🔐 APK Asset Encryption & Injection Workflow
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1
Decode APK (apktool)
Decompile the APK to access its internal structure, assets, and Smali code
apktool d input.apk -o decoded_apk/
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2
Collect Asset Inventory
Scan and catalog all assets that need encryption (images, sounds, data files, etc.)
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3
Encrypt Assets (AES-256-CBC)
Apply strong encryption to all identified assets and overwrite original files
🔑 Generate unique encryption keys
🔒 Encrypt each asset with AES-256-CBC
💾 Overwrite original files with encrypted versions
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4
Inject AES Decryptor Smali Classes
Add custom decryption logic to handle encrypted assets at runtime
📝 Create AESDecryptor.open() method
📝 Create AESDecryptor.openFd() method
🔧 Inject Smali classes into decoded APK
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5
Patch Smali Files
Modify existing code to redirect asset access through decryption layer
5.1 AssetManager.open() Calls
Replace with → AESDecryptor.open
5.2 AssetManager.openFd() Calls
Extract Context Register → Replace with AESDecryptorFd.openAssetFd
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6
Rebuild APK (apktool)
Recompile the modified APK with encrypted assets and patched code
apktool b decoded_apk/ -o rebuilt.apk
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7
Sign APK (Uber APK Signer)
Apply digital signature to ensure APK integrity and enable installation
java -jar uber-apk-signer.jar --apks rebuilt.apk
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