IEEE 802．11i标准增强了WLAN的安全性，下面关于802．11i的描述中，错误的是()。
- A.加密算法采用高级数据加密标准AES
- B.加密算法采用对等保密协议WEP
- C.用802.1x实现了访问控制
- D.使用TKIP协议实现了动态的加密过程
正确答案及解析
正确答案
解析
IEEE 802．11i工作组致力于制订被称为IEEE 802．11i的新一代安全标准，这种安全标准为了增强WLAN的数据加密和认证性能，定义了RSN(Robust Security Network)的概念，并且针对WEP加密机制的各种缺陷做了多方面的改进。IEEE 802．11i规定使用802．1x认证实现了访问控制和密钥管理方式，在数据加密方面，定义了TKIP(TemporalKey Integrity Protocol)、CCMP(Counter-Mode／CBC-MACProtocol)和WRAP(Wireless Robust Authenticated Protocol)三种加密机制。其中TXJP采用WEP机制里的RC4作为核心加密算法，可以通过在现有的设备上升级固件和驱动程序的方法达到提高WLAN安全的目的。CCMP机制基于AES(Advanced Encryption Standard)加密算法和CCM(Counter-Mode／CBC—MAC)认证方式，使得WLAN的安全程度大大提高，是实现RSN的强制性要求。由于AES对硬件要求比较高，因此CCMP无法通过在现有设备的基础上进行升级实现。WRAP机制基于AES加密算法和OCB(Offset Code Book)，是一种可选的加密机制。
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