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Random distribution of polydisperse ellipsoidal inclusions and homogenization estimates for porous elastic materials

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COMPUTERS & STRUCTURES 2018年第Nov.期210卷 87-101页

作者： Anoukou, K. Brenner, R. Hong, F. Pellerin, M. Danas, K. Ecole Polytech CNRS LMS F-91128 Palaiseau France Sorbonne Univ CNRS Inst Jean Le Rond dAlembert F-75005 Paris France Total R&D Carbonate Explorat & Prod F-64018 Pau France

This work proposes an extension of the well-known random sequential adsorption (rsa) method in the context of non-overlapping random mono- and polydisperse ellipsoidal inclusions. The algorithm is general and can deal with inclusions of different size, shape and orientation with or without periodic geometrical constraints. Specifically, polydisperse inclusions, which can be in terms of different size, shape, orientation or even material properties, allow for larger volume fractions without the need of additional changes in the main algorithm. Unit-cell computations are performed by using either the fast Fourier transformed-based numerical scheme (FFT) or the finite element method (FEM) to estimate the effective elastic properties of voided particulate microstructures. We observe that an isotropic overall response is very difficult to obtain for random distributions of spheroidal inclusions with high aspect ratio. In particular, a substantial increase (or decrease) of the aspect ratio of the voids leads to a markedly anisotropic response of the porous material, which is intrinsic of the rsa construction. The numerical estimates are probed by analytical Hashin-Shtrikman-Willis (HSW) estimates and bounds. (C) 2018 Elsevier Ltd. All rights reserved.

关键词： rsa algorithm Ellipsoidal inclusions FFT-based numerical homogenization Effective elastic properties Porous material

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Enhanced, Modified and Secured rsa Cryptosystem based on n Prime Numbers and Offline Storage for Medical Data Transmission via Mobile Phone

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INTERNATIONAL JOURNAL OF ADVANCED COMPUTER SCIENCE AND APPLICATIONS 2019年第10期10卷 353-360页

作者： Thiziers, Achi Harrisson Theodore, Haba Cisse Zoueu, Jeremie T. Michel, Babri INP HB DFR GEE Instrumentat Imaging & Spect Lab L2IS Yamoussoukro Cote Ivoire INP HB Abidjan Comp Sci & Telecoms Networks Lab LARIT Abidjan Cote Ivoire

The transmission of medical data by mobile telephony is an innovation that constitutes the m-health or more generally e-health. This telemedicine handles personal data of patients who deserve to be protected when they are transmitted via the operator or private network, so that malicious people do not have access to them. This is where cryptography comes in to secure the medical data transmitted, while preserving their confidentiality, integrity and authenticity. In this field of personal data security, public key cryptography or asymmetric cryptography is becoming increasingly prevalent, as it provides a public key to encrypt the transmitted message and a second private key, linked to the first by formal mathematics, that only the final recipient has to decrypt the message. The rsa algorithm of River and Shamir provides this asymmetric cryptography based on a public key and a private key, on two prime numbers. However, the factorization of these two prime numbers to give the variable N of rsa can be discovered by a hacker and thus make the security of medical data vulnerable. In this article, we propose a more secured rsa algorithm with n primes and offline storage of the essential parameters of the rsa algorithm. We performed a triple encryption-decryption with these n prime numbers, which made it more difficult to break the factorization of the variable N. Thus, the key generation time is longer than that of traditional rsa.

关键词： e-Health medical data transmission asymmetric cryptography rsa algorithm first numbers

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Evolution of SIM Cards - What's Next? 7

Evolution of SIM Cards - What's Next?

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7th International Conference on Computing, Communications and Informatics (ICACCI)

作者： Koshy, Deepu George Rao, Sethuraman N. Amritapuri Amrita Vishwa Vidyapeetham Amrita Sch Engn Amrita Ctr Wireless Networks & Applicat AmritaWNA Amritapuri India

ISBN: (纸本)9781538653142

Subscriber Identity Module (SIM) is an integrated circuit card on the mobile phone used for identifying and authenticating subscribers on mobile networks and for establishing a connection with the mobile network. Over the years, we have witnessed considerable change in the size of SIM card. SIM card size has reduced from 1FF (Form Factor) to 4FF (nano SIM), which is currently being used in smart phones. Apart from the size of the SIM getting smaller, the amount of storage a SIM could provide, the number of operator profiles a SIM could support and the file systems included in a SIM card have all improved over time. Virtual SIM or eSIM is a new technology to replace the traditional SIM and with remote provisioning it allows user to change the SIM profile remotely over the air. An eSIM that allows interoperability of operator profiles can handle Machine-to-Machine communication in a better way. This paper presents a study of the evolution of SIM with various usage scenarios of eSIM. In addition, it proposes a design for next generation SIM along with the implementation of a security algorithm between a SIM card and Service Provider.

