https://blog.wongcw.com/2020/10/13/%e7%be%8e%e7%ad%89%e6%95%b8%e5%9c%8b%e7%99%bc%e5%87%ba%e7%82%ba%e5%8a%a0%e5%af%86%e6%87%89%e7%94%a8%e8%a8%ad%e7%bd%ae%e5%be%8c%e9%96%80%e5%91%bc%e7%b1%b2/
美等數國發出為加密應用設置“後門”呼籲