MD5的全称是Message-digest Algorithm 5（信息-摘要算法），用于确保信息传输完整一致。在90年代初由MIT Laboratory for Computer Science和RSA Data Security Inc,的Ronald L. Rivest开发出来，经MD2、MD3和MD4发展而来。它的作用是让大容量信息在用数字签名软件签署私人密钥前被"压缩"成一种保密的格式（就是把一个任意长度的字节串变换成一定长的大整数）。不管是MD2、MD4还是MD5，它们都需要获得一
Network Working Group Steve Crocker Request for Comments: 1 UCLA 7 April 1969 Title: Host Software Author: Steve Crocker Installation: UCLA Date: 7 April 1969 Network Working Group Request for Comment: 1 CONTENTS INTRODUCTION I. A Summary of the IMP
超级经典！！！ The Art of Unix Programming Eric Steven Raymond Table of Contents 目录 Requests for reviewers and copy-editors Preface Who Should Read This Book How To Use This Book Related References Conventions Used In This Book Our Case Studies Author's Ac
The Internet Protocol (IP) Multimedia Subsystem, better known as "The IMS", is based on the specification of the Session Initiation Protocol (SIP) as standardized by the Internet Engineering Task Force (IETF). But SIP as a Protocol is only one part
