Symmetry Breaking
Definition
For a pair of symmetrical actions, some restrictions are missing on one side thus the security symmetry is broken, which can be exploited potentially.
Examples of Symmetry
Deposit(Start Earn) - Withdraw(Finish Earn)
Stake - Unstake
Check-in - Check-out
Symmetry Breaking
In these paired actions, eg. Stake - Unstake, if you missed some checks while unstaking(eg., terminate staking rewards), the system becomes asymmetrical immediately, i.e. lots of rewards are distributed to the people who are already left and not qualified for rewards.
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