Comments (6)
但是奇怪的是
tapos_block_prefix
这个数不是未来区块的么?
黑客怎么提前拿到的?
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謝謝.
原因估計是這樣,
只要黑客拿到當前的區塊hash后,
快速的發送給合約,那麼合約就能算出來 當前區塊的tapos_block_prefix
然後快速的與bocai合約交互(在下一個塊提交成功,則隨機數被破解了)
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@jin10086 你好,我不明白为什么需要延迟两次。这样做的用意是什么呢?延迟开奖不就已经能让tapos_block_prefix无法被预测到吗?@loveblockchain 的解释用获取当前区块的tapos_block_prefix,然后迅速与bocai合約交互,我无法理解这样做能计算出未来的tapos_block_prefix值!
下注和开奖不是同时进行的话,用tapos_block_prefix来做为随机源还是不安全的吗?
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@wangyilin1987
可以看下这篇文章,里面几个引用也一起看看,此地无人生还:区块链随机数的原罪与救赎
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@jin10086 感谢!从引用文章中找到延迟两次的原因了。
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@wangyilin1987
可以看下这篇文章,里面几个引用也一起看看,此地无人生还:区块链随机数的原罪与救赎
如果使用两次defer
开奖,随机种子除了tapos_block_num
、tapos_block_prefix
没有其他可控因子,黑客怎么攻击会呢?我看最近有个游戏就被攻击了,但没披露细节。
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