http://www.uml.org.cn/bigdata/201803073.asp
http://blog.sciencenet.cn/blog-430956-582743.html
http://www.ruanyifeng.com/blog/2013/06/rsa_algorithm_part_one.html
http://www.ruanyifeng.com/blog/2013/07/rsa_algorithm_part_two.html
http://www.ruanyifeng.com/blog/2011/08/what_is_a_digital_signature.html
http://www.cnblogs.com/songwenlong/p/6517165.html
https://segmentfault.com/a/1190000009459540
https://www.jianshu.com/p/a6bc56193b57
https://www.jianshu.com/p/39be41dfb5fa
https://blog.csdn.net/little_prog/article/details/79263342
https://www.tangshuang.net/4117.html
https://ethfans.org/posts/from-BIP-to-ethereum-HD-wallet