java编译混淆

1. java娣锋穯缂栬疟鍣

銆銆銆銆链杩戣瘯鐢ㄤ简鍑犱釜Java娣锋穯鍣(Java Obfuscator) 镒熻夋病链変竴涓瀹屽叏鍙︿汉婊℃剰镄 浜庢槸𨱍冲共鑴呜嚜宸卞啓涓涓寰椾简 缈讳简鍑犻〉Java铏氭嫙链鸿勮寖涔嫔悗绐佸彂濂囨兂 鍒镄勬贩娣嗗櫒閮芥槸鍦ㄧ紪璇戝ソ镄刡yte code涓婂仛鏂囩珷 鑳戒笉鑳戒粠婧愮爜鐩存帴缂栬疟鎴愮粡杩囨贩娣嗙殑class鏂囦欢锻锛熷氨杩欐牱鑺变简涓涓澶氭槦链熺殑镞堕棿鍐欎简涓涓狫ava娣锋穯缂栬疟鍣(Java Obfuscator Compiler) 銆銆銆銆 Q: 浠涔堟槸娣锋穯鍣锛 銆銆銆銆A: 鐢变簬Java绋嫔簭杩愯屾椂鏄锷ㄦ佽繛鎺ョ殑 锲犳ょ紪璇戞垚镄勭洰镙囨枃浠朵腑鍖呭惈链夌﹀彿琛 浣垮缑Java绋嫔簭寰埚规槗琚鍙岖紪璇 娣锋穯鍣ㄥ彲浠ユ墦涔眂lass鏂囦欢涓镄勭﹀彿淇℃伅 浣垮弽钖戝伐绋嫔彉寰楅潪甯稿汹闅 銆銆銆銆 Q: 鐜版湁镄勬贩娣嗗櫒链変粈涔堥梾棰桡纻 銆銆銆銆A: 鐜版湁镄勬贩娣嗗櫒閮芥槸瀵圭紪璇戝ソ镄刢lass鏂囦欢杩涜屾贩娣 杩欐牱灏遍渶瑕佺紪璇戝拰娣锋穯涓や釜姝ラ 骞朵笉鏄镓链夌殑绗﹀彿閮介渶瑕佹贩娣 濡傛灉浣犲紑鍙戠殑鏄涓涓绫诲簱 鎴栬呮煇浜涚被闇瑕佸姩镐佽呰浇 闾ｄ簺鍏鍏盇PI灏卞繀椤讳缭鐣欑﹀彿涓嶅彉 杩欐牱鍒浜烘墠鑳戒娇鐢ㄤ綘镄勭被搴 鐜版湁镄勬贩娣嗗櫒鎻愪緵浜咷UI鎴栬剼链镄勬柟寮忔潵瀵归偅浜涢渶瑕佷缭鐣欑殑绗﹀彿钖岖О杩涜岄厤缃 濡傛灉绋嫔簭杈冨ぇ镞堕厤缃宸ヤ綔鍙桦缑寰埚嶆潅 钥岀▼搴忎竴镞︿慨鏀归厤缃宸ヤ綔鍙堣侀吨鏂拌繘琛 镆愪簺娣锋穯鍣ㄨ兘澶熻皟鏁村瓧鑺傜爜镄勯‘搴 浣垮弽缂栬疟镟村姞锲伴毦 浣嗘垜缁忓巻杩囨贩娣嗕箣钖庣殑绋嫔簭杩愯屽嚭阌欑殑𨱍呭喌 銆銆銆銆 Q: Java娣锋穯缂栬疟鍣ㄦ槸濡备綍宸ヤ綔镄勶纻 銆銆銆銆A: Java娣锋穯缂栬疟鍣ㄦ槸鍦⊿un JDK涓鎻愪緵镄凧ava缂栬疟鍣(javac)镄勫熀纭涓婂畬鎴愮殑 淇鏀逛简浠ｇ爜鐢熸垚杩囩▼ 瀵圭紪璇戝櫒鐢熸垚镄勪腑闂翠唬镰佽繘琛屾贩娣 链钖庡啀鐢熸垚class鏂囦欢 杩欐牱缂栬疟鍜屾贩娣嗗彧闇瑕佷竴涓姝ラゅ氨鍙浠ュ畬鎴 鍙﹀栧彲浠ュ湪婧愮▼搴忎腑鎻掑叆绗﹀彿淇濈暀鎸囦护𨱒ユ带鍒跺摢浜涚﹀彿闇瑕佷缭鐣 涓嶉渶瑕佸崟镫镄勯厤缃 銆銆銆銆 Q: 濡备綍瀹夎呭拰杩愯孞OC锛 銆銆銆銆A: 涓嬭浇joc jar () 杩愯宩ava jar joc jar灏卞彲浠ュ惎锷↗ava娣锋穯缂栬疟鍣 joc镄勫懡浠よ屽弬鏁板拰javac瀹屽叏鐩稿悓 浣嗗炲姞浜嗕竴涓鏂扮殑鍙傛暟 Xobfuscate 瀹幂殑鐢ㄦ硶濡备笅 銆銆銆銆 Xobfuscate:<level>銆銆鍏朵腑<level>鎸囧畾娣锋穯绾у埆 鍙浠ユ槸浠ヤ笅鍑犵岖骇鍒 銆銆銆銆 Xobfuscate:none銆銆銆銆涓嶈繘琛屾贩娣嗐銆銆銆 Xobfuscate:private銆銆 瀵规墍链塸rivate璁块梾绾у埆镄勫厓绱犺繘琛屾贩娣嗐銆銆銆 Xobfuscate:package銆銆 瀵规墍链塸rivate鎴杙ackage private鍏幂礌杩涜屾贩娣嗐銆銆銆 Xobfuscate:protected銆 瀵规墍链塸rivate package private protected鍏幂礌杩涜屾贩娣嗐銆銆銆 Xobfuscate:public銆銆銆瀵规墍链夌殑鍏幂礌閮借繘琛屾贩娣嗐銆銆銆 Xobfuscate:all銆銆銆銆 鐩稿綋浜 Xobfuscate:public銆銆濡傛灉浣跨敤 Xobfuscate涓嶅甫绾у埆鍙傛暟 鍒欑浉褰扑簬 Xobfuscate:package銆銆銆銆 Q: 濡备綍浣跨敤绗﹀彿淇濈暀鎸囦护锛 銆銆銆銆A: 闄や简鍦ㄥ懡浠よ岀敤 Xobfuscate鍙傛暟鎺у埗绗﹀彿娣锋穯绾у埆澶 杩桦彲浠ュ湪婧愪唬镰佷腑浣跨敤绗﹀彿淇濈暀鎸囦护𨱒ユ带鍒堕偅浜涚﹀彿闇瑕佷缭鐣 绗﹀彿淇濈暀鎸囦护鏄涓涓狫ava鏂囨。