• 1. active attacks: 活动攻击 | 主动式攻击

• 1.Users may select encryption without specifying authentication, but this action leaves the packets vulnerable to active attacks, which can lead to an outside entity breaking the encryption.
  用户可以选择不用特定的认证进行加密，但是这样会让包容易受到攻击，导致让别人破坏加密。
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• 2.Although compared with the previous, improved their safety, but when faced with security attacks (passive attacks and active attacks), the whole network system security still needs to be improved.
  虽然与之前相比，其安全性有所提高，但当面临安全攻击(被动攻击和主动攻击)时，整个网络系统的安全性仍然亟待提高。
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• 3.Availability is assured at the operating system level, allowing for transparent mitigation of active and passive network denial-of-service attacks.
  它在操作系统级确保可用性，可以透明地缓解主动和被动网络拒绝服务攻击。
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