diff --git a/src/main/java/cc/baka9/catseedlogin/util/CommunicationAuth.java b/src/main/java/cc/baka9/catseedlogin/util/CommunicationAuth.java
index b65338a..9ce37cc 100644
--- a/src/main/java/cc/baka9/catseedlogin/util/CommunicationAuth.java
+++ b/src/main/java/cc/baka9/catseedlogin/util/CommunicationAuth.java
@@ -5,22 +5,27 @@
 
 public class CommunicationAuth {
 
-    public static String encryption(String... args) {
-        String paramString = String.join("", args);
+    private static MessageDigest messageDigest;
+
+    static {
         try {
-            MessageDigest messageDigest = MessageDigest.getInstance("MD5");
-            messageDigest.update(paramString.getBytes());
-            byte[] arrayOfByte = messageDigest.digest();
-            StringBuilder stringBuilder = new StringBuilder();
-            for (byte value : arrayOfByte) {
-                int unsignedByte = value & 0xff;
-                if (unsignedByte < 16) stringBuilder.append("0");
-                stringBuilder.append(Integer.toHexString(unsignedByte));
-            }
-            return stringBuilder.toString().toLowerCase();
+            messageDigest = MessageDigest.getInstance("SHA-256");
         } catch (NoSuchAlgorithmException e) {
-            return null;
+            // 适当地处理异常
+            e.printStackTrace();
+        }
+    }
+
+    public static String encryption(String... args) {
+        String paramString = String.join("", args);
+        byte[] arrayOfByte = messageDigest.digest(paramString.getBytes());
+        StringBuilder stringBuilder = new StringBuilder();
+        for (byte value : arrayOfByte) {
+            int unsignedByte = value & 0xff;
+            if (unsignedByte < 16) stringBuilder.append("0");
+            stringBuilder.append(Integer.toHexString(unsignedByte));
         }
+        return stringBuilder.toString().toLowerCase();
     }
 
-}
+}
\ No newline at end of file