通过计算出相应文件或程序的哈希值，通过端到端的校验，为验证文件在传输过程当中是否准确无误提供了依据-By calculating the corresponding hash files or programs through end-to-check, in order to verify whether the file is accurate provided the basis for the transfer process

包含服务器端和发送端2个程序,在机器之间传输文件-Contains the server and sending two procedures, transfer files between machines