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Subject: search.filters.subject.Cryptography

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    Realization of image cryptography using FPAA-based two chaotic systems
    (2023-01-01)
    Sanprang, Pitipat
    ;
    Amornsusawad, Chinnapat
    ;
    Boonmak, Kuntapong
    ;
    Chimnoy, Jirat
    ;
    Karawanich, Khunanon
    This paper presents a data cryptography system based on chaotic systems (Lorenz and jerk). The system implementation consists of Field Programmable Analog Array (FPAA) and a microcontroller for transmit and receiver sides. MATLAB/Simulink provides the simulation results in various parameters. The experimental setup is exhibited by applying the data of digital pictures, which are encrypted by the selected chaos model and transmitted by using the serial port. The receiver can be correctly decrypted if and only if the chosen chaos model and parameters are perfectly matched with the transmitter. The experimental results of BER were measured around $42.39\times 10^{-6}$ for the Lorenz system and $38.29\times 10^{-6}$ for the jerk system with a time of approximately 24 minutes to recover all 10,002,432 bits
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    A four-scroll chaotic generator based on two nonlinear functions and its telecommunications cryptography application
    (2022-12-01)
    Karawanich, Khunanon
    ;
    Kumngern, Montree
    ;
    Chimnoy, Jirat
    ;
    Prommee, Pipat
    This paper describes a new chaotic jerk system based on two different nonlinear functions. The modified signum and rectangular functions are incorporated into the system at different positions. The system can generate double-scroll and new four-scroll chaotic attractors by adjusting only one coefficient (k). The chaotic behaviors of the proposed system are investigated by the Lyapunov spectrum and period distribution of state variable × of the bifurcations. The complexity of the proposed chaotic system is computed by the Kaplan-Yorke dimension of 2.30. The coexisting attractors and basin of attraction are also included to verify the system's dynamic to the initial conditions. The PCB prototype's commercially available OPAMP and passive components are realized to confirm the numerical studies. The experimental results and the numerical results are agreeable in signals and attractors. The chaotic masking method is applied for encrypting the data for secure communication. The efficient encrypted signal can be obtained, and the decrypted data can be correctly received after successful synchronization.
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    A single, triple chaotic cryptography using chaos in digital filter and its own comparison to des and triple des
    (2018-05-30)
    Pich, Reatrey
    ;
    Chivapreecha, Sorawat
    ;
    Prabnasak, Jaruwit
    The Data Encryption Standard (DES) of the multimedia cryptography possesses the weak point of key conducting that is why it reaches to the triple form of DES. However, the triple DES obtains the better characteristic to secure the protection of data to against the attacks, it still contains an extremely inappropriate performance (speed) and efficiency in doing so. This paper provides the effective performance and the results of a single and triple chaotic cryptography using chaos in digital filter, compare to DES and triple DES. This comparison has been made pair-to-pair of single structure respectively to the triple form. Finally the implementation aspects of a single chaotic cryptography using chaos in digital filter can stand efficiently as better performance speed with the small complexity algorithm, points out the resemblances to DES and triple DES with the similar security confirmation results without reaching to the triple form of the structure. Simulation has been conducted using Matlab simulation with the input of grayscale image.
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    A new key generator for data encryption using chaos in digital filter
    (2017-10-17)
    Pich, Reatrey
    ;
    Chivapreecha, Sorawat
    ;
    Prabnasak, Jaruwit
    The presented work of this paper is to propose the implementation of chaotic crypto-system with the new key generator using chaos in digital filter for data encryption and decryption. The chaos in digital filter of the second order system is produced by the coefficients which are initialed in the key generator to produce other new coefficients. Private key system using the initial coefficients value condition and dynamic input as password of 16 characters is to generate the coefficients for crypto-system. In addition, we have tension specifically to propose the solution of data security in lightweight cryptography based on external and internal key in which conducts with the appropriate key sensitivity plus high performance. The chaos in digital filter has functioned as the main major in the system. The experimental results illustrate that the proposed data encryption with new key generator system is the high sensitive system with accuracy key test 99% and can make data more secure with high performance.