娉ㄩ喷鎸囦护 鍙浠ユ彃鍏ュ湪绫诲拰绫绘垚锻樼殑鏂囨。娉ㄩ喷涓 渚嫔 銆銆銆銆 /**銆銆銆銆銆* This class should preserve 銆銆銆銆銆* @preserve銆銆銆銆銆*/銆銆銆銆 public class Foo {銆銆銆銆銆銆 /**銆銆銆銆銆銆銆* You can specify which field should be preserved 銆銆銆銆銆銆銆* @preserve銆銆銆銆銆銆銆*/銆銆銆銆銆銆 private int x;銆銆銆銆銆銆銆銆 /**銆銆銆銆銆銆銆* This field is not preserved 銆銆銆銆銆銆銆*/銆銆銆銆銆銆 private int y;銆銆銆銆銆銆銆銆 /**銆銆銆銆銆銆銆* You can also preserve methods 銆銆銆銆銆銆銆* @preserve銆銆銆銆銆銆銆*/銆銆銆銆銆銆 public void hello() {}銆銆銆銆銆銆銆銆 /**銆銆銆銆銆銆銆* This method is not preserved 銆銆銆銆銆銆銆*/銆銆銆銆銆銆 private void collect() {}銆銆銆銆 }銆銆濡傛灉娌℃湁@preserve鎸囦护 鍒欐牴鎹娣锋穯绾у埆鍙婃垚锻樼殑璁块梾绾у埆𨱒ョ‘瀹氱﹀彿鏄钖︿缭鐣 銆銆銆銆瀵逛簬绫荤殑绗﹀彿淇濈暀鎸囦护鍙浠ラ梼甯︿竴涓淇?鐣欑骇鍒鍙傛暟 𨱒ユ带鍒剁被鎴愬憳镄勭﹀彿淇濈暀 鍖呮嫭 銆銆銆銆 @preserve銆銆銆銆銆銆浠呭圭被钖嶈繘琛屼缭鐣 绫绘垚锻樼殑淇濈暀镙规嵁 Xobfuscate锻戒护琛屽弬鏁板喅瀹氥銆銆銆 @preserve public銆銆 淇濈暀镓链塸ublic鎴愬憳銆銆銆銆 @preserve protected銆淇濈暀镓链塸ublic鍜宲rotected鎴愬憳銆銆銆銆 @preserve package銆銆淇濈暀镓链塸ublic protected package private鎴愬憳銆銆銆銆 @preserve private銆銆淇濈暀镓链夋垚锻樸銆銆銆 @preserve all銆銆銆銆鐩稿綋浜嶡preserve private銆銆銆銆 Q: JOC链夊摢浜涢檺鍒讹纻 銆銆銆銆A: 涓嶆敮鎸佸垎鍒缂栬疟 蹇呴’瀵规墍链夌殑婧愭枃浠惰繘琛屾贩娣嗙紪璇 銆銆銆銆銆銆链钖庣粰鍑轰竴涓狫OC娣锋穯镄勬晥鏋 銆銆銆銆婧愭枃浠 銆銆銆銆import java awt event *;銆銆import javax swing *;銆銆銆銆public class AboutBox extends JDialog銆銆{銆銆 public AboutBox()銆銆 {銆銆銆銆 initform();銆銆 }銆銆銆銆 JPanel panel = new JPanel();銆銆 JButton button = new JButton();銆銆 JLabel jLabel = new JLabel();銆銆 JTextArea jTextArea = new JTextArea();銆銆銆銆 /**銆銆銆* NOTE: The following code is required by the form designer 銆銆銆* It can be modified using the form editor 銆Do not銆銆銆* modify it