http://ssd.iykpqm7jiradoeezzkhj7c4b33g4hbgfwelht2evxxeicbpjy44c7ead.onion/zh-hans/module/communiquer-avec-autrui
The English version may be more up-to-date. Telecommunication networks and the internet have made communicating with people easier than ever, but have also made surveillance more prevalent. Without taking extra steps to protect your privacy, every phone call, text message, email, instant message, video and audio chat, and social media message could be vulnerable to eavesdroppers.