Encrypted File System for Rust/Android Applications by Stefan Schindler - Rust Zürisee Feb 2023

• Using a separate file system implementation can provide a higher degree of security and control, especially on Android devices.
• Master keys used for encryption should be handled carefully to avoid potential security vulnerabilities.
• Use of reference counting objects requires careful consideration to avoid bugs and maintain system stability.
• CMake can be used to create custom build configurations with ease.
• There are benefits to using a combination of CPU-based and hardware-accelerated implementations for certain cryptographic functions.
• Trust issues arise when users have little control over the operating system and hardware security.
• CryptoFS ensures security by generating a new 64-bit int to hide AES.
• Gradle plugin helps with incremental builds when needed.
• Implementing end-to-end encryption without relying on operating system can be possible using a trusted hardware Security Module (HSM) or a specialized software.
• Using a Rust library for the filesystem can ease the development of this system.
• Proper memory management is necessary to prevent timing attacks.
• Cryptographic padding for the AES box cipher using the AEAD approach can be added for better security.
• The size of the input length plays a crucial factor in generating the correct amount of cryptographic keys.
• Reference counting techniques can help manage objects in software, but they need to be considered in the scope of the design.
• Using a CMake custom command can handle the generation and distribution of cryptographic keys.
• Digital signature verification through the poly1305 algorithm ensures the verification of file integrity.
• Timing attacks during cryptographic operations can lead to unwanted outcomes.
• Reference counting issues in Rust lead to segmentation faults.
• Implementation of cross-compilation toolchains for FFI allows for different architectures.

Let me know if you need the points re-organized for easier reading or if you require further clarification on any point.