diff --git a/build.xml b/build.xml
index 5769f23c..fc077552 100644
--- a/build.xml
+++ b/build.xml
@@ -14,6 +14,7 @@
 			<fileset dir="${dir.development}\source\Equivalent-Exchange-3\ee3_common\" />
 		</copy>
 		<replace dir="${dir.development}\mcp\src\minecraft" token="@VERSION@" value="${release.mod.version}" />
+		<replace dir="${dir.development}\mcp\src\minecraft" token="@FINGERPRINT@" value="${release.mod.fingerprint}" />
 	</target>
 	
 	<target name="recompile">
@@ -33,16 +34,16 @@
 	
 	<target name="reobfuscate">
 		<exec dir="${dir.development}\mcp" executable="cmd" os="Windows 7">
-			<arg line="/c reobfuscate.bat" />
+			<arg line="/c reobfuscate_srg.bat" />
 		</exec>
 		<exec dir="${dir.development}\mcp" executable="cmd" os="Windows 8">
-			<arg line="/c reobfuscate.bat" />
+			<arg line="/c reobfuscate_srg.bat" />
 		</exec>
 		<exec dir="${dir.development}\mcp" executable="bash" os="Linux">
-			<arg line="reobfuscate.sh" />
+			<arg line="reobfuscate_srg.sh" />
 		</exec>
 		<exec dir="${dir.development}\mcp" executable="bash" os="Mac OS X">
-			<arg line="reobfuscate.sh" />
+			<arg line="reobfuscate_srg.sh" />
 		</exec>
 	</target>
 	
@@ -80,8 +81,10 @@
 			<fileset dir="${dir.development}\source\Equivalent-Exchange-3\resources" />
 		</jar>
 		
+		<!-- Sign the jar -->
+		<signjar jar="${dir.release}\${release.minecraft.version}\${release.mod.version}\ee3-universal-${release.mod.version}.jar" keystore="${keystore.location}" alias="${keystore.alias}" storepass="${keystore.password}" />
+		
 		<!-- Clean up the MCP source now that we are done -->
 		<antcall target="clean" />
 	</target>
-	
 </project>
\ No newline at end of file
diff --git a/ee3_common/com/pahimar/ee3/EquivalentExchange3.java b/ee3_common/com/pahimar/ee3/EquivalentExchange3.java
index 7f1db3dd..7d51fc40 100644
--- a/ee3_common/com/pahimar/ee3/EquivalentExchange3.java
+++ b/ee3_common/com/pahimar/ee3/EquivalentExchange3.java
@@ -1,6 +1,7 @@
 package com.pahimar.ee3;
 
 import java.io.File;
+import java.util.logging.Level;
 
 import net.minecraft.creativetab.CreativeTabs;
 import net.minecraft.item.crafting.CraftingManager;
@@ -26,16 +27,19 @@ import com.pahimar.ee3.creativetab.CreativeTabEE3;
 import com.pahimar.ee3.item.ModItems;
 import com.pahimar.ee3.item.crafting.RecipesAlchemicalBagDyes;
 import com.pahimar.ee3.lib.Reference;
+import com.pahimar.ee3.lib.Strings;
 import com.pahimar.ee3.network.PacketHandler;
 import com.pahimar.ee3.recipe.RecipesTransmutationStone;
 
 import cpw.mods.fml.common.Mod;
+import cpw.mods.fml.common.Mod.FingerprintWarning;
 import cpw.mods.fml.common.Mod.Init;
 import cpw.mods.fml.common.Mod.Instance;
 import cpw.mods.fml.common.Mod.PostInit;
 import cpw.mods.fml.common.Mod.PreInit;
 import cpw.mods.fml.common.Mod.ServerStarting;
 import cpw.mods.fml.common.SidedProxy;
+import cpw.mods.fml.common.event.FMLFingerprintViolationEvent;
 import cpw.mods.fml.common.event.FMLInitializationEvent;
 import cpw.mods.fml.common.event.FMLPostInitializationEvent;
 import cpw.mods.fml.common.event.FMLPreInitializationEvent;
@@ -43,6 +47,7 @@ import cpw.mods.fml.common.event.FMLServerStartingEvent;
 import cpw.mods.fml.common.network.NetworkMod;
 import cpw.mods.fml.common.network.NetworkRegistry;
 import cpw.mods.fml.common.registry.GameRegistry;
+import cpw.mods.fml.common.registry.LanguageRegistry;
 import cpw.mods.fml.common.registry.TickRegistry;
 import cpw.mods.fml.relauncher.Side;
 
