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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. ...

Note: this is alpha-quality software, and isn't ready for production use. STROBE is a lightweight framework for cryptographic protocols. It supports encryption/decryption, hashing, pseudorandom generation and message authentication. It integrates these components in an innovative way that makes secure protocol design relatively simple. With the included elliptic curve code, STROBE additionally supports asymmetric key exchange and digital signature creation and verification.

AUM is an extremely fast, small-state, cryptographically secure pseudo-random number generator and stream cipher. AUM exhibits uniform distribution, mixes rapidly, has no detected bias, and comes in three variants: AUM16, with an internal state array of 16+4 32-bit words; AUM32, with an internal state of 32+4 words; and AUM64 with a 64+4-word state. The former permit seeding with a key of up to 512 or 1024 bits, the latter with a 2048-bit key.

HcryptoJ (Historical cryptology in Java) is a Java based programming library for implementing and analyzing historical ciphers. HcryptoJ is designed to support research and teaching in historical cryptography and computer science. Licensed under GPL.

A powerful, provider-based .NET CAPTCHA control with audio challenge and Microsoft Visual Studio design-time support.