请设计和实现一个算法，把一个文件M由A传输到B并保证 （1）文件M的完整性 （2）文件M的机密性 （3）B能够确认M的发送方-Please design and implementation of an algorithm to a file transfer M from A to B and warrant that (a) file the integrity of the M (2) file M, confidentiality (3) B able to identify

请设计和实现一个算法，把一个文件M由A传输到B并保证 （1）文件M的完整性 （2）文件M的机密性 （3）B能够确认M的发送方-Please design and implementation of an algorithm to a file transfer M from A to B and warrant that (a) file the integrity of the M (2) file M, confidentiality (3) B able to identify the s