Submission Details
Severity:
`RapBattle::_battle` uses a weak PRNG resulting in an exploitable and predictable outcome
Summary
Weak PRNG due to a modulo on block.timestamp.
Vulnerability Details
uint256 random =
uint256(keccak256(abi.encodePacked(block.timestamp, block.prevrandao, msg.sender))) % totalBattleSkill;
Impact
This can be exploited by miners to influence the outcome of the battle.
Tools Used
Slither
Recommendations
Do not use block.timestamp as a source of randomness
Rewards breakdown
nSLOC
201This contest has a flat reward structure with the following payouts:
100 EXP
20 EXP
2 EXP
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