Algebraic break of image ciphers based on discretized chaotic map lattices

In this paper, we provide an algebraic cryptanalysis of a recently proposed chaotic image cipher. We show that the secret parameters of the algorithm can be revealed using chosen-plaintext attacks. Our attack uses the orbit properties of the permutation maps to deduce encryption values for a single round. Once a single round encryption is revealed, the secret parameters are obtained using simple assignments.This work was supported by the Scientific and Technological Research Council of Turkey (TUBITAK) under Project No. 106E143Publisher's VersionAuthor Post Prin

Cryptanalysis of Fridrich's chaotic image encryption

We cryptanalyze Fridrich's chaotic image encryption algorithm. We show that the algebraic weaknesses of the algorithm make it vulnerable against chosen-ciphertext attacks. We propose an attack that reveals the secret permutation that is used to shuffle the pixels of a round input. We demonstrate the effectiveness of our attack with examples and simulation results. We also show that our proposed attack can be generalized to other well-known chaotic image encryption algorithms.Scientific and Technological Research Council of Turkey (TUBITAK) [106E143]; Turkish Academy of Sciences [TUBA-GEBIP/2009]Ercan Solak and Cahit Cokal were supported by The Scientific and Technological Research Council of Turkey (TUBITAK) under Project No. 106E143. Turker Biyikoglu was supported by Turkish Academy of Sciences through Young Scientist Award Program (TUBA-GEBIP/2009).Publisher's Versio

Breaking an image encryption algorithm based on chaos

Recently, a chaos-based image encryption algorithm called MCKBA (Modified Chaotic-Key Based Algorithm) was proposed. This paper analyzes the security of MCKBA and finds that it can be broken with a differential attack, which requires only four chosen plain-images. Performance of the attack is verified by experimental results. In addition, some defects of MCKBA, including insensitivