Push Away Your Privacy: Precise User Tracking Based on TLS Client Certificate Authentication

http://tma.ifip.org/wordpress/wp-content/uploads/2017/06/tma2017_paper2.pdf

苹果推送服务在TLS1.2版本的握手时，由于采用明文客户端证书，可能容易被中间节点passive monitor分析，影响用户隐私。

TLS1.3修复了这个，重点参看Related Work。