randar-explanation
"Randar" is an exploit for Minecraft which uses LLL lattice reduction to crack the internal state of an incorrectly reused java.util.Random in the Minecraft server, then works backwards from that to locate other players currently loaded into the world.
What to know before exploring
What it is
"Randar" is an exploit for Minecraft which uses LLL lattice reduction to crack the internal state of an incorrectly reused java.util.Random in the Minecraft server, then works backwards from that to locate other players currently loaded into the world.
GitHub
Where it is used
No documented product use has been verified yet.
What people are saying
No recommendation phrase was found in the indexed comments.
No classified warning is attached to this page. Read the discussions before treating silence as approval.
Also in these discussions
No other repository is repeatedly linked in the same discussions.
This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 3:03:16 PM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
Observed mentions: 2024-04-17 17:42:51 UTC to 2024-05-07 01:46:26 UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| Apr 17 | 2024-04-17 00:00:00 UTC | 2024-04-18 00:00:00 UTC | 1 | 1 | 0 |
| Apr 18 | 2024-04-18 00:00:00 UTC | 2024-04-19 00:00:00 UTC | 0 | 0 | 0 |
| Apr 19 | 2024-04-19 00:00:00 UTC | 2024-04-20 00:00:00 UTC | 0 | 0 | 0 |
| Apr 20 | 2024-04-20 00:00:00 UTC | 2024-04-21 00:00:00 UTC | 0 | 0 | 0 |
| Apr 21 | 2024-04-21 00:00:00 UTC | 2024-04-22 00:00:00 UTC | 1 | 1 | 0 |
| Apr 22 | 2024-04-22 00:00:00 UTC | 2024-04-23 00:00:00 UTC | 0 | 0 | 0 |
| Apr 23 | 2024-04-23 00:00:00 UTC | 2024-04-24 00:00:00 UTC | 0 | 0 | 0 |
| Apr 24 | 2024-04-24 00:00:00 UTC | 2024-04-25 00:00:00 UTC | 0 | 0 | 0 |
| Apr 25 | 2024-04-25 00:00:00 UTC | 2024-04-26 00:00:00 UTC | 0 | 0 | 0 |
| Apr 26 | 2024-04-26 00:00:00 UTC | 2024-04-27 00:00:00 UTC | 0 | 0 | 0 |
| Apr 27 | 2024-04-27 00:00:00 UTC | 2024-04-28 00:00:00 UTC | 0 | 0 | 0 |
| Apr 28 | 2024-04-28 00:00:00 UTC | 2024-04-29 00:00:00 UTC | 0 | 0 | 0 |
| Apr 29 | 2024-04-29 00:00:00 UTC | 2024-04-30 00:00:00 UTC | 0 | 0 | 0 |
| Apr 30 | 2024-04-30 00:00:00 UTC | 2024-05-01 00:00:00 UTC | 0 | 0 | 0 |
| May 1 | 2024-05-01 00:00:00 UTC | 2024-05-02 00:00:00 UTC | 0 | 0 | 0 |
| May 2 | 2024-05-02 00:00:00 UTC | 2024-05-03 00:00:00 UTC | 0 | 0 | 0 |
| May 3 | 2024-05-03 00:00:00 UTC | 2024-05-04 00:00:00 UTC | 0 | 0 | 0 |
| May 4 | 2024-05-04 00:00:00 UTC | 2024-05-05 00:00:00 UTC | 0 | 0 | 0 |
| May 5 | 2024-05-05 00:00:00 UTC | 2024-05-06 00:00:00 UTC | 0 | 0 | 0 |
| May 6 | 2024-05-06 00:00:00 UTC | 2024-05-07 00:00:00 UTC | 0 | 0 | 0 |
| May 7 | 2024-05-07 00:00:00 UTC | 2024-05-08 00:00:00 UTC | 1 | 0 | 1 |
What Hacker News says
3 sourcesMinecraft Randar exploit explanation
1 points · Open discussionRandar: A Minecraft exploit that uses LLL lattice reduction to crack server RNG
530 points · Open discussion