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seen Jun 25 '13 at 8:51

Jul
23
awarded  Teacher
Aug
21
comment Check if a file has been changed
If not then you have to use operating system level access control to allow only software to modify and read those files.
Aug
21
comment Check if a file has been changed
So do not sign files only sign data in files, ie. use xml and sign every xml part that contains some atomic data. That way your A will only have to hash and sign appended data.
Aug
21
answered Check if a file has been changed