Mods SecureChat - AES-128 Chat Encryption

SecureChat - AES-128 Chat Encryption​

SecureChat is a lightweight, client-side Fabric mod designed for Minecraft 1.21.x (tested up to 1.21.11). It allows players to communicate securely using high-level AES-128 encryption.

By using a shared secret key, only users with the same password can read the messages. To anyone else (including server admins and console logs), the messages appear as unreadable encrypted strings.

Features​

• AES-128 Symmetric Encryption: Secure your conversations with industry-standard encryption.
• Full Privacy: The mod intercepts and blocks original messages before they reach the server. Only the encrypted version is sent.
• Private Message Support: Works with /msg, /tell, and /w commands.
• Client-Side Only: No server-side installation required. Works on any server as long as both parties have the mod.
• On-the-fly Key Change: Update your encryption password at any time without restarting the game.

Installation​

1. Ensure you have the Fabric Loader installed for Minecraft 1.21.x.
2. Download the latest SecureChat.jar from the Releases page.
3. Place the .jar file into your .minecraft/mods folder.

How to Use​

Both you and the person you want to talk to must have the mod installed and use the exact same password.

1. Set your Password​

First, define your secret key. Only players with this key can decrypt your messages. /enc-key <your_password>

2. Enable Encryption​

By default, the mod is disabled. Turn it on to start encrypting outgoing messages. /enc-on

3. Send Messages​

Simply type in chat or use private commands.

• Hello everyone! -> Sent as [AES] Gx7zR9...
• /msg PlayerName Secret info -> Sent as /msg PlayerName [AES] u8B2p...

4. Disable Encryption​

If you want to go back to normal, unencrypted chat: /enc-off

Security Note​

This mod uses SHA-256 to derive a 128-bit key from your password and AES/ECB/PKCS5Padding for message encryption. Never use your real-life sensitive passwords (bank, email, etc.) as an encryption key.