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Index/Topics/Client-Side Scanning (CSS) Designs

Client-Side Scanning (CSS) Designs

Client-side scanning designs that inspect content on users' devices before encryption for detecting child sexual abuse material (CSAM).

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Jan 15, 2026
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What technical designs for client‑side scanning have been proposed in UK government/Ofcom documents and what are their documented privacy risks?

The UK’s Online Safety legislation and related Ofcom powers contemplate client‑side scanning (CSS) designs that inspect content on users’ devices before encryption, using mechanisms such as on‑device ...

Jan 20, 2026

What technical audits and governance mechanisms would be needed to prevent repurposing or abuse of client‑side scanning systems?

Client‑side scanning systems pose unusual risks because they shift detection onto end devices; preventing their repurposing or abuse therefore requires a blended program of rigorous technical audits, ...