Esam Hagras - Academia.edu (original) (raw)

Papers by Esam Hagras

2011 28th National Radio Science Conference (NRSC), 2011

... 165-179, 1997. [II] Elsayed Mohamed and Hassan ... [15] Esam A. Hagras, Hazem H. Aly,and Doaa... more ... 165-179, 1997. [II] Elsayed Mohamed and Hassan ... [15] Esam A. Hagras, Hazem H. Aly,and Doaa EI-Saied "An Efficient Key Management Scheme based on Elliptic Curve Signcryption for Heterogeneous Wireless Sensor Networks". UCST Vol. I, Issue 2, December 20 I O.

$Research paper thumbnail of Dynamic fractional chaotic biometric isomorphic elliptic curve for partial image encryption$

Computer Science and Information Systems, 2021

In this paper, a Modular Fractional Chaotic Sine Map (MFC-SM) has been introduced to achieve high... more In this paper, a Modular Fractional Chaotic Sine Map (MFC-SM) has been introduced to achieve high Lyapunov exponent values and completely chaotic behavior of the bifurcation diagram for high level security. The proposed MFC-SM is compared with the conventional non MFC-SM and it has an excellent chaotic analysis. In addition, the randomness test results indicate that the proposed MFC-SM shows better performance and satisfy all randomness tests. Due to the excellent chaotic properties and good randomization results for the proposed MFC-SM, it is used to be cooperated with the biometric digital identity to achieve dynamic chaotic biometric digital identity. Also, for real time image encryption, both Discrete Wavelet Transform (DWT)partial image encryption and Isomorphic Elliptic Curve (IEC)key exchange are used. In addition, the biometric digital identity is extracted from the user fingerprint image as fingerprint minutia data incorporated with the proposed MFC-SM and hence, a new Dyna...

2017 34th National Radio Science Conference (NRSC), 2017

SC-FDMA suffers from high Peak-to-Average Power Ratio (PAPR) problem, which restricts its usage i... more SC-FDMA suffers from high Peak-to-Average Power Ratio (PAPR) problem, which restricts its usage in some applications. In this paper, a joint Discrete Cosine Transform (DCT) and hyperbolic tangent companding (HTC) technique has been studied in order to minimize the effects of the peak-to-average power ratio of the SC-FDMA System. The proposed scheme utilizes a DCT rather than the conventional discrete Fourier transform (DFT) as a basis function to implement the single-carrier system. Simulation results show that the new proposed scheme reduces PAPR by about 4.2 dB and 2.6 dB companding respectively with the DCT SC-FDMA without commanding and DFT SC-FDMA with HTC at the same companding parameter. Also, it can be observed that proposed scheme provides a significant BER performance improvement over the DFT SC-FDMA with HTC by about 1.1dB. Simulation results show that, proposed scheme with HTC has the lowest BER degradation, followed by μ-law companding and A law companding by about 1.1dB, 3.1dB and 3.8dB respectively when compared with the original DCT SC-FDMA system without PAPR reduction.

2018 35th National Radio Science Conference (NRSC), 2018

In this paper, a Polar code is merged with Interleave Division Multiple Access-Ultra Wide Band (I... more In this paper, a Polar code is merged with Interleave Division Multiple Access-Ultra Wide Band (IDMA-UWB) to build a Polar-coded-IDMA-UWB communication system. For a multiuser UWB indoor environment, the performance is mainly limited by multipath fading and interferences as Multiple Access Interference (MAI) which is poorly approximated by a Gaussian distribution due to its impulsive nature. The main contribution of this paper is to study the effect of applying the newly coding technique, polar code, on IDMA-UWB system in terms of BER performance and complexity with good approximation for the interferences by using three different models as, Symmetric Alpha Stable (SαS), Laplace and Gaussian Mixture Model (GMM). Moreover, a comparative analysis is held between the proposed system and Low Density Parity Check (LDPC)-coded-IDMA-UWB system under the studied noise models. The results indicate that the proposed system is robust against noise and interferences with complexity much lower than LDPC-coded system.

