diff --git a/NDecrypt.Core/DSTool.cs b/NDecrypt.Core/DSTool.cs
index bfefcf3..cd121ff 100644
--- a/NDecrypt.Core/DSTool.cs
+++ b/NDecrypt.Core/DSTool.cs
@@ -132,12 +132,17 @@ namespace NDecrypt.Core
                 // Open the file for reading
                 using var input = File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
 
+                // Deserialize the cart information
+                var cart = Nitro.Create(input);
+                if (cart?.Model == null)
+                    return "Error: Not a DS/DSi cart image!";
+
                 // Get a string builder for the status
                 var sb = new StringBuilder();
                 sb.Append("\tSecure Area: ");
 
                 // Get the encryption status
-                bool? decrypted = CheckIfDecrypted(input);
+                bool? decrypted = cart.CheckIfDecrypted(out _);
                 if (decrypted == null)
                     sb.Append("Empty");
                 else if (decrypted == true)
@@ -156,97 +161,6 @@ namespace NDecrypt.Core
             }
         }
 
-        /// <summary>
-        /// Determine if the current file is already decrypted or not (or has an empty secure area)
-        /// </summary>
-        /// <param name="reader">Stream representing the input</param>
-        /// <returns>True if the file has known values for a decrypted file, null if it's empty, false otherwise</returns>
-        private static bool? CheckIfDecrypted(Stream reader)
-        {
-            reader.Seek(0x4000, SeekOrigin.Begin);
-            uint firstValue = reader.ReadUInt32();
-            uint secondValue = reader.ReadUInt32();
-
-            // Empty secure area standard
-            if (firstValue == 0x00000000 && secondValue == 0x00000000)
-            {
-                Console.WriteLine("Empty secure area found. Cannot be encrypted or decrypted.");
-                return null;
-            }
-
-            // Improperly decrypted empty secure area (decrypt empty with woodsec)
-            else if ((firstValue == 0xE386C397 && secondValue == 0x82775B7E)
-                || (firstValue == 0xF98415B8 && secondValue == 0x698068FC)
-                || (firstValue == 0xA71329EE && secondValue == 0x2A1D4C38)
-                || (firstValue == 0xC44DCC48 && secondValue == 0x38B6F8CB)
-                || (firstValue == 0x3A9323B5 && secondValue == 0xC0387241))
-            {
-                Console.WriteLine("Improperly decrypted empty secure area found. Should be encrypted to get proper value.");
-                return true;
-            }
-
-            // Improperly encrypted empty secure area (encrypt empty with woodsec)
-            else if ((firstValue == 0x4BCE88BE && secondValue == 0xD3662DD1)
-                || (firstValue == 0x2543C534 && secondValue == 0xCC4BE38E))
-            {
-                Console.WriteLine("Improperly encrypted empty secure area found. Should be decrypted to get proper value.");
-                return false;
-            }
-
-            // Properly decrypted nonstandard value (mastering issue)
-            else if ((firstValue == 0xD0D48B67 && secondValue == 0x39392F23) // Dragon Quest 5 (EU)
-                || (firstValue == 0x014A191A && secondValue == 0xA5C470B9)   // Dragon Quest 5 (USA)
-                || (firstValue == 0x7829BC8D && secondValue == 0x9968EF44)   // Dragon Quest 5 (JP)
-                || (firstValue == 0xC4A15AB8 && secondValue == 0xD2E667C8)   // Prince of Persia (EU)
-                || (firstValue == 0xD5E97D20 && secondValue == 0x21B2A159))  // Prince of Persia (USA)
-            {
-                Console.WriteLine("Decrypted secure area for known, nonstandard value found.");
-                return true;
-            }
-
-            // Properly decrypted prototype value
-            else if (firstValue == 0xBA35F813 && secondValue == 0xB691AAE8)
-            {
-                Console.WriteLine("Decrypted secure area for prototype found.");
-                return true;
-            }
-
-            // Strange, unlicenced values that can't determine decryption state
-            else if ((firstValue == 0xE1D830D8 && secondValue == 0xE3530000) // Aquela Ball (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0xDC002A02 && secondValue == 0x2900E612)   // Bahlz (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0xE1A03BA3 && secondValue == 0xE2011CFF)   // Battle Ship (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0xE3A01001 && secondValue == 0xE1A02001)   // Breakout!! DS (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0xE793200C && secondValue == 0xE4812004)   // Bubble Fusion (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0xE583C0DC && secondValue == 0x0A00000B)   // Carre Rouge (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0x0202453C && secondValue == 0x02060164)   // ChainReaction (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0xEBFFF218 && secondValue == 0xE31000FF)   // Collection (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0x4A6CD003 && secondValue == 0x425B2301)   // DiggerDS (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0xE3A00001 && secondValue == 0xEBFFFF8C)   // Double Skill (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0x21043701 && secondValue == 0x45BA448C)   // DSChess (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0xE59D0010 && secondValue == 0xE0833000)   // Hexa-Virus (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0xE5C3A006 && secondValue == 0xE5C39007)   // Invasion (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0xE1D920F4 && secondValue == 0xE06A3000)   // JoggleDS (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0xE59F32EC && secondValue == 0xE5DD7011)   // London Underground (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0xE08A3503 && secondValue == 0xE1D3C4B8)   // NumberMinds (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0xE1A0C001 && secondValue == 0xE0031001)   // Paddle Battle (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0xE1A03005 && secondValue == 0xE88D0180)   // Pop the Balls (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0xE8BD4030 && secondValue == 0xE12FFF1E)   // Solitaire DS (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0xE0A88006 && secondValue == 0xE1A00003)   // Squash DS (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0xE51F3478 && secondValue == 0xEB004A02)   // Super Snake DS (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0x1C200052 && secondValue == 0xFD12F013)   // Tales of Dagur (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0x601F491E && secondValue == 0x041B880B)   // Tetris & Touch (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0xE1A03843 && secondValue == 0xE0000293)   // Tic Tac Toe (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0xE3530000 && secondValue == 0x13A03003)   // Warrior Training (World) (Unl) (Datel Games n' Music)
-                || (firstValue == 0x02054A80 && secondValue == 0x02054B80))  // Zi (World) (Unl) (Datel Games n' Music)
-            {
-                Console.WriteLine("Unlicensed invalid value found. Unknown if encrypted or decrypted.");
-                return null;
-            }
-
-            // Standard decryption values
-            return firstValue == 0xE7FFDEFF && secondValue == 0xE7FFDEFF;
-        }
-
         #endregion
     }
 }