According to Wikipedia, the Remote Desktop that's included with Windows Vista and later includes TLS encryption, which should be sufficient. Of course, you cou

According to Wikipedia, the Remote Desktop that's included with Windows Vista and later includes TLS encryption, which should be sufficient. Of course, you could just set up a Virtual Private Network (VPN), which encrypts your traffic and then tunnels it to some (presumably trustworthy) computer. One convenient open-source solution is OpenVPN, but there are lots of open-source and commercial options. This may or may not be blocked in China.