In this paper, multi-user communication scenario for Ultra Wide Band (UWB) system has been consid... more In this paper, multi-user communication scenario for Ultra Wide Band (UWB) system has been considered. For effective use of spectrum in multi-user communication, a new variant of CDMA scheme known as Interleave-Division MultipleAccess (IDMA) scheme has been proposed. IDMA inherits many advantages from CDMA such as diversity against fading, mitigation of the interference among users efficiently. This paper investigates the effectiveness of IDMA scheme for multi-user detection in UWB indoor environment subjected to non-Gaussian noise. Two different non-Gaussian noise models, Laplacian and Gaussian Mixture Model (GMM), have been studied which are more realistic models for UWB systems. Simulations are performed using UWB channel model proposed by IEEE 802.15.3a working group. The performance of the proposed IDMA-UWB scheme under non-Gaussian noise models have been evaluated and compared with its performance under AWGN model. The results show that the IDMA-UWB scheme outperforms well und...

In this paper, we consider the bit error rate performance analysis of a cooperative relay communi... more In this paper, we consider the bit error rate performance analysis of a cooperative relay communication system on Multi-Layer Interleave Division Multiple Access (ML-IDMA) using Maximal-Ratio-Combining technique; we examine the effect of layers number on the performance and derive the average bit error probability of the Amplify-andForward (AF) and Decode-and-Forward (DF) relay schemes by using the closed-form relay link Signal-to-Noise Ratio and compare between these relaying protocols. Based on the analysis, and simulation results, it is shown that although degradation in the performance is observed in both relay schemes when increasing number of layers but on the other hand we saved in the band width. Slightly performance enhancing is obtained when using DF compared to AF relaying protocol. (Abstract) Keywords—cooperative transmission, multi layers, MRC, AF, DF (Key Words)

One of the most attractive candidate waveforms used in 5G systems is based the orthogonal frequen... more One of the most attractive candidate waveforms used in 5G systems is based the orthogonal frequency division multiplexing (OFDM) technology for its robustness against frequency selective fading and its high spectral efficiency. However, it suffers from high peak-to-average power ratio (PAPR) drawback. The partial transmit sequence (PTS) approach is used for reducing the PAPR of the wavelet-OFDM (WOFDM) system without signal distortion. In this paper, a modified PAPR reduction approach using a PTS-WOFDM based on genetic algorithm (GA) is proposed. The simulation results show that the proposed system provides PAPR reduction gain of 0.11 dB and 0.46 dB compared to optimum PTS-OFDM and PTS-OFDM based GA systems respectively. Also, the search complexity of the proposed GA based PTS-WOFDM system is significantly reduced by 97.25% compared to the optimum PTS-OFDM.

This paper is concerned with the design of a wireless data transmission which provides Un-equal E... more This paper is concerned with the design of a wireless data transmission which provides Un-equal Error Protection (UEP). A Multi Stream Superposition Multi Rate Coded Modulation (MS-SMRCM) system has been introduced. In the proposed MS-SMRCM, each user data bit stream can be divided into two bit streams. The first bit stream represents the region of high priority, while the second represents the region of low priority. These two bit streams are encoded, spread and interleaved separately. The resultant chip interleaved sequences are modulated and superimposed together to achieve UEP at the receiver side. A simple Chip-By-Chip (CBC) iterative Multi User Detection (MUD) strategy is used. In AWGN channel, the proposed MS-SMRCM in case of eight users input, the performance of single user is better than eight users by 2.2 dB at BER = 10−4. The performance is investigated over AWGN and Rayleigf fading channels in the presence of High Power Amplifier (HPA).

