An awgn-wiretap channel anti-eavesdropping security structure based on polar codes and its implementation method

Abstract

The invention discloses an AWGN-wiretap channel anti-wiretapping security structure based on polar code and an implementation method thereof, belonging to the field of communication. The anti-wiretapping security structure includes a sending end confusing structure and a legal receiving end de-confusing structure; the sending end confusing structure includes a sequential exclusive or (XOR) device, a confusion interleaver and a nonlinear searching table S-box; and the legal receiving end de-confusing structure includes a sequential XOR device, a de-confusing interleaver and a reverse S-box. The de-confusing structure is symmetric with the confusing structure. The de-confusing structure and the confusing structure can be completed in the same set of hardware, so that the composition of the anti-wiretapping security structure is simpler. The sequential XOR device and the confusion interleaver are of linear confusion structures, but the S-box is of a nonlinear confusion structure. The nonlinear confusion structure can reduce the correlation between input and output, and can resist differential fault attacks effectively, but the linear confusion structure is helpful for error bit spread of a single-bit code unit, therefore, it is difficult for an eavesdropper to obtain any information by means of violent enumeration or analysis of differential probability of signals.

Description

technical field [0001] The invention belongs to the communication field, and in particular relates to an AWGN-wiretap channel anti-eavesdropping security structure based on polar codes and an implementation method thereof. Background technique [0002] At present, most of the confidential communication systems of wireless communication are based on the assumption of no bit error rate transmission at the physical layer. However, in wireless networks, due to a series of influences such as channel fading and noise, the bit error rate of the physical layer cannot be ignored. The ciphertext is not necessarily consistent with the sender, and the transmission error of the ciphertext can lead to the failure of decryption, so the design of the error correction code at the physical layer is of great significance to the security system of wireless communication. [0003] In addition, because the information of the wireless channel is loaded on the communication carrier and spreads free...

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Problems solved by technology

[0002] At present, most of the confidential communication systems of wireless communication are based on the assumption of no bit error rate transmission at the physical layer. However, in wireless networks, due to a series of influences such as channel fading and noise, the bit error rate of the physical layer cannot be ignored. The ciphertext is not necessarily consistent with the sender, and the transmission error of the ciphertext can lead to the failure of decryption, so the design of the error correction code at the physical layer is of great significance to the security system of wireless communication

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