Covert Java

Techniques for Decompiling, Patching, and Reverse Engineering

By: Alex Kalinovsky

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Paperback | 3 May 2004

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Developers face problems created by others every day - when asked to maintain someone else's code, or when forced to use a third-party library without documentation. They might come across exactly the feature they need to implement but can't get hold of the source code. They might spend frustrating hours trying different solutions that don't work. Instead, the techniques in this book will teach developers to decompile, patch, and reverse-engineer applications, to better understand their implementation, and to work more efficiently with applications developed by others.Covert Java offers a unique approach to solving common Java problems, from combating obfuscation in code, to patching core classes to change the intended function of an application. Each chapter focuses on a technique that solves a specific problem - outlining the problem, demonstrating the solution, then suggesting additional ideas for developers to test out the technique. Many chapters include anecdotal examples of the technique in action, and finish with summaries to ensure developers understand the most crucial points of the chapter.

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Non-Fiction Computing & I.T.Computer Programming & Software Development Program Concepts & Learning to Program Compilers & Interpreters Object-Oriented Programming or OOP Web Programming Software Engineering Programming & Scripting Languages

Introduction
Getting Started
Techniques Overview
When and Why to Use Each Method
Improving Productivity with File Managers
Sample Application Functionality and Structure
Quick Quiz
In Brief
Decompiling Classes
Determining When to Decompile
Knowing the Best Decompilers
Decompiling a Class
What Makes Decompiling Possible?
Potential Problems with Decompiled Code
Quick Quiz
In Brief
Obfuscating Classes
Protecting the Ideas Behind Your Code
Obfuscation As a Protection of Intellectual Property
Transformations Performed by Obfuscators
Knowing the Best Obfuscators
Potential Problems and Common Solutions
Using Zelix Klass Master to Obfuscate a Chat Application
Cracking Obfuscated Code
Quick Quiz
In Brief
Hacking Non-Public Methods and Variables of a Class
Accessing Packages and Protected Class Members
Accessing Private Class Members
Quick Quiz
In Brief
Replacing and Patching Application Classes
What Do We Do When We Have Tried Every Road but Failed?
Finding the Class That Has to Be Patched
A Sample Scenario That Requires Patching
Patching a Class to Provide New Logic
Reconfiguring the Application to Load and Use the Patched Class
Patching Sealed Packages
Quick Quiz
In Brief
Using Effective Tracing
Introduction to Tracing
Tracing As an Effective Method of Learning the Software
Tracing and Logging Tools and APIs
Tracing Dos and Donts
Quick Quiz
In Brief
Manipulating Java Security
Java Security Overview
Bypassing Security Checks
Quick Quiz. In Brief
Snooping the Runtime Environment
The Value of Understanding the Runtime Environment
System Properties
System Information
Memory Information
Network Information
Accessing Environment Variables
Quick Quiz
In Brief
Cracking Code with Unorthodox Debuggers
Understanding the Internals of Unknown Applications
Conventional Debuggers and Their Limitations
Hacking with an Omniscient Debugger
Quick Quiz
In Brief
Using Profilers for Application Runtime Analysis
Why and When You Should Use Profiling
The Best Profilers for Java
Investigating Heap Usage and Garbage Collection Frequency to Improve the Performance
Browsing Object Allocation and References to Find and Fix Memory Leaks
Investigating Thread Allocation and Synchronization
Identifying Expensive Methods to Improve Performance
Investigating an Application at Runtime Using a Thread Dump
Quick Quiz
In Brief
Load-Testing to Find and Fix Scalability Problems
The Importance of Load-Testing
Load-Testing RMI-Based Servers with JUnit
Load-Testing with JMeter
Quick Quiz
In Brief
Reverse Engineering Applications
User Interface Elements and Resources
Hacking Text
Hacking Images
Hacking Configuration Files
Quick Quiz
In Brief
Eavesdropping Techniques
Eavesdropping Defined
Eavesdropping on HTTP
Eavesdropping on the RMI Protocol
Eavesdropping on JDBC Driver and SQL Statements
Quick Quiz
In Brief
Controlling Class Loading
JVM Internals from a Class Loading Perspective
Writing a Custom Class Loader
Quick Quiz
In Brief
Replacing and Patching Core Java Classes
Why Bother?
Patching Core Java Classes Using the Boot Class Path
Example of Patching java.lang.Integer
Quick Quiz
In Brief
Intercepting Control Flow
Control Flow Defined
Intercepting System Errors
Intercepting System Streams
Intercepting a Call to System.exit
Reacting to a JVM Shutdown Using Hooks
Intercepting Methods with a Dynamic Proxy
The Java Virtual Machine Profiler Interface
Quick Quiz
In Brief
Understanding and Tweaking Bytecode
Bytecode Fundamentals
Table of Contents provided by Publisher. All Rights Reserved.

Covert Java

Techniques for Decompiling, Patching, and Reverse Engineering

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