSEC guides and policy notes. 2024-041.7z NSA Releases 49 Declassified Documents on Cryptography, December 31, 2024 (50MB). Link to ZIP archive. cryptome.org/2024/12/NSA-...

The UK has some of the oldest and richest signals intelligence (SIGINT), cyber and communications security heritage in the world. NSIST has been established to preserve it - to protect the past for future generations to inform, research and enjoy. Please check out our website at www.nsist.org