By creating different types of programs, sometimes there is a problem to ensure the authenticity of the file. This situation occurs, when these files are very important data, change which could lead to generate different types of losses. Such files can be license files, containing financial data, and medical data, etc. This problem can be solved very easily using XML files. Just, sign that the XML file and check the signature before re-use file. If it is correct then we will have confidence, that the file has not been any unauthorized modifications. In the event of any change, signature of [...]