diff --git a/app/src/main/java/com/hippo/ehviewer/util/Crash.java b/app/src/main/java/com/hippo/ehviewer/util/Crash.java
index 934e8a1f4..9382d73c2 100644
--- a/app/src/main/java/com/hippo/ehviewer/util/Crash.java
+++ b/app/src/main/java/com/hippo/ehviewer/util/Crash.java
@@ -25,6 +25,8 @@ import android.content.pm.PackageManager.NameNotFoundException;
 import android.os.Build;
 import android.os.Environment;
 
+import com.hippo.ehviewer.ehclient.EhClient;
+
 import java.io.DataInputStream;
 import java.io.File;
 import java.io.FileInputStream;
@@ -129,7 +131,6 @@ public class Crash {
     }
 
     private static void collectDeviceInfo(StringBuffer sb) {
-        boolean getPackageInfo = false;
         try {
             PackageManager pm = mContext.getPackageManager();
             PackageInfo pi = pm.getPackageInfo(mContext.getPackageName(), PackageManager.GET_ACTIVITIES);
@@ -140,19 +141,23 @@ public class Crash {
                 sb.append("PackageName=").append(pi.packageName).append("\n");
                 sb.append("VersionName=").append(versionName).append("\n");
                 sb.append("VersionCode=").append(versionCode).append("\n");
+                sb.append("Signature=").append(PackageUtils.getSignature(mContext, pi.packageName)).append("\n");
                 sb.append("\n");
-
-                getPackageInfo = true;
             }
         } catch (NameNotFoundException e) {
             Log.e(TAG, "an error occured when collect package info", e);
-        }
-        if (!getPackageInfo) {
+
             sb.append("======== PackageInfo ========\n");
             sb.append("Can't get package information\n");
             sb.append("\n");
         }
 
+        // Runtime
+        sb.append("======== Runtime ========\n");
+        sb.append("Source=").append(EhClient.getUrlHeader()).append("\n");
+        sb.append("\n");
+
+        // Device info
         sb.append("======== DeviceInfo ========\n");
         sb.append("BOARD=").append(Build.BOARD).append("\n");
         sb.append("BOOTLOADER=").append(Build.BOOTLOADER).append("\n");
diff --git a/app/src/main/java/com/hippo/ehviewer/util/PackageUtils.java b/app/src/main/java/com/hippo/ehviewer/util/PackageUtils.java
new file mode 100644
index 000000000..c7c2417b1
--- /dev/null
+++ b/app/src/main/java/com/hippo/ehviewer/util/PackageUtils.java
@@ -0,0 +1,26 @@
+package com.hippo.ehviewer.util;
+
+import android.content.Context;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import android.content.pm.Signature;
+
+public final class PackageUtils {
+
+    private static final String TAG = PackageUtils.class.getSimpleName();
+
+    public static String getSignature(Context context, String packageName) {
+        try {
+            PackageInfo pi = context.getPackageManager().getPackageInfo(packageName, PackageManager.GET_SIGNATURES);
+            Signature[] ss = pi.signatures;
+            if (ss != null && ss.length >= 1) {
+                return Utils.computeSHA1(ss[1].toByteArray());
+            } else {
+                Log.e(TAG, "Can't find signature in package " + packageName);
+            }
+        } catch (PackageManager.NameNotFoundException e) {
+            Log.e(TAG, "Can't find package " + packageName, e);
+        }
+        return null;
+    }
+}
diff --git a/app/src/main/java/com/hippo/ehviewer/util/Utils.java b/app/src/main/java/com/hippo/ehviewer/util/Utils.java
index d7112652c..f266b1b7c 100644
--- a/app/src/main/java/com/hippo/ehviewer/util/Utils.java
+++ b/app/src/main/java/com/hippo/ehviewer/util/Utils.java
@@ -16,23 +16,6 @@
 
 package com.hippo.ehviewer.util;
 
-import java.io.ByteArrayOutputStream;
-import java.io.Closeable;
-import java.io.EOFException;
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
-import java.lang.reflect.Method;
-import java.text.DateFormat;
-import java.text.SimpleDateFormat;
-import java.util.Collection;
-import java.util.Date;
-import java.util.List;
-import java.util.Locale;
-
 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.content.SharedPreferences;
@@ -45,6 +28,25 @@ import android.webkit.MimeTypeMap;
 
 import com.hippo.ehviewer.AppHandler;
 
+import java.io.ByteArrayOutputStream;
+import java.io.Closeable;
+import java.io.EOFException;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.lang.reflect.Method;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import java.util.Collection;
+import java.util.Date;
+import java.util.List;
+import java.util.Locale;
+
 public final class Utils {
     @SuppressWarnings("unused")
     private static String TAG = Utils.class.getSimpleName();
@@ -760,4 +762,34 @@ public final class Utils {
             container[1] = filename.substring(index + 1);
         }
     }
+
+    /**
+     * @return looks like A1:43:6B:34... or null
+     */
+    public static String computeSHA1(final byte[] certRaw) {
+        StringBuilder sb = new StringBuilder(59);
+        MessageDigest md;
+        try {
+            md = MessageDigest.getInstance("SHA1");
+            byte[] sha1 = md.digest(certRaw);
+            int length = sha1.length;
+            for (int i = 0; i  < length; i++) {
+                if (i != 0) {
+                    sb.append(':');
+                }
+                byte b = sha1[i];
+                String appendStr = Integer.toString(b & 0xff, 16);
+                if (appendStr.length() == 1) {
+                    sb.append(0);
+                }
+                sb.append(appendStr);
+            }
+
+            return sb.toString().toUpperCase();
+        }
+        catch (NoSuchAlgorithmException ex) {
+            Log.e(TAG, "Can't final Algorithm SHA1", ex);
+            return null;
+        }
+    }
 }