@@ -55,7 +60,7 @@ import cpw.mods.fml.relauncher.Side;
  * @license Lesser GNU Public License v3 (http://www.gnu.org/licenses/lgpl.html)
  * 
  */
-@Mod(modid = Reference.MOD_ID, name = Reference.MOD_NAME, version = Reference.VERSION)
+@Mod(modid = Reference.MOD_ID, name = Reference.MOD_NAME, version = Reference.VERSION, certificateFingerprint = Reference.FINGERPRINT)
 @NetworkMod(channels = { Reference.CHANNEL_NAME }, clientSideRequired = true, serverSideRequired = false, packetHandler = PacketHandler.class)
 public class EquivalentExchange3 {
 
@@ -67,6 +72,13 @@ public class EquivalentExchange3 {
 
     public static CreativeTabs tabsEE3 = new CreativeTabEE3(CreativeTabs.getNextID(), Reference.MOD_ID);
 
+    @FingerprintWarning
+    public void invalidFingerprint(FMLFingerprintViolationEvent event) {
+        
+        // Report (log) to the user that the version of Equivalent Exchange 3 they are using has been changed/tampered with
+        LogHelper.log(Level.SEVERE, LanguageRegistry.instance().getStringLocalization(Strings.INVALID_FINGERPRINT_MESSAGE));
+    }
+    
     @ServerStarting
     public void serverStarting(FMLServerStartingEvent event) {
 
@@ -155,6 +167,5 @@ public class EquivalentExchange3 {
 
         // Initialize the Addon Handler
         AddonHandler.init();
-
     }
 }
diff --git a/ee3_common/com/pahimar/ee3/lib/Reference.java b/ee3_common/com/pahimar/ee3/lib/Reference.java
index 2eab9bc3..f1255280 100644
--- a/ee3_common/com/pahimar/ee3/lib/Reference.java
+++ b/ee3_common/com/pahimar/ee3/lib/Reference.java
@@ -19,6 +19,7 @@ public class Reference {
     public static final String MOD_NAME = "Equivalent Exchange 3";
     public static final String VERSION = "@VERSION@";
     public static final String CHANNEL_NAME = MOD_ID;
+    public static final String FINGERPRINT = "@FINGERPRINT@";
     public static final int SECOND_IN_TICKS = 20;
     public static final int SHIFTED_ID_RANGE_CORRECTION = 256;
     public static final String SERVER_PROXY_CLASS = "com.pahimar.ee3.core.proxy.CommonProxy";
diff --git a/ee3_common/com/pahimar/ee3/lib/Strings.java b/ee3_common/com/pahimar/ee3/lib/Strings.java
index 938e2350..4ec39f88 100644
--- a/ee3_common/com/pahimar/ee3/lib/Strings.java
+++ b/ee3_common/com/pahimar/ee3/lib/Strings.java
@@ -15,6 +15,9 @@ public class Strings {
     public static final String TRUE = "true";
     public static final String FALSE = "false";
 
+    /* Fingerprint check related constants */
+    public static final String INVALID_FINGERPRINT_MESSAGE = "fingerprint_check.invalid";
+    
     /* Version check related constants */
     public static final String VERSION_CHECK_INIT_LOG_MESSAGE = "version.init_log_message";
     public static final String UNINITIALIZED_MESSAGE = "version.uninitialized";
diff --git a/resources/mods/ee3/lang/en_US.xml b/resources/mods/ee3/lang/en_US.xml
index cbc9244f..e3ef5046 100644
--- a/resources/mods/ee3/lang/en_US.xml
+++ b/resources/mods/ee3/lang/en_US.xml
@@ -27,6 +27,7 @@
 	<entry key="container.alchemicalChest">Alchemical Chest</entry>
 	<entry key="container.alchemicalBag">Alchemical Bag</entry>
 	<entry key="itemGroup.EE3">Equivalent Exchange 3</entry>
+	<entry key="fingerprint_check.invalid">The copy of Equivalent Exchange 3 that you are running has been modified from the original, and unpredictable things may happen. Please consider re-downloading the original version of the mod.</entry>
 	<entry key="version.init_log_message">Initializing remote version check against remote version authority, located at</entry>
 	<entry key="version.uninitialized">Remote version check failed to initialize properly</entry>
 	<entry key="version.current">Currently using the most up to date version (@REMOTE_MOD_VERSION@) of Equivalent Exchange 3 for @MINECRAFT_VERSION@</entry>