OfflineEncryptor

A plugin that enable vanilla Minecraft's encryption for offline-mode servers.

Please see github page for further information.

Compatibility & Installation

Just drop it in to plugin folder, nothing need to change, no data will be modified (UUID, username, etc.).

This plugin also support dynamic loading/unloading by PlugManX.

Supported Versions

Paper / Purpur / Leaves / Leaf / other Paper-downstream

• Version: 1.20.5+
• Install if not using proxy like Velocity.
• Running it on older versions will fail because encryption logic changed in 1.20.5.

Velocity Proxy

• Version: 3.4.0+
• Install the plugin only on Velocity if Velocity is present.
• This plugin in the backend server won't operate when using Velocity

Client Requirements

• Minecraft client 1.20.5 or newer: Mojang changed the handshake and encryption flow in 1.20.5. Older clients cannot complete the encryption sequence. This plugin will not send encrypted request packet to players with older versions.
• ViaVersion can down-translate gameplay packets, but encryption still requires the real client version to be 1.20.5+.

Compatibility

Plugin / Server features	Compatibility
ViaVersion/VB/VR/VFP	Full
Leaf PreAuthenticateEvent	Full
LimitedOfflineMode	Full
Velocity PreLoginEvent	Full
FastLogin	Requires fork version on bukkit

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Netty pipeline after installed this plugin with ViaVersion.