关键词： SIM card file systems M2M virtual SIM security rsa algorithm

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Access Control System Based on Encryption in QR-Code Technology 4

Access Control System Based on Encryption in QR-Code Technol...

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4th IEEE International Symposium on Wireless Systems within the International Conferences on Intelligent Data Acquisition and Advanced Computing Systems (IDAACS-SWS)

作者： Susukailo, Vitalii Lakh, Yuriy Lviv Polytech Natl Univ Informat Secur Dept Vul Knyazya Romana 1 UA-79005 Lvov Ukraine

ISBN: (纸本)9781538675878

The subject matter of this paper is to provide information security for an authorized data within the access control systems using encryption technique in QR-code technology. The research goal was investigation of providing secure access control systems using cryptosystem based on rsa algorithm and pseudorandom number generator. The task was to develop an application encrypting information to provide information security for access control systems using encryption techniques in QR-code technology. The following results were obtained: main characteristics of access control system built on QR-code technology have been described;advantages of this technology have been investigated and also have been compared with the other access control systems;software application encrypting QR-codes for an authorized access has been created.

关键词： cryptosystem encryption decryption QR-code technology scanner pseudorandom number generator rsa algorithm RBAC AES

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Design of password encryption model based on AES algorithm

Design of password encryption model based on AES algorithm

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IEEE International Conference on Civil Aviation Safety and Information Technology (ICCASIT)

作者： Ying Liu Wei Zhang Xinxia Peng Yan Liu Sida Zheng Tongjia Wei Liang Wang State Grid Jibei Electric Power Company Limited Beijing China NARI Group Corporation / State Electric Power Research Institute Nanjing China

ISBN: (纸本)9781728125992

Aiming at the demand for information system password encryption protection, this paper proposed a new set of password storage and transmission encryption model. In the process of password storage encryption, this paper built two keys included main key and working key, main key is responsible for the working key encryption, working key is responsible for the password encryption and updated automatically at regular intervals. In the process of password transmission encryption using AES algorithm, this paper improved the AES password transmission encryption process, adopted the method of password adding random number as a key to encrypted password. On this basis, this paper introduced rsa transmission encryption process, and compared AES with rsa in the process of transmission encryption. Experiments show that advanced AES process is faster than the rsa process and system has higher practicability and security.

关键词： Information system Password encryption AES algorithm Key management rsa algorithm rsa algorithm Passwords Computer based information systems cryptography Key management AES gene Auger electron spectroscopy rsa

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Securing Medical Images for Mobile Health Systems Using a Combined Approach of Encryption and Steganography 14th

Securing Medical Images for Mobile Health Systems Using a Co...

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14th International Conference on Intelligent Computing (ICIC)

作者： Jiang, Tao Zhang, Kai Tang, Jinshan Wuhan Univ Sci & Technol Coll Comp Sci & Technol Wuhan 430065 Hubei Peoples R China Michigan Technol Univ Sch Technol Houghton MI 49931 USA

ISBN: (纸本)9783319959573;9783319959566

In this paper, we propose a medical image encryption scheme which can be used in mobile health systems. The proposed scheme combines rsa algorithm, logistic chaotic encryption algorithm, and steganography technique to secure medical images. In the proposed scheme, we encrypt a medical image based on chaotic sequence and encrypt the initial value of the chaotic sequence using the rsa encryption algorithm. The encrypted information by rsa is hidden in the Image. Only legitimate users can obtain the parameter information and restore the image. In the receiver side, we apply the inverse methods to get the original image after an encrypted image is arrived. We have implemented a simple application on the Android platform and have evaluated its performance. The experimental results show that the proposed image encryption scheme is practical and feasible for mobile health systems.

