Make seed number hard to crack.

bada-studio / knights_contract

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Make seed number hard to crack. #67

Closed mjshin82 closed 5 years ago

mjshin82 commented 5 years ago

There is some random-seed seeking attack. We think that one of player's account(v.io) tries to buy materials and craft high-quality item. This account could not change the value but maybe can guess what percent will be applied this time.

To make impossible to calculate the random value, we use these value for the seed:

[x] Custom transaction hash
[x] Checksum
[x] Last block's hash
[x] And others

mjshin82 commented 5 years ago

We have 'CONTRACT BUG BOUNTY' program up to 200 EOS. (It's increased from 100 EOS) If you found a bug or security issue on our contract, please contact us rather than attack.