Is there a simple way to check if a digital signature exists on a file without trying to verify the certificate it was signed with? I want to sign a long list of exe & dll files in a directory, but only files that haven t yet been signed. For example, if one of the files has been signed by Microsoft or some other 3rd party I don t want to sign them again with my company s certificate. It is easy to check if a file has a digital signature or not by right-clicking the file and viewing its properties (if the digital signature tab shows up then it has been signed). I m searching for a simple way to check for this digital signature property using C#. Right now, I am using the verify command with signtool.exe - which doesn t only check to see if a digital signature exists, but also whether the certificate used to sign the file was issued by a trusted authority. Here is my simple, yet clunky approach for doing this: private static Boolean AlreadySigned(string file) { ProcessStartInfo startInfo = new ProcessStartInfo(); startInfo.RedirectStandardOutput = true; startInfo.RedirectStandardError = true; startInfo.FileName = "signTool.exe"; startInfo.Arguments = "verify /v " + file; startInfo.UseShellExecute = false; Process process = new Process(); process.StartInfo = startInfo; process.EnableRaisingEvents = true; process.Start(); process.WaitForExit(); string output = process.StandardOutput.ReadToEnd(); return output.Contains("Signing Certificate Chain:"); } Notice that I m using the verbose flag "/v" and checking if the output contains the text "Signing Certificate chain:" - just because I noticed that that string was always in the output of a file that had been signed - and was omitted from any file that hadn t been signed. Anyway, despite its clumsiness, this code seems to get the job done. One reason I d like to change it though is because it appears to take a few hundred milliseconds to execute the verify command on a file. I don t need to verify the certificate I m just trying to see if a digital signature exists on the file. So in short, is there a simple way to check if a digital signature exists - without trying to verify it?