Security enhancement for OFDM-UWOC system using three-layer chaotic encryption and chaotic DFT precoding

Huan Deng; Zihao Du; Jianmin Xiong; Xingqi Yang; Yan Hua; Jing Xu

doi:10.3788/COL202220.110601

Journals >Chinese Optics Letters >Volume 20 >Issue 11 >Page 110601 > Article

Chinese Optics Letters
Vol. 20, Issue 11, 110601 (2022)

Security enhancement for OFDM-UWOC system using three-layer chaotic encryption and chaotic DFT precoding | Editors' Pick

Huan Deng¹, Zihao Du¹, Jianmin Xiong¹, Xingqi Yang¹, Yan Hua¹, and Jing Xu^1、2、*

Author Affiliations

¹Optical Communications Laboratory, Ocean College, Zhejiang University, Zhoushan 316021, China

²Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province, Ocean College, Zhejiang University, Zhoushan 316021, China

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DOI: 10.3788/COL202220.110601 Cite this Article Set citation alerts

Huan Deng, Zihao Du, Jianmin Xiong, Xingqi Yang, Yan Hua, Jing Xu. Security enhancement for OFDM-UWOC system using three-layer chaotic encryption and chaotic DFT precoding[J]. Chinese Optics Letters, 2022, 20(11): 110601 Copy Citation Text

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Fig. 1. Block diagram of the secure OFDM-UWOC based on three-layer chaotic encryption and chaotic DFT precoding.

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Fig. 2. Schematic diagram of time-frequency scrambling^[21].

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Fig. 3. Experimental setup. Insets: (a) the transmitter module, (b) the water tank, and (c) the receiving module.

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Fig. 4. Performance of PAPR for (a) original image data and (b) three-layer encrypted data under different conditions.

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Fig. 5. BER curves of normal and illegal receiver for (a) original image data and (b) three-layer encrypted data.

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Fig. 6. (a) Change 1 bit in plaintexts. (b) The difference of ciphertext change on the first 60 OFDM subcarriers.

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	Our Scheme	Ref. [20] (with DFT-S)	Ref. [18]
Real-valued multiplication	0	N²	0
Complex-valued multiplication	M² + N²	M²	M² + N²
Addition	M(M − 1) + N(N − 1)	3M(M − 1) + 2M × (2M − 1) + N(N − 1)	M(M − 1) + N(N − 1)

Table 1. The Computation Complexity of Encryption Schemes

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	Our Chaotic Systems	7D Chaos (Ref. [20])	Chaos Maps (Ref. [18])
Addition	104	221	5
Multiplication	110	118	10
Sine function	0	4	2

Table 2. The Computation Complexity of Chaos Systems

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OFDM Parameters	Values
Modulation format	16-QAM
Number of effective subcarriers	256
Inverse fast Fourier transform (IFFT) size	1024
Number of cyclic prefix (CP)	64
Number of subcarriers for gap near DC	8
Number of OFDM symbols	520