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New cross domain guidance for government, industry and the wider security community ↗ source

April 21, 2026 NCSC Guidance

Summary

Cross domain technologies play a vital role in helping organisations to move data safely between environments with different security levels. The NCSC know this area can be challenging to navigate, which is why we’ve produced new guidance on Cross domain approach and architecture. The guidance makes the adoption of cross domain technologies more straightforward and more secure. This blog outlines what has changed, the reasons behind those changes, and what updates you can expect in the months A brief history of cross domain The NCSC and partners have developed cross domain solutions for many years, particularly in the defence and intelligence sectors. Organisations operating within these sectors have long required secure movement of data between systems operating at different security levels, and cross domain solutions have been central to meeting that need.

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