Chris Froome has reiterated his promise that he will never be stripped of his results in a doping scandal after taking control of the 100th Tour de France on Saturday.

Froome attacked late on stage eight to Ax 3 Domaines to become the sixth Briton to wear the yellow jersey, taking significant time out of his general classification rivals in the process.

As was the case with Bradley Wiggins last year, there was an inevitability about the way Froome was asked about the subject of doping after his display.

But where Wiggins occasionally lost his cool when the topic was raised during his time in yellow, Froome answered coolly.

When it was suggested that Team Sky's dominant display on the first mountain stage was reminiscent of Lance Armstrong's US Postal team, Froome promised Sky were clean.

"100 per cent," he said. "I think it's normal that people ask questions in cycling, given the history of the sport, that's the unfortunate position we find ourselves in at the moment.

"Eyebrows are going to be raised and questions are going to be asked about our performances. But I know the sport has changed."

With revelations about the sport's darkest days in the late 1990s and early 2000s continuing to be made all the time, Froome said it was unfortunate for current-day riders that they are tarred with the same brush.

"If you look at it logically you know that the sport is in a better position now than it has been for the last 20-30 years," he said.

"I think the results now are definitely a lot more credible. The questions should be asked of people who were winning races five-ten years ago when we know doping was more prevalent.

"For me it is a bit of a personal mission to show that the sport has changed. I certainly know the results I am getting won't be stripped 20-30 years down the line. Rest assured that is not going to happen."