The Experts below are selected from a list of 2049 Experts worldwide ranked by ideXlab platform

Mohsen Machhout - One of the best experts on this subject based on the ideXlab platform.

  • high performance and reliable fault detection scheme for the secure hash algorithm
    Indian journal of science and technology, 2017
    Co-Authors: Fatma Kahri, Belgacem Bouallegue, Hassen Mestiri, Mohsen Machhout
    Abstract:

    Background/Objectives: Among the powerful techniques against the protected hash functions (SHA) the method of fault injection attacks. For obtain the confidential information, the method consist to inject this attacks during the process of the hash algorithm. In literature, they proposed a many methods of countermeasures to secure the SHA implementation against these attacks. Methods/Statistical Analysis: In this paper, we proposed a new scheme of fault detection; this scheme is based on the combines of two redundancies named hybrid redundancy for the hash algorithm. The weaknesses and the strengths of our proposed method against the fault attacks are discussed. Findings: our schemes proposed reaches 99.999% fault coverage. Moreover, we are implemented our proposed scheme on Xilinx Virtex-5 and Virtex-II Pro FPGA. Its area overhead fault coverage, frequency and throughput degradation have been compared and it is shown that our proposed scheme allows a trade-off between the security of the SHA and hardware overhead. Application/Improvements: Compared to other work, our fault detection scheme has the important performances in terms of frequency, occupied slices, fault coverage and throughput.

  • an efficient fault detection scheme for the secure hash algorithm sha 512
    2017 International Conference on Green Energy Conversion Systems (GECS), 2017
    Co-Authors: Fatma Kahri, Belgacem Bouallegue, Hassen Mestiri, Mohsen Machhout
    Abstract:

    To protect the implementation of the standard secure hash algorithm (SHA) against attacks. We have proposed a number of countermeasures. This paper present a proposed new fault detection scheme. It is based on the hybrid redundancy. The simulation results prove that the fault coverage achieves 99.999% for our scheme proposed. Also, our proposed detection scheme has been implemented on Xilinx Virtex-II Pro FPGA. It is fault coverage, area degradation, frequency, throughput and efficiency overhead have been compared and it is shown that the proposed scheme allows a trade-off between the security and the implementation cost of the SHA implementation.

  • a novel image encryption scheme using chaos hyper chaos systems and the secure hash algorithm sha 1
    International Conference on Control and Automation, 2017
    Co-Authors: Nabil Ben Slimane, Kais Bouallegue, Mohsen Machhout
    Abstract:

    In this paper, we introduce a fast, secure and robust scheme for digital image encryption using chaotic system of Lorenz, 4D hyper-chaotic system and the secure hash algorithm SHA-1. The encryption process consists of three layers: sub-vectors confusion and two-diffusion process. In the first layer we divide the plainimage into sub-vectors then, the position of each one is changed using the chaotic index sequence generated with chaotic attractor of Lorenz, while the diffusion layers use hyper-chaotic system to modify the values of pixels using an XOR operation. The results of security analysis such as statistical tests, differential attacks, key space, key sensitivity, entropy information and the running time are illustrated and compared to recent encryption schemes where the highest security level and speed are improved.

  • nested chaotic image encryption scheme using two diffusion process and the secure hash algorithm sha 1
    International Conference on Control Engineering & Information Technology, 2016
    Co-Authors: Nabil Ben Slimane, Kais Bouallegue, Mohsen Machhout
    Abstract:

    Security of multimedia data becomes an obligation, due the increasing use in smart embedded systems and other domains such as medical industrial and engineering applications. In this paper, we propose a fast, secure and light weight scheme for digital image encryption based on nested chaotic attractors using the secure hash algorithm SHA-1 using only two-diffusion process. The results of security analysis such as statistical tests, differential attacks, key space, key sensitivity, entropy information and the running time are illustrated and compared to recent encryption schemes where the highest security level and speed are improved.

  • ARES - A Reconfigurable Implementation of the New secure hash algorithm
    The Second International Conference on Availability Reliability and Security (ARES'07), 2007
    Co-Authors: Medien Zeghid, Belgacem Bouallegue, Adel Baganne, Mohsen Machhout, Rached Tourki
    Abstract:

    The main applications of the hash functions are met in the fields of communication's integrity and signature authentication. Many hash algorithms have been investigated and developed in the last years. This work is related to hash functions FPGA implementation. Field programmable gate arrays (FPGAs) being reconfigurable, flexible and physically secure are a natural choice for implementation of hash functions in a broad range of applications with different area-performance requirements. We propose a configurable secure hash algorithm (SHA) processor for extended signature authentication. This paper investigates different optimizations algorithms of recent techniques that have been proposed in the literature. In our implementation based on Xilinx Virtex FPGAs, the throughput of SHA processor is equal to 1296 Mbit/s. Speed/area results from these processors are analyzed and shown to compare favorably with other FPGA-based implementations. A fastest data throughput is achieved by our optimized algorithm

Y U Guohua - One of the best experts on this subject based on the ideXlab platform.

