This is a Scratch 3 extension that enables E2EE (End-to-End Encryption). This E2EE extension utilizes the same underlying cryptography code that powers CloudLink Omega.
This extension implements ECDH-P256-AES-GCM with SPKI-BASE64 keypairs, allowing Scratch projects to send/receive data over a wide variety of transports. It is highly resistant to attacks, and supports creating shared secrets over insecure channels (e.g. cloud variables).
Elliptic-curve Diffie–Hellman is a key agreement protocol that allows two parties to establish a shared encryption secret over an insecure channel. This takes advantage of a epiliptic curve keypair.
NIST P-256 is an implementation of a epiliptic curve, providing 256-bit keys that makes ECDH work.
Advanced Encryption Standard is a symmetric encryption algorithm that utilizes public/private keys for encrypting/decrypting data. In this extension, this takes advantage of a shared key (secret), made possible by ECDH-P256.
Galois/Counter Mode improves performance of AES. In short, it provides authenticated encryption and integrity checking, all with great speed and low latency.
Simple Public Key Infrastructure (Pronounced Spoo-Key) simplifies linking things to keys, in favor of typical X.509-based public keys. This extension simplifies these keys into Base64 encoding that can be easily transmitted or shared.
Since Scratch does not have any concept of "secure" data storage; you should be mindful of how you store your keys. A flawed implementation of this extension can put your transmitted data at risk.
