diff --git a/USB Lockdown/authentication.cs b/USB Lockdown/authentication.cs
index 6747431..e527f09 100644
--- a/USB Lockdown/authentication.cs	
+++ b/USB Lockdown/authentication.cs	
@@ -18,10 +18,11 @@ namespace USB_Lockdown
 
         internal static void beginAuthentication()
         {
+            deviceScan.calculateHash();
             Thread deviceScanner = new Thread(deviceScan.scanDevices);
             deviceScanner.Join(); //the thread will exit when a valid drive has been found
 
-            //code here to unlock computer and 
+            //code here to unlock computer and stuff
         }
     }
     class deviceScan
@@ -29,14 +30,21 @@ namespace USB_Lockdown
         internal static DriveInfo validDrive;
         internal static DriveInfo[] driveListing;
         private static bool driveFound = false;
+        internal static string originalHash;
 
+        internal static void calculateHash()
+        {
+            //decide how to do this!
 
+        }
         internal static void scanDevices()
         {
             while (!driveFound) {
                 driveListing = DriveInfo.GetDrives();
                 foreach (DriveInfo currentDrive in driveListing)
                 {
+                    try { string driveName = currentDrive.VolumeLabel; string driveLabel = currentDrive.Name; }
+                    catch { }
                     if (File.Exists(currentDrive.Name + "\\LockDown.config")) // the first check for a valid drive. Could be something else, but this is a lightweight test to be done first!
                     {
                         if (driveValidate(currentDrive)) //runs the full validation of the drive
@@ -51,10 +59,26 @@ namespace USB_Lockdown
         }
 
         internal static bool driveValidate(DriveInfo drive){
-
+            if (!checkHash(drive)) {
+                return false;
+            }
             return true;
         }
 
+        private static bool checkHash(DriveInfo drive)
+        {
+            string fileName = drive.Name + "";
+            if (!File.Exists(fileName)) { return false; }
+
+            using (BinaryReader reader = new BinaryReader(File.Open(fileName, FileMode.Open)))
+            {
+                string hashFromDrive = reader.ReadString();
+                if (hashFromDrive != )
+            }
+            return true;
+        }
+
+
         internal static void resetValues()
         {
             validDrive = null;