Reverse Engineering

Overview

Overview

Overview

Need for RE

• Recovery of lost information– providing proper system documentation

• Assisting with maintenance– identification of side effects and anomalies

• Migration to another hw/sw platform • Facilitating software reuse

Example: Java Decompiler

• How to recover bytecode from .class file under Unix/Win with JDK? % javap -c <filename>% javap -help (to see the options)

• Java Decompilers - Jadclipse– ”ClassCracker” http://www.pcug.org.au/~mayon/

– “DeCafe Pro" from DeCafe, France at http://decafe.hypermart.net/index.htm

Class cracker JD

Decompile .net

• There are two tools that I like to use to decompile

• Reflector– www.reflector.net (paid)

• ILSpy– http://wiki.sharpdevelop.net/ILSpy.ashx (free)

8

ILSpy

9

Reflector

10

Swf decompiler for flash