> For the complete documentation index, see [llms.txt](https://riteshs4hu.gitbook.io/infosec-notes/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://riteshs4hu.gitbook.io/infosec-notes/android-appsec/fundamenteals.md).

# Fundamenteals

- [Introduction](https://riteshs4hu.gitbook.io/infosec-notes/android-appsec/fundamenteals/introduction.md)
- [It's Architecture](https://riteshs4hu.gitbook.io/infosec-notes/android-appsec/fundamenteals/its-architecture.md)
- [Android Virtual Machine (AVM)](https://riteshs4hu.gitbook.io/infosec-notes/android-appsec/fundamenteals/android-virtual-machine-avm.md)
- [File System & Permissions](https://riteshs4hu.gitbook.io/infosec-notes/android-appsec/fundamenteals/file-system-and-permissions.md)
- [APK & App Components](https://riteshs4hu.gitbook.io/infosec-notes/android-appsec/fundamenteals/apk-and-app-components.md)
- [DEX, ODEX and OAT Files](https://riteshs4hu.gitbook.io/infosec-notes/android-appsec/fundamenteals/dex-odex-and-oat-files.md)
- [AIDL & Messenger](https://riteshs4hu.gitbook.io/infosec-notes/android-appsec/fundamenteals/aidl-and-messenger.md)
- [App Signing](https://riteshs4hu.gitbook.io/infosec-notes/android-appsec/fundamenteals/app-signing.md)