修正鱼人攻击计时问题。
为了防御计时攻击，一般采用以“绑定法”为代表，影响运算性能的模幂算法。
The most widely accepted defense against timing attacks is to perform RSA blinding, which has a performance penalty.
增加“被伤害”摧毁计时器，当每次你受到攻击，需要再等待20秒才可以摧毁物品。
Added a "damaged" destroy timer. Each time you get hit you need to wait 20 seconds before you can destroy anything.
针对此问题，提出同底构造攻击的概念，并明确指出，在进行数字签名设计时，必须回避这种现象。
The paper proposed a new concept: the attack based on identical base construction, and explicitly indicated that defects could be avoided in designing digital signature.
针对此问题，提出同底构造攻击的概念，并明确指出，在进行数字签名设计时，必须回避这种现象。
The paper proposed a new concept: the attack based on identical base construction, and explicitly indicated that defects could be avoided in designing digital signature.
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