As others have already mentioned there is Intel SGX and the Signal developers indeed say they use it, see https://news.ycombinator.com/item?id=26729786 https:/

As others have already mentioned there is Intel SGX and the Signal developers indeed say they use it, see https://news.ycombinator.com/item?id=26729786 https://news.ycombinator.com/item?id=26729786