https://blog.csdn.net/u012874222/article/details/50339259
http://www.blogjava.net/icewee/archive/2012/06/04/379947.html
http://www.bouncycastle.org/latest_releases.html
https://blog.csdn.net/zxlworking1/article/details/79716937
非对称加密
https://www.cnblogs.com/shoshana-kong/p/10934686.html
自签名证书
https://blog.csdn.net/u013765342/article/details/36628007