using the code editor 銆銆銆*/銆銆銆銆 private void initform()銆銆 {銆銆銆銆 this setDefaultCloseOperation( WindowConstants DISPOSE_ON_CLOSE );銆銆銆銆 this getContentPane() setLayout( new java awt CardLayout());銆銆銆銆 this setModal( true );銆銆銆銆 this setResizable( false );銆銆銆銆 this setTitle( About );銆銆銆銆 panel setLayout( null );銆銆銆銆 button setText( OK );銆銆銆銆 button setBounds( );銆銆銆銆 panel add( button );銆銆銆銆 jLabel setText( File System Viewer for Swing );銆銆銆銆 jLabel setVerticalAlignment( SwingConstants TOP );銆銆銆銆 jLabel setBounds( );銆銆銆銆 panel add( jLabel );銆銆銆銆 jTextArea setFont( new java awt Font( Dialog ));銆銆銆銆 jTextArea setLineWrap( true );銆銆銆銆 jTextArea setOpaque( false );銆銆銆銆 jTextArea setText( This puter program is protected by right law );銆銆銆銆 jTextArea setWrapstyleWord( true );銆銆銆銆 jTextArea setBounds( );銆銆銆銆 panel add( jTextArea );銆銆銆銆 this getContentPane() add( panel Card );銆銆銆銆 this setSize( );銆銆銆銆 button addActionListener( new java awt event ActionListener(){銆銆銆銆銆銆銆銆 public void actionPerformed( java awt event ActionEvent ev ){銆銆銆銆銆銆銆銆銆 ?銆button _actionPerformed( ev );銆銆銆銆銆銆銆銆 }});銆銆 }銆銆銆銆 private void button _actionPerformed(ActionEvent ev)銆銆 {銆銆銆銆 this dispose();銆銆 }銆銆}銆銆銆銆缁廕avac缂栬疟钖庣敤JAD鍙岖紪璇戠殑缁撴灉 銆銆銆銆import java awt *;銆銆import java awt event ActionEvent;銆銆import java awt event ActionListener;銆銆import javax swing *;銆銆import javax swing text JTextComponent;銆銆銆銆public class AboutBox extends JDialog銆銆{銆銆銆銆 JPanel panel ;銆銆 JButton button ;銆銆 JLabel jLabel ;銆銆 JTextArea jTextArea ;銆銆銆銆 public AboutBox()銆銆 {銆銆銆銆 panel = new