GCHQ

The UK's intelligence, security and cyber agency, helping to keep the UK safe online and in the real world. Follow the cyber security arm of our mission @NCSC.

[GCHQ @GCHQ]

Only the persistent can solve this one, are you one of them?🕵️‍♀️

Let us know how you get on with your weekly #GCHQPuzzle in the comments below.

[Ministry of Defence 🇬🇧 @DefenceHQ]

Warfare is changing. It's why we're making the largest ever drone investment in our Armed Forces.

🚢 Autonomous submarine hunting frigates
✈️ Drone "wingmen" to fly alongside Apaches
💥 Thousands of low-cost kamikaze strike drones
🛰️ Surveillance drones to replace older systems

[NCSC UK @NCSC]

Whilst frontier AI can ultimately benefit our cyber defences, in the immediate term it is making it easier and faster for attackers to discover and exploit cyber weaknesses. Organisations should take these 5 urgent steps to maintain cyber security fundamentals:🧵

[NCSC UK @NCSC]

With our Five Eyes partners, we have published a joint statement warning organisations they have months - not years - to protect their systems from the accelerating cyber threat driven by frontier AI.🧵

To read the full statement⬇️
https://t.co/bxh0W4smpM

[GCHQ @GCHQ]

In May, Director GCHQ Anne Keast-Butler delivered our first ever annual lecture from our wartime home at Bletchley Park.

Find out more here ⬇️
https://t.co/gw3jvcoU1s

[GCHQ @GCHQ]

The iconic 'doughnut'. It's been our home for over 20 years, but did you know when GCHQ Cheltenham was built, it was Europe's biggest construction operation?! 🤯

[NCSC UK @NCSC]

“Cyber security is a continuous national contest with capable adversaries, requiring urgent, coordinated action across government, industry and individuals to strengthen resilience.” - NCSC CEO Dr Richard Horne delivering RUSI’s Annual Security Lecture this afternoon.

[GCHQ @GCHQ]

This week’s #GCHQPuzzle challenge starts now 🔐

Drop your answers below, let's see who gets it right first. 🧠

[GCHQ @GCHQ]

📺 GCHQ Historian Dr David Abrutat features in 'Secrets and Lies', an episode of @tomhanks' epic new series 'WWII with Tom Hanks' on @SkyHistory @Nutopia - airing this evening.

[GCHQ @GCHQ]

How did you fare with this week's #GCHQPuzzle? Here is the answer we were seeking

[GCHQ @GCHQ]

Puzzle people, assemble! It's #GCHQPuzzle time. 🧩

No cheating- answer first and then check the comments ⬇️

[GCHQ @GCHQ]

We are actively looking for the right mix of minds to join our organisation.

Are you a tech-tinkerer? An outside-the-box thinker?

You could be exactly what we need to help keep the UK safe.

⬇️ https://t.co/dlLPxIUflW

[GCHQ @GCHQ]

A message from Director GCHQ, Anne Keast-Butler following the sad passing of Sir Alex Younger.

[Bletchley Park @bletchleypark]

Join us at #NIHC2026 for three days of talks, panels and discussion at Bletchley Park.

Your ticket includes conference access, refreshments, lunch and admission to the historic site.

📅 14-16 Oct 2026
🎟️ https://t.co/CUyfOuryNF

#IntelligenceHistory #BletchleyPark @GCHQ

[Dan Jarvis MP @DanJarvisMBE]

MI5 and Five Eyes have exposed the tactics China use to secure sensitive information.

I urge all govt and military personnel to read the NPSA advice and be vigilant.

We will never tolerate activity which threatens our national security.

https://t.co/nQ31ifVAjL

[GCHQ @GCHQ]

GCHQ is saddened to learn of the death of Sir Alex Younger.

[GCHQ @GCHQ]

🚇 Mind the gap… between clues!

This week’s #GCHQPuzzle is now arriving on the platform. Take a moment, follow the lines and see if you can reach the right destination.

Where does your answer take you? 👇