An analyst tells the BBC how she tracked down a victim of child sexual abuse after years of searching.

However, the government's position is now unclear, saying it "no longer has a preferred option" for what to do next.

It is hoped Charles H Bennett and Gilles Brassard's work will make digital communications secure for decades ahead.

The UK regulator said the ad condoned "digitally altering and exposing women's bodies without their consent."

Nvidia says the tool will transform game graphics - critics warn it could squeeze out artistic expression.

The artificial intelligence firm says it wants to prevent "catastrophic misuse" of its systems.