HTTP(HyperText Transfer Protocol)是一套计算机通过网络进行通信的规则。计算机专家设计出HTTP,使HTTP客户(如Web浏览器)能够从HTTP服务器(Web服务器)请求信息和服务,HTTP目前协议的版本是1.1.HTTP是一种无状态的协议,无状态是指Web浏览器和Web服务器之间不需要建立持久的连接,这意味着当一个客户端向服务器端发出...【阅读全文】
For a n-bit RSA key, direct encryption (with PKCS#1 "old-style" padding) works for arbitrary binary messages up to floor(n/8)-11 bytes. In other words, for a 1024-bit RSA key (128 bytes), up to 117 bytes. With OAEP (the PKCS#1 "new-style" padding), this is a bit less: OAEP...【阅读全文】
文章来源:http://my.oschina.net/Kenyon/blog/97227先谈一下postgresql中涉及用户密码的几张表: select username,passwd from pg_shadow;select rolname,rolpassword from pg_authid;select usename,passwd from pg_user;select rolname,rolpassword from pg_roles前面两张表存有加密后的密码字符串,后面两张表存...【阅读全文】