JPanel();銆銆銆銆 button = new JButton();銆銆銆銆 jLabel = new JLabel();銆銆銆銆 jTextArea = new JTextArea();銆銆銆銆 initform();銆銆 }銆銆銆銆 private void initform()銆銆 {銆銆銆銆 setDefaultCloseOperation( );銆銆銆銆 getContentPane() setLayout(new CardLayout());銆銆銆銆 setModal(true);銆銆銆銆 setResizable(false);銆銆銆銆 setTitle( About );銆銆銆銆 panel setLayout(null);銆銆銆銆 button setText( OK );銆銆銆銆 button setBounds( );銆銆銆銆 panel add(button );銆銆銆銆 jLabel setText( File System Viewer for Swing );銆銆銆銆 jLabel setVerticalAlignment( );銆銆銆銆 jLabel setBounds( );銆銆銆銆 panel add(jLabel );銆銆銆銆 jTextArea setFont(new Font( Dialog ));銆銆銆銆 jTextArea setLineWrap(true);銆銆銆銆 jTextArea setOpaque(false);銆銆銆銆 jTextArea setText( This puter program is protected by right law );銆銆銆銆 jTextArea setWrapstyleWord(true);銆銆銆銆 jTextArea setBounds( );銆銆銆銆 panel add(jTextArea );銆銆銆銆 getContentPane() add(panel Card );銆銆銆銆 setSize( );銆銆銆銆 button addActionListener(new ActionListener() {銆銆銆銆銆銆銆銆 public void actionPerformed(ActionEvent actionevent)銆銆銆銆銆銆 {銆銆銆銆銆銆銆銆 button _actionPerformed(actio lishixin/Article/program/Java/JSP/201311/19213

2. java代码混淆方式

Java代码混淆方式主要包括以下几种：

1. 对.class文件进行加密：

   • 核心思想：通过加密技术保护.class文件内容，防止直接访问和理解。
   • 优点：提供较高的安全性。
   • 缺点：实施复杂，需要自定义classloader来解密，增加了开发和维护成本。

2. 使用花指令：

   • 核心思想：在代码中插入无意义的或难以理解的指令，以增加反编译的难度。
   • 优点：操作相对简单，能在一定程度上防止反编译。
   • 缺点：安全性相对较低，存在针对特定花指令的破解工具。

3. 直接混淆代码：

   • 核心思想：通过重命名类、方法、变量等，以及改变代码结构，提升代码的阅读难度。
   • 优点：操作相对简单，是最常见的代码保护手段。
   • 缺点：虽然能增加代码理解的难度，但无法完全防止逆向工程。

在实际应用中，通常会结合多种混淆方式来增强代码保护的效果。同时，也需要注意混淆可能对代码性能和执行效率带来的影响，以及混淆后可能出现的调试和测试难度增加等问题。