Physical layer encryption scheme using finite-length polar codes
Physical layer encryption scheme using finite-length polar codes
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DOI：
10.1049/iet-com.2014.0933
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发表时间：
2015-10-15
影响因子：
1.6
通讯作者：
Eghlidos, Taraneh
中科院分区：
文献类型：
--
作者：
Hooshmand, Reza;Aref, Mohammad Reza;Eghlidos, Taraneh
在这项研究中，通过利用有限长度极化码的特性，作者引入了一种物理层加密方案，以使发送方（Alice）和合法接收方（Bob）之间的通信安全（从计算安全的角度来看）和有效，同时抵御主动和被动攻击。为了防止主动攻击，提出了两种技术：（i）提出了一种新的方法来保护极化码的生成矩阵不被主动攻击者（Oscar）发现;（ii）提出了一种基于隐生成矩阵的联合极化编码/加密算法。针对被动攻击，提出了两种新的策略：（1）将比特信道划分为好的比特信道和坏的比特信道，然后在对Bob有利而对被动攻击者（Eve）不利的比特信道上传输加扰信息比特;（ii）在物理层实现秘密密钥加密，使得Eve在不知道在授权方之间共享的秘密密钥的情况下不能解码被窃听的数据。此外，本研究讨论了效率分析结果，包括密钥大小，错误性能和计算复杂度的建议方案。
In this study, by exploiting the properties of finite-length polar codes, the authors introduce a physical layer encryption scheme to make secure (from a computational security perspective) and efficient communication between a sender (Alice) and a legitimate receiver (Bob) against both active and passive attacks, simultaneously. To prevent active attacks, two techniques are considered: (i) a novel method is introduced to keep the generator matrix of polar code secret from an active attacker (Oscar); (ii) a proper joint polar encoding/encryption algorithm based on the hidden generator matrix is introduced. Two additional strategies are considered against passive attacks: (i) a new method is introduced to partition the bit-channels into good and bad bit-channels and then the scrambled information bits are transmitted over those bit-channels that are good for Bob but bad for a passive attacker (Eve); (ii) the secret key cryptography is implemented at the physical layer, such that Eve cannot decode the eavesdropped data without the knowledge of the secret key shared between the authorised parties. Besides, this study discusses efficiency analysis results consisting key size, error performance and computational complexity of the proposed scheme.