Roshambo Alternatives
Similar projects and alternatives to Roshambo
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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.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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LattiCG
Reverses the internal seed(s) of JavaRandom given information on its output in the form of a system of inequalities on various Random calls. Works by reducing the problem to finding certain vectors in a lattice, which is then solved through a branch and bound algorithm using a reduced version of the lattice.
Roshambo reviews and mentions
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Randar: A Minecraft exploit that uses LLL lattice reduction to crack server RNG
- It plays randomly for the first 998 turns (https://github.com/MrValdez/Roshambo/blob/master/rsb-iocaine...): this line is "if (*turn < trials - 2) return libra ? callback() : random() % 3;", and "libra" is initalized to (int) NULL, i.e. zero, on every invocation.
- In the last 2 turns, it uses `find_goodkarma` to comb through the stack to find where the variables that match its history and the opponents' history are stored. These the stack arrays p1hist and p2hist (https://github.com/MrValdez/Roshambo/blob/master/rsb-iocaine...)
They're easy to find because they contain 998 known values each in a ~random sequence of (0, 1, 2), and they're just upwards of the stack from the current invocation of the Psychic Friends Network.
`find_goodkarma` simply increments a pointer until the whole sequence of 998 values matches the known history.
- Then, it rewrites the history to make itself win. These lines (https://github.com/MrValdez/Roshambo/blob/master/rsb-iocaine...) never get executed, then these lines (https://github.com/MrValdez/Roshambo/blob/master/rsb-iocaine...) tally up draws so far (libra), wins (cancer) and losses (scorpio).
This line makes sure its move is the opponents' move +1 mod 3, which is the winning move: https://github.com/MrValdez/Roshambo/blob/master/rsb-iocaine...
Then, these lines repeat the same trick for the number of wins and losses. It checks whether it's p1 or p2 by comparing the addresses of the win/loss arrays, and then overwrites the wins/losses appropriately using `pizza` https://github.com/MrValdez/Roshambo/blob/master/rsb-iocaine...
in the end it returns an arbitrary value (the address of `good_hand` mod 3).
It was fun to follow but the result is kind of boring :)
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MrValdez/Roshambo is an open source project licensed under GNU General Public License v3.0 or later which is an OSI approved license.
The primary programming language of Roshambo is C.
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