File Integrity Checking System Based on Message Digest Function

We design and implement the file integrity checking system based on message digest function, using C# language in Microsoft Visual Studio 2005 integrated development environment.The system provides file integrity detection function by calculating the message digest value of CRC32、MD5 and SHA1, so as to provide the evidence of invasion discovery for the system administrator.The experimental evaluations show that the system generates the correct message digest value of CRC32、MD5 and SHA1 in the testing process of multiple files integrity.