Open Source Dart Cryptography Software

T2DECODE is an open-source (GPLv3) desktop application designed for learning cybersecurity, networks, and systems 100% offline. Developed by the TUTODECODE association, it follows the "Privacy by Design" principle: zero telemetry, zero cloud dependencies, and total sovereignty over your data. Key learning modules: - Networking: Subnet mask simulator and calculations. - System: Interactive chmod permission manager. - Cryptography: Local hash functions (SHA, MD5, etc.). - Local AI: Optional integration with Ollama to run LLMs (like Llama 3) locally for student assistance. Ideal for IT students (BTS SIO, BUT Informatique), air-gapped environments, or users in white zones without internet access. Built with Flutter for Windows, macOS, Linux, and Android.