尽管采取一两项关键措施预防SQL Injection攻击是很容易的，但最好是对问题采用分层方法。

While it's easy to point to one or two key measures for the prevention of the SQL injection attack, it's best to take a layered approach to the problem.

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针对分层组播协议存在的自利型攻击问题，提出了一种安全分层组播协议，设计了基于拥塞状态的访问控制算法。

Aiming at the self-beneficial attack problem in layered multicast protocol, a secure layered multicast protocol is presented. The congestion state related access control algorithm is designed.

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