Abstract
In this paper, a multilayer dynamic encryption scheme using deoxyribonucleic acid reconstructed chaotic sequences (DNA-RCS) under cryptanalysis is firstly proposed, which aims at enhancing the security of orthogonal frequency division multiplexing passive optical network (OFDM-PON). We adopt DNA coding to reconstruct chaotic sequences, the selected coding rules and the number of chaotic sequence blocks divided are then random, the randomness and security of encryption sequences are improved. The transmitted signal is encrypted in two layers. The first layer is hybrid chaotic permutation and diffusion. Each symbol can be encrypted by the combination of a single non-repetitive permutation and plaintext-related diffusion. It makes encryption not only depend on the chaotic sequences but also relate to the order of permutation. The second layer is a dynamic Josephus permutation. By taking the unit as the permutation object, the scrambling efficiency is increased. Also, the counting period is randomly selected, which can enhance the security of the system. The number of tests needed to break a secure transmission for an attacker can reach up to $3.096\times 10^{106}$ . An encryption signal with 22.06Gb/s is successfully demonstrated over a 25-km standard single-mode fiber (SSMF) and a back-to-back (BTB) system. It is proved that the proposed scheme does not degrade the system performance and can effectively resist various attacks by the performance analysis model based on cryptanalysis.
Highlights
Orthogonal frequency division multiplexing passive optical network (OFDM-PON), as the optimal scheme for next-generation access network, can provide users with large bandwidth and low-cost services due to its advantages such as flexible resource allocation, high spectrum efficiency, and strong robustness against fiber dispersion [1], [2]
Dynamic codebooks are generated using the randomness of chaotic keys and input data to achieve chaotic permutation and polarity reversal of subcarriers [33], but it is only proved by Monte Carlo simulation that it can resist known plaintext attacks (KPAs) and CPAs
For the chaotic system and permutation mechanism adopted by the encryption schemes, the effect verification includes two aspects: security performance and communication performance
Summary
Orthogonal frequency division multiplexing passive optical network (OFDM-PON), as the optimal scheme for next-generation access network, can provide users with large bandwidth and low-cost services due to its advantages such as flexible resource allocation, high spectrum efficiency, and strong robustness against fiber dispersion [1], [2]. A security enhancement scheme combining improved DNA coding at the bit-level and matrix scrambling at the symbol-level is proposed to obtain a larger key space and ensure the security of the physical layer [22]. A cyclic XOR operation is performed to generate nonlinear transformation bit data by the S-boxes This scheme can improve resistance to CPAs. Dynamic codebooks are generated using the randomness of chaotic keys and input data to achieve chaotic permutation and polarity reversal of subcarriers [33], but it is only proved by Monte Carlo simulation that it can resist known plaintext attacks (KPAs) and CPAs. it is necessary to evaluate the provable security of physical layer encryption schemes in OFDM-PON under cryptanalysis. A multilayer dynamic encryption scheme for security OFDM-PON using DNA-reconstructed chaotic sequences (DNA-RCS) under cryptanalysis is proposed. Is obtained by splicing the transformed chaotic sequence blocks according to the order of divided blocks
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