In this paper, an efficient Forward Secure Elliptic Curve Signcryption Key Management (FS-ECSKM) ... more In this paper, an efficient Forward Secure Elliptic Curve Signcryption Key Management (FS-ECSKM) Scheme for Heterogeneous Wireless Sensor Networks (HWSN) has been proposed. The proposed protocol is optimized for cluster sensor networks and is efficient in terms of complexity, number of message exchange, computation, and storage requirements with optimized security benefits for clustered environment. In addition to the message confidentiality,authentication, unforgeability and non repudiation, the proposed scheme achieves forward secrecy, public verification, and encrypted message authentication. The performance evaluation shows that this scheme can provide also extra saving in storage space compared with other previous schemes.

International Journal of Future Computer and Communication, 2013

Physics and Simulation of Optoelectronic Devices XXVII, 2019

Micro-structured fiber (MF) devices such as polarization rotators, polarization filters, and pola... more Micro-structured fiber (MF) devices such as polarization rotators, polarization filters, and polarization splitters have been widely used in optical communication systems. The concept of multifunctional photonic device becomes a new trend in optical systems. Therefore, it is essential to propose a new and compact multifunctional MF widely known as photonic crystal fiber (PCF) devices. In this paper, a compact polarization splitter that operates at two telecommunication wavelengths (1.31 μm or 1.55 μm) is designed. The proposed splitter is based on plasmonic tellurite dual core PCF in order to split the x and y polarization modes at wavelengths of 1.31 μm or 1.55 μm at the same device length. The nematic liquid crystal is selectively infiltrated in the cladding air holes to increase the birefringence in the introduced design. Further, the central hole is filled by a gold nanowire. The simulation results are obtained by using full vectorial finite element method with perfect matched layer boundary conditions. The numerical results reveal that the suggested splitter can split the x and y polarized modes at λ=1.31 and 1.55 μm at a short device length of 131.0 μm. The obtained crosstalk is -38 dB and -48 dB with bandwidths of 58 nm and 48 nm at λ= 1.31 μm for x and y polarized modes, respectively. In addition, crosstalk of -56 dB and -47 dB are achieved with bandwidths of 124 nm and 88 nm at λ= 1.55 μm for x and y polarized modes, respectively.

International Journal of Distributed and Parallel systems, 2011

The International Arab Journal of Information Technology, 2021

This paper introduces a new image encryption algorithm based on a Parallel Fuzzy Multi-Modular Ch... more This paper introduces a new image encryption algorithm based on a Parallel Fuzzy Multi-Modular Chaotic Logistic Map (PFMM-CLM). Firstly, a new hybrid chaotic system is introduced by using four parallel cascade chaotic logistic maps with a dynamic parameter control to achieve a high Lyapunov exponent value and completely chaotic behavior of the bifurcation diagram. Also, the fuzzy set theory is used as a fuzzy logic selector to improve chaotic performance. The proposed algorithm has been tested as a Pseudo-Random Number Generator (PRNG). The randomness test results indicate that system has better performance and satisfied all random tests. Finally, the Arnold Cat Map with controllable iterative parameters is used to enhance the confusion concept. Due to excellent chaotic properties and good randomization test results, the proposed chaotic system is used in image encryption applications. The simulation and security analysis indicate that this proposed algorithm has a very high securit...

2021 International Telecommunications Conference (ITC-Egypt)

This paper provides a new Cascade Modular Tent Logistic Map (CMTLM) with a simple structure, more... more This paper provides a new Cascade Modular Tent Logistic Map (CMTLM) with a simple structure, more variable parameters, more complex bifurcation diagram, and large Lyabanove exponent values to improve the chaotic properties of the suggested cryptosystem. Also, a Modified Hill Cipher (MHC) is introduced in cooperating with the Isomorphic Elliptic Curve Cryptography (IECC) to increase the key-space. Thus, the system can resist differential and statistical attacks. The proposed system is used as a Secure Satellite Image Encryption (SSIE) system, which serves as a protection scheme for satellite images based on isomorphic elliptic curve and cascade modular chaotic Tent Logistic map. Simulation results and performance analyses are presented to illustrate the effectiveness and efficiency of the proposed cryptosystem.