  • research of secure hash algorithm sha 1
    Computers & Security, 2010
    Co-Authors: Y U Guohua
    Abstract:

    Information encryption technology has become an important means to ensure network security and encryption algorithm has become a hotspot.This paper introduces the SHA-1 algorithm characteristic and application,analyses SHA-1 algorithm principle and implementation.

  • a secure hash algorithm for message authentication based on ipv6
    Computer Engineering, 2003
    Co-Authors: Y U Guohua
    Abstract:

    This paper presents a secure hash algorithm which can be used to design MAC for message authentication based on IPv6. The algorithm allows a hash value of 160 bits,so it greatly increases the strength of information security. The algorithm adopts two parallel flow-process mechanism and in each iterative operation uses different extension word in its implementation,which greatly increases the complexity of seeking the conflict among rounds. It is used as authentication algorithm in implementing IPSec.

Ramzi Guesmi - One of the best experts on this subject based on the ideXlab platform.

  • A new efficient medical image cipher based on hybrid chaotic map and DNA code
    Multimedia Tools and Applications, 2020
    Co-Authors: Ramzi Guesmi, M. A. B. Farah
    Abstract:

    In this paper, we propose a novel medical image encryption algorithm based on a hybrid model of deoxyribonucleic acid (DNA) masking, a secure hash algorithm SHA-2 and a new hybrid chaotic map. Our study uses DNA sequences and operations and the chaotic hybrid map to strengthen the cryptosystem. The significant advantages of this approach consist in improving the information entropy which is the most important feature of randomness, resisting against various typical attacks and getting good experimental results. The theoretical analysis and experimental results show that the algorithm improves the encoding efficiency, enhances the security of the ciphertext, has a large key space and a high key sensitivity, and is able to resist against the statistical and exhaustive attacks.

  • A novel chaos-based image encryption using DNA sequence operation and secure hash algorithm SHA-2
    Nonlinear Dynamics, 2016
    Co-Authors: Ramzi Guesmi, Abdennaceur Kachouri, M. A. B. Farah, M. Samet
    Abstract:

    In this paper, we propose a novel image encryption algorithm based on a hybrid model of deoxyribonucleic acid (DNA) masking, a secure hash algorithm SHA-2 and the Lorenz system. Our study uses DNA sequences and operations and the chaotic Lorenz system to strengthen the cryptosystem. The significant advantages of this approach are improving the information entropy which is the most important feature of randomness, resisting against various typical attacks and getting good experimental results. The theoretical analysis and experimental results show that the algorithm improves the encoding efficiency, enhances the security of the ciphertext and has a large key space and a high key sensitivity, and it is able to resist against the statistical and exhaustive attacks.

  • hash key-based image encryption using crossover operator and chaos
    Multimedia Tools and Applications, 2015
    Co-Authors: Ramzi Guesmi, Mohamed Amine Ben Farah, Abdennaceur Kachouri, Mounir Samet
    Abstract:

    This paper proposes a color image encryption scheme using one-time keys based on crossover operator, chaos and the secure hash algorithm(SHA-2). The (SHA-2) is employed to generate a 256-bit hash value from both the plain-image and the secret hash keys to make the key stream change in each encryption process. The SHA-2 value is employed to generate three initial values of the chaotic system. The permutation-diffusion process is based on the crossover operator and XOR operator, respectively. Experimental results and security analysis show that the scheme can achieve good encryption result through only one round encryption process, the key space is large enough to resist against common attacks,so the scheme is reliable to be applied in image encryption and secure communication.

Belgacem Bouallegue - One of the best experts on this subject based on the ideXlab platform.

