The British government has unveiled a tool that can accurately detect extremist content and block it from being viewed, the media reported on Tuesday.
Rudd visited the US to meet tech companies to discuss the idea, as well as other efforts to tackle extremism.
The tool was made as a way to demonstrate that the government's demand for a clampdown on extremist activity was not unreasonable, Rudd said.
"It's a very convincing example of the fact that you can have the information you need to make sure this material doesn't go online in the first place," she told the BBC.
Thousands of hours of content posted by the Islamic State (IS) terror group was run past the tool, in order to "train" it to automatically spot extremist material.
According to ASI Data Science, the software is capable of detecting 94 per cent of IS's online activity, with an accuracy of 99.995 per cent.
However, the bigger challenge is predicting which parts of the internet the terrorists will use next.