关键词： Medical image encryption rsa algorithm Chaos F5 steganography Mobile phones

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A Hybrid Security algorithm for rsa Cryptosystem 4

A Hybrid Security Algorithm for RSA Cryptosystem

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4th International Conference on Advanced Computing and Communication Systems (ICACCS)

作者： Panda, Prabhat K. Chattopadhyay, Sudipta Jadavpur Univ Dept Elect & Telecommun Engn Kolkata India

ISBN: (纸本)9781509045594

This paper presents a new Hybrid security algorithm for rsa cryptosystem named as Hybrid rsa (Hrsa). Here computation of "public key" (P) as well as "private key" (Q) depends on the value of M, where M is the product of four prime numbers. So complexity involved in factorizing the variable M increases. Another interesting feature about this algorithm is that the computation of P and Q involves the computation of some more intermediate factors which makes the computation more complex. In other existing works, the variable x or M is transferred during encryption and decryption process. However, this approach eliminates the transfer of variable x and M, where x represents the multiplication of two prime numbers a and b. Thus the proposed approach provides more secure path for encryption and decryption process. To substantiate this fact, the "key generation time", "encryption speed" and "decryption speed" of the proposed Hrsa have been compared with conventional rsa and Ersa algorithms.

关键词： complexity cryptosystem decryption encryption prime number private Key public Key rsa algorithm

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Secure MIMO Visible Light Communication System Based on User's Location and Encryption

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JOURNAL OF LIGHTWAVE TECHNOLOGY 2017年第24期35卷 5324-5334页

作者： Mousa, Farag Ibrahim Khalifa Al Maadeed, Noor Busawon, Krishna Bouridane, Ahmed Binns, Richard Northumbria Univ Fac Engn & Environm Newcastle Upon Tyne NE1 8ST Tyne & Wear England Qatar Univ Dept Comp Sci & Engn Doha 2713 Qatar

Visible light communication systems are rapidly growing research areas with wide applications ranging from illumination and data communication. To achieve high data rates in such systems, a number of techniques have been employed such as equalization of transmission signals, deployment of complex data modulation and the use of multiple input multiple output (MIMO) systems. However, security in wireless telecommunication systems is a common concern. This paper proposes a secure MIMO-VLC system that relies on the position of the user by incorporating a new modified version of the Rivest-Shamir-Adleman (rsa) technique for encrypting the transmitted data in the media access control MAC layer. The performance of the positioning method is evaluated showing a positioning accuracy of less than 5 cm for a signal-to-noise ratio of 15 dB. Furthermore, the ability of the proposed system to control the size of the encrypted cell, depending on the application environment, is demonstrated.

关键词： Cryptography decryption encryption encrypted cell indoor positioning light emitting diodes localization MIMO received signal strength indication rsa algorithm trilateration method visible light communication (VLC)

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Research on Cache Timing Attack Against rsa with Sliding Window Exponentiation algorithm

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INTERNATIONAL JOURNAL OF INTERDISCIPLINARY TELECOMMUNICATIONS AND NETWORKING 2016年第2期8卷 88-95页

作者： Chen, Caisen Xiang, Yangxia DengLiu, Yuqin Zhou, Zeyun Acad Armored Forces Engn Minist Sci Res Beijing Peoples R China Acad Armored Forces Engn Dept Informat Engn Beijing Peoples R China

The vulnerabilities of the rsa cryptographic algorithm are analyzed, and it is not securely implemented. As the simultaneous multithreading could enable multiple execution threads to share the execution resources of a superscalar between the chipper process and the spy process, the shared access to memory caches provides an easily used high bandwidth covert channel between threads, allowing that a malicious thread can monitor the execution of another thread. This paper targets at rsa algorithm which is implemented with sliding window exponentiation algorithm via OpenSSL, the attacker can monitor the cryptographic thread by executing a spy thread, recording the timing characteristic during the rsa decryption when reading the Cache. The attacker can recover the original key via analyzing these timing measurements. Finally, the authors provide some countermeasures of how this attack could be mitigated or eliminated entirely.

关键词： Data-Cache Attack Micro-Architectural Analysis rsa algorithm Side Channel Attacks Sliding Window Exponentiation

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Encryption algorithm using Dual Modulus 3

Encryption Algorithm using Dual Modulus

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3rd IEEE International Conference on Computational Intelligence and Communication Technology (CICT)

作者： Manu Goel, Aarti ABES Engn Coll Ghaziabad India

ISBN: (纸本)9781509062188

Dual modulus play important role in increasing the complexity of decomposing values into factors as compared to single modulus. This paper is based on rsa algorithm. Proposed encryption algorithm is more secure as compared to rsa algorithm since it uses dual modulus. This algorithm uses double encryption and decryption using double private and public keys to provide security against Brute-force attacks. Therefore, if an intruder detects a single key of cryptosystem even then it is not possible to decrypt the message. The basic motivation behind this paper is that in conventional rsa algorithm if we can factor modulus (n) into its prime numbers then we can generate private key. So in order to remove this weakness we can use dual modulus and improve the security of the system substantially.

关键词： rsa algorithm Cryptography Encryption decryption Dual Modulus Public key vs. secret key cryptography

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