I need a program that scans for unencrypted files.
The files are encrypted with PGP, GPG, and WinZipAES256, so the program needs to be able to recognize these formats as encrypted.
Since I need to scan the actual file content rather than checking the file extension only, I researched ways to detect file entropy.
I can use a program like http://www.fourmilab.ch/random/ with good results; however, it might be a problem if a picture of sensitive data is uploaded, since the program returns a high value for pictures.
Does anyone know a better way to accomplish this task? Any help would be appreciated.