The document discusses reverse engineering of Android applications. It explains that reverse engineering is the process of analyzing how a system works by examining its components. It then provides information on decompiling Android apps from dex to Smali code, tools used in the process like APKTool and dex2jar, and potential purposes of reverse engineering like security analysis or app modification. Common issues that can be discovered through reverse engineering are also mentioned, such as private data access or cheating vulnerabilities.

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2. Is the process of discovering the technological
Reverse principles of a device, object, or system through
Engineering analysis of its structure, function, and operation
1
1Eilam, Eldad & Chikofsky, Elliot J. (2007).
Reversing: secrets of reverse engineering.
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3. Valuable data
Purpose
Interfacing
Security analysis
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4. Android Compiling Coding in Java
process
Compiling to Dalvik
Packaging
Distribution
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5. (de)distribution Pulling from device
Directly download via googleplay-pythonapi
Download from web
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6. (de)distribution
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7. (de)packaging From dex to .smali or .java
(de)compiling
dex2jar
apktool
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8. Smali
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9. APK Tool https://code.google.com/p/android-apktool/
downloads/list
Jar Signer http://docs.oracle.com/javase/1.3/docs/
tooldocs/win32/jarsigner.html
Keytool http://docs.oracle.com/javase/6/docs/
technotes/tools/windows/keytool.html
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10. Crackme http://crackmes.de/users/deurus/
android_crackme03/
dex2jar
http://code.google.com/p/dex2jar/
JD-GUI http://java.decompiler.free.fr/
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11. Smali http://pallergabor.uw.hu/androidblog/
dalvik_opcodes.html
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12. Security Tokens
Private addresses
Unauthorized access
Cheating
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13. Proguard Obfuscating and optimizing tool
http://developer.android.com/tools/help/
proguard.html
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14. Thank you!
+ http://goo.gl/t4AVh
@eenriquelopez
http://www.neo-tech.es
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