  • high performance and reliable fault detection scheme for the secure hash algorithm
    Indian journal of science and technology, 2017
    Co-Authors: Fatma Kahri, Belgacem Bouallegue, Hassen Mestiri, Mohsen Machhout
    Abstract:

    Background/Objectives: Among the powerful techniques against the protected hash functions (SHA) the method of fault injection attacks. For obtain the confidential information, the method consist to inject this attacks during the process of the hash algorithm. In literature, they proposed a many methods of countermeasures to secure the SHA implementation against these attacks. Methods/Statistical Analysis: In this paper, we proposed a new scheme of fault detection; this scheme is based on the combines of two redundancies named hybrid redundancy for the hash algorithm. The weaknesses and the strengths of our proposed method against the fault attacks are discussed. Findings: our schemes proposed reaches 99.999% fault coverage. Moreover, we are implemented our proposed scheme on Xilinx Virtex-5 and Virtex-II Pro FPGA. Its area overhead fault coverage, frequency and throughput degradation have been compared and it is shown that our proposed scheme allows a trade-off between the security of the SHA and hardware overhead. Application/Improvements: Compared to other work, our fault detection scheme has the important performances in terms of frequency, occupied slices, fault coverage and throughput.

  • an efficient fault detection scheme for the secure hash algorithm sha 512
    2017 International Conference on Green Energy Conversion Systems (GECS), 2017
    Co-Authors: Fatma Kahri, Belgacem Bouallegue, Hassen Mestiri, Mohsen Machhout
    Abstract:

    To protect the implementation of the standard secure hash algorithm (SHA) against attacks. We have proposed a number of countermeasures. This paper present a proposed new fault detection scheme. It is based on the hybrid redundancy. The simulation results prove that the fault coverage achieves 99.999% for our scheme proposed. Also, our proposed detection scheme has been implemented on Xilinx Virtex-II Pro FPGA. It is fault coverage, area degradation, frequency, throughput and efficiency overhead have been compared and it is shown that the proposed scheme allows a trade-off between the security and the implementation cost of the SHA implementation.

  • ARES - A Reconfigurable Implementation of the New secure hash algorithm
    The Second International Conference on Availability Reliability and Security (ARES'07), 2007
    Co-Authors: Medien Zeghid, Belgacem Bouallegue, Adel Baganne, Mohsen Machhout, Rached Tourki
    Abstract:

    The main applications of the hash functions are met in the fields of communication's integrity and signature authentication. Many hash algorithms have been investigated and developed in the last years. This work is related to hash functions FPGA implementation. Field programmable gate arrays (FPGAs) being reconfigurable, flexible and physically secure are a natural choice for implementation of hash functions in a broad range of applications with different area-performance requirements. We propose a configurable secure hash algorithm (SHA) processor for extended signature authentication. This paper investigates different optimizations algorithms of recent techniques that have been proposed in the literature. In our implementation based on Xilinx Virtex FPGAs, the throughput of SHA processor is equal to 1296 Mbit/s. Speed/area results from these processors are analyzed and shown to compare favorably with other FPGA-based implementations. A fastest data throughput is achieved by our optimized algorithm

  • a reconfigurable implementation of the new secure hash algorithm
    Availability Reliability and Security, 2007
    Co-Authors: Medien Zeghid, Belgacem Bouallegue, Adel Baganne, Mohsen Machhout, Rached Tourki
    Abstract:

    The main applications of the hash functions are met in the fields of communication's integrity and signature authentication. Many hash algorithms have been investigated and developed in the last years. This work is related to hash functions FPGA implementation. Field programmable gate arrays (FPGAs) being reconfigurable, flexible and physically secure are a natural choice for implementation of hash functions in a broad range of applications with different area-performance requirements. We propose a configurable secure hash algorithm (SHA) processor for extended signature authentication. This paper investigates different optimizations algorithms of recent techniques that have been proposed in the literature. In our implementation based on Xilinx Virtex FPGAs, the throughput of SHA processor is equal to 1296 Mbit/s. Speed/area results from these processors are analyzed and shown to compare favorably with other FPGA-based implementations. A fastest data throughput is achieved by our optimized algorithm

M. Samet - One of the best experts on this subject based on the ideXlab platform.

  • A novel chaos-based image encryption using DNA sequence operation and secure hash algorithm SHA-2
    Nonlinear Dynamics, 2016
    Co-Authors: Ramzi Guesmi, Abdennaceur Kachouri, M. A. B. Farah, M. Samet
    Abstract:

    In this paper, we propose a novel image encryption algorithm based on a hybrid model of deoxyribonucleic acid (DNA) masking, a secure hash algorithm SHA-2 and the Lorenz system. Our study uses DNA sequences and operations and the chaotic Lorenz system to strengthen the cryptosystem. The significant advantages of this approach are improving the information entropy which is the most important feature of randomness, resisting against various typical attacks and getting good experimental results. The theoretical analysis and experimental results show that the algorithm improves the encoding efficiency, enhances the security of the ciphertext and has a large key space and a high key sensitivity, and it is able to resist against the statistical and exhaustive attacks.