An improved chaos-based secure communication technique using a novel encryption function with an embedded cipher key

Computational Intelligence in Control and Automation (CICA)

Abu-Rezq

2011

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This paper discusses the topic of using chaotic models for constructing secure communication systems. It investigates two different case studies that use encryption/decryption functions with varying degrees of complexity and performance. The first case study explores the use of an improved cryptography method for scrambling the transmitted signal. The improvement is based on using both the transmitter states and parameters for performing the encryption. The second case study augments a parameter update law to the previous design such that the encryption method is more robust. It uses a decoupling technique for which the synchronization process is completely isolated from the parameter identification algorithm. The effect of using a noisy public channel is investigated. The security of the proposed methods and their advantages and limitation are analyzed using intruder return map attacks to the communication channel. The Lorenz system was used to exemplify the suggested techniques, while transmitting a digital signal. The paper ends with a discussion that investigates various techniques to optimize the performance of the proposed systems.

“…(11), and the result, outlined in Eq. (12) completes the design of the modified secure communication system.…”

Section: Design Of the Parameter Update Lawmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 96%

Noise considerations and cryptanalysis of chaos-based secure communication systems

Computational Intelligence in Control and Automation (CICA)

Abu-Rezq

2011

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“…This is due to the fact that chaotic dynamics, given by both autonomous and nonautonomous systems, are still deterministic, and with the proper use of control techniques, transmitters and receivers can be synchronized, despite their critical dependency on initial conditions [16].…”

Section: A Secure Communication Case Studymentioning

confidence: 99%

Secure communication using Duffing oscillators

2011 IEEE International Conference on Signal and Image Processing Applications (ICSIPA)

2011

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In this paper, a Duffing oscillator is used to construct a chaos-based secure communication system for transmitting digital signals. The synchronization of both the transmitter and the receiver is carried out using a Lyapunov-based control approach that observes the states of the transmitter. The parameters of the transmitter are assumed unknown, and are estimated at the receiver side to accomplish two tasks. The first one is to complete the synchronization process, while the second one is to implement a cryptography approach to secure the transmitted message. Different difficulty levels of constructing both the state observer and/or the parameters update laws are investigated, while highlighting the coupling effects between them. Tuning the proposed system, along with meeting hardware constraints when transmitting real-time signals are addressed, and recommendations for improving the performance are discussed. I. INTRODUCTIONRecently, and since the pioneer work of chaos synchronization [1], chaos-based secure communication systems have evolved in plenty of forms using different techniques to achieve synchronization between the transmitter and the receiver [2], while identifying the unknown parameters of the transmitter. Additive masking, chaos shift keying, chaotic switching, and chaotic modulation are among the most famous techniques in the field of secure communication [3]-[8].In the last decade, further research was carried out to improve the security level of chaotic secure communication systems via utilizing chaotic cryptosystems [9]. In these systems nonlinear encryption methods are used to scramble the secure message at the transmitter side, while using an inverse operation at the receiver side that can effectively recover the original message, provided that synchronization is achieved. The degree of complexity of the encryption function and the insertion of ciphers (secret keys) led to having more robust techniques with both analog and digital communication [10].Synchronizing both the chaotic transmitter and receiver is a bottleneck in designing chaotic secure communication systems as, by default, chaotic systems defy synchronization [11] due to their inherent sensitivity to initial conditions. Never the less, synchronization for two identical, possibly chaotic, dynamical systems can be achieved such that the solution of one always converges to the solution of the other independently of initial conditions using a drive-response mechanism, where there is an interaction between one system and the other, but not vice versa. This drive-response coupling can be used to generate estimates of the states of the drive system when both systems to be synchronized have a similar structure. This kind of identical synchronization can be achieved provided that all real parts of the Lyapunov exponents of the response system, under the influence of the driver, are negative.

“…This made it very suitable for transmitting digital signal, where the secret message corresponds to either of its two binary states [7]. Implementation CSK systems proved to be efficient, either in analog or digital hardware, as reconstructing the secret message can be done using a two-stage process consisting of low-pass filtering followed by thresholding [8].…”

Section: Introductionmentioning

confidence: 99%

“…Starting from the early work in [10], other forms of CSK were developed using both continuous and discrete systems. DCSK, BPSK, QPSK, and QCSK are variants of the classical CSK method that are developed with the aim of having better noise rejection and increased data transmission rates [11], or improved security public communication channels that are vulnerable to attacks from intruders [1,3,7,9].…”

Section: Introductionmentioning

confidence: 99%

A cryptography algorithm for transmitting multimedia data using quadruple-state CSK

2015 International Conference on Computer, Communications, and Control Technology (I4CT)

2015

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A new technique for secure communication is introduced that aims at robustifying classical Chaotic Shift Keying (CSK) methods. The secret data are hidden within the chaotic transmitter states that can change among four different chaotic attractors such that binary information is effectively diffused. A novel cryptography algorithm is used to change the transmitter parameters such that they have a quadruple form; thus, breaking into the public communication channel using return map attacks will fail. At the receiver side, an adaptive control method is used to estimate the time-varying transmitter parameters via adopting a complete synchronization approach. Simulation results demonstrate the superior performance of the proposed technique in both time and frequency domains. A Duffing oscillator is used to build the proposed system using only the time series for the output. Different implementation issues are investigated for various digital multimedia data and an experimental investigation is carried out to verify the effectiveness of the proposed technique. Finally, generalizations to other chaotic systems as well as real-time compatibility of the design are discussed.