"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. - randar-explanation/README.md at master · spawnmason/randar-explanation

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The Randar exploit in Minecraft allows players to determine the in-game locations of other players by cracking the internal state of the game's random number generator. This exploit is present in Minecraft versions Beta 1.8 through 1.12.2.