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Hi, did someone know how i could decrypt a BLOB-Data from the Windows Registry? For Example there is a digital certificate stored which looks like it is encrypted. Now i want to decrypt it with java and native call the crypt32.dll (function: cryptUnprotectData()) with JNA. i tried it, but i get data invalid error. the function could have many arguments, but i did not found out which i have to use exactly. here is my little peace of code - maybe it helps.. byte byteArray = (byte) Advapi32Util.registryGetValue(WinReg.HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft\\SystemCertificates\\AuthRoot\\Certificates\\02FAF3E291435468607857694DF5E45B68851868", "Blob"); byte protectedData = Crypt32Util.cryptProtectData(byteArray); String test = new String(protectedData); System.out.println(test); When i run this code i get: Data invalid - win32 exception. so i think something wrong with the input data. Maybe the data was not encrypted with dpapi? or i need to use some of the arguments (see here: http://msdn.microsoft.com/en-us/library/windows/desktop/aa380882%28v=vs.85%29.aspx)? Hope someone could help me :) thnx!