authlogic
by 5w14
authlogic gives servers a hybrid authentication method in which each player creates a password once and the server and client verify each other with keys.
What it does
Installation is done on both the server and the player side, with the server set to online-mode false. During setup the owner enters a password once. A player then uses that password to generate a unique key for the server, and the server sends its own public key in return. The player checks the server's key and sends back their own public key, so each side confirms the other before the session starts. An optional whitelist can be configured to limit who may join.
The mod is built for modded servers that want authentication without an official account. It is published for Fabric, Forge and NeoForge across 12 release versions, 1.20.1 – 1.21.11, and it runs on client and server, so the server and every player need it. The code is MIT licensed and open source, and the author notes that the authlogic folder should be shared between installs.
Key features
Password setup
The password is entered once during setup and then used to derive a unique key for each server.
Mutual key verification
The server sends its public key, the player verifies it, and the player returns a public key of their own.
Optional whitelist
Server owners can restrict joins to a whitelist configured alongside the authentication setup.
No official account
Authentication runs without a Mojang or Microsoft account, which suits servers that run with online-mode false.
Compatibility
Latest build for each game version and loader.
1.21.x11 of 11 versions with builds
1.20.x1 of 1 version with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Offline-mode servers
Owners who turn off online-mode can use the key exchange to confirm that joining players and the server are who they claim to be.
Small private communities
A password set once and a whitelist give a small group a simple way in without an account system.
Who it’s for: Server owners who run modded servers with online-mode false and want a simple authentication step, and players who join those servers. It suits communities that do not use official accounts.
How it compares
PasswordGate is a Forge and NeoForge mod for client and server that is open source under the Apache License 2.0 and published for 1.20.1 – 1.21.1. WhitelistGate is server-side only, so players join without installing it, and it is also open source under the Apache License 2.0 for 1.20.1 – 1.21.1. DAuthentication is a Forge-only mod for 1.20.1 with an All rights reserved license and no open source code.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| authlogic | Fabric, Forge and NeoForge | 1.20.1 – 1.21.11 | Client and server | 2026-09-03 |
| PasswordGate | Forge and NeoForge | 1.20.1 – 1.21.1 | Client and server | 2026-08-10 |
| WhitelistGate | Forge and NeoForge | 1.20.1 – 1.21.1 | Server-side only | 2026-07-26 |
| DAuthentication | Forge | 1.20.1 | Client and server | 2026-02-18 |
Questions
Does authlogic need to be installed on the server?
Which loaders does authlogic support?
Does a player need an official account to join?
In the catalog
authlogic is one of 8,016 Management mods on ModsFinder, and one of 5,930 Management mods for Fabric. 19,862 mods support Minecraft 1.21.11.
More from 5w14
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Official listing
- Modrinth page
- modrinth.com/mod/authlogic
- Owner
- 5w14
- Published
- 2026-01-01
- Updated on Modrinth
- 2026-09-03
- Facts verified
- 2026-10-15