Secure Interleaving - Physical Layer Security Enhancement of OFDM Based System
Secure Interleaving - Physical Layer Security Enhancement of OFDM Based System
复制标题
安全交织 - 基于 OFDM 系统的物理层安全增强
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
Rana Shahid Manzoor
中科院分区：
文献类型：
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作者：
M. A. Khan;V. Jeoti;Rana Shahid Manzoor
交织器通常用于分配突发差错，因此它们表现为简单的随机差错。或者，如果交织图案保持安全，则这些图案可以作为物理层安全设备引入。本文提出了一种在物理层引入安全性的有效技术来增强802.11i的安全性，旨在提高媒体访问控制的安全性。由于它不强调可用性，因此可能会发生几种拒绝服务(DoS)攻击。DoS攻击很容易发动，因为管理和控制帧不受保护，MAC报头也是如此。本文提出了一种基于种子的安全随机交织技术，对OFDM星座符号进行置乱，对数据传输进行加密，以抵抗这些恶意攻击。为了分析该技术作为物理层安全设备的适用性，进行了密钥敏感度分析。使用适当的密钥，加扰是完全可逆的。然而，即使在第四个小数点使用错误的初始条件，也会产生完全不同的序列，从而以相等的概率产生错误的星座。为了分析该技术的有效性，对各种安全攻击进行了详细的分析。
Interleavers are typically used to distribute burst of errors, so they appear as simple random errors. Alternatively, if interleaving patterns are kept secure, then these patterns can be introduced as a physical (PHY) layer security device. In this paper, an efficient technique to introduce security at physical (PHY) layer is proposed to enhance the security of 802.11i, which is designed to improve the security at medium access control. Since it does not emphasize on availability therefore several denial of service (DoS) attacks are possible. The DoS attacks are easy to mount because management and control frames are unprotected and so are MAC headers. This paper proposes a secure seed based random interleaving technique to scramble the OFDM constellation symbols to encrypt data transmission to resist these malicious attacks. In order to analyze the suitability of proposed technique as PHY layer security device keysensitivity analysis is carried out. The scrambling is completely reversible with the use of appropriate key. However, use of a wrong initial condition even at 4th decimal point produces entirely different sequence resulting in erroneous constellations with equal probability. To analyze the effectiveness of proposed technique various security attacks are analyzed in detail.