Indonesian Journal of Electrical Engineering and Computer Science

The substitution box (S-Box) is the main block in the encryption system, which replaces the non-e... more The substitution box (S-Box) is the main block in the encryption system, which replaces the non-encrypted data by dynamic secure and hidden data. S-Box can be designed based on complex nonlinear chaotic systems that presented in recent papers as a chaotic S-Box. The hardware implementation of these chaotic systems suffers from long processing time (low speed), and high-power consumption since it requires a large number of non-linear computational models. In this paper, we present a high-speed FPGA implementation of Parallel Multi-Layer Selector Substitution Boxes based on the Lorenz Chaotic System (PMLS S-Box). The proposed PMLS chaotic S-Box is modeled using Xilinx System Generator (XSG) in 32 bits fixed-point format, and the architecture implemented into Xilinx Spartan-6 X6SLX45 board. The maximum frequency of the proposed PMLS chaotic S-Box is 381.764 MHz, with dissipates of 77 mwatt. Compared to other S-Box chaotic systems, the proposed one achieves a higher frequency and lower ...

Multimedia Tools and Applications

IEEE Access

Securing transmission of information between legitimate transmitter and receiver sides is a great... more Securing transmission of information between legitimate transmitter and receiver sides is a great challenge for mathematicians, computer scientists and engineers in recent years. This paper aims at achieving three goals. The first of them is to introduce a novel fractional order two dimensional (2D) map having very complex chaotic behavior and distinct large positive values of Lyapunov exponents over wide range of parameters, compared with other 2D maps in literature. Secondly, a new reliable secure encryption scheme combining the associated chaotic pseudo-orbits of the proposed map with the advantages of elliptic curves in public key cryptography is suggested, for first time, and applied to colored images. The hybrid scheme is capable to confirm reliable secret keys exchange in addition to highly obscure and hide transmitted information messages. Finally, a thorough mathematical analysis of security performance and evaluation of encryption scheme immunity against all possible attacks are carried out and proved its efficiency and robustness. INDEX TERMS Chaos-based cryptography, chaotic maps, discrete fractional calculus, elliptic curves, pseudo-orbits.

Multimedia Security Using Chaotic Maps: Principles and Methodologies

Journal of Computer and Communications

A multiuser Ultra Wide Band (UWB) channel suffers seriously from realistic impairments. Among thi... more A multiuser Ultra Wide Band (UWB) channel suffers seriously from realistic impairments. Among this, multipath fading and interferences, such as Multiple Access Interference (MAI) and Inter Symbol Interference (ISI), that significantly degrade the system performance. In this paper, a polar coding technique, originally developed by Arikan, is suggested to enhance the BER performance of indoor UWB based Orthogonal Frequency Division Multiplexing (OFDM) communications. Moreover, Interleave Division Multiple Access (IDMA) scheme has been considered for multiuser detection depending on the turbo type Chip-By-Chip (CBC) iterative detection strategy. Three different models as Symmetric Alpha Stable (SαS), Laplace model and Gaussian Mixture Model (GMM), have been introduced for approximating the interferences which are more realistic for UWB system. The performance of the proposed Polar-coded IDMA OFDM-based UWB system is investigated under UWB channel models proposed by IEEE 802.15.3a working group and compared with Low Density Parity Check (LDPC)-coded IDMA OFDM-based UWB system in terms of BER performance and complexity under the studied noise models. Simulation results show that the complexity of the proposed polar-coded system is much lower than LDPC-coded system with minor performance degradation. Furthermore, the proposed polar-coded system is robust against noise and interferences in UWB indoor environment and gains a significant performance improvement by about 5 dB compared with un-coded IDMA-OFDM-UWB system under the studied noise models.