MX2: A minimal encrypted container using Argon2id and XChaCha20-Poly1305 (github.com)

MX² (MAX 2 eXcryption) has been announced as a minimal, open-source, password-protected container format designed to securely store high-entropy secrets using established cryptographic techniques—specifically Argon2id for password hardening and XChaCha20-Poly1305 for encryption. This format emphasizes portability, auditability, and independence from any specific application or ecosystem, making it versatile for use cases like encrypted backups, QR-safe secret transport, and deterministic key derivation without relying on proprietary algorithms. The container format allows users to derive multiple cryptographic keys from two internally stored secret phrases while ensuring that no private keys are saved on disk, thus enhancing security. The significance of MX² for the AI/ML community lies in its deterministic key-generation model, which permits the creation of an infinite number of keys from a single root without storing sensitive data externally. This not only enhances recoverability and auditability but also allows researchers and developers to build applications with consistent cryptographic practices. MX²’s design fosters transparency and reproducibility, key aspects in the modern cryptographic landscape, as it allows anyone to inspect and verify the integrity of the implementation across different platforms, paving the way for more secure and interoperable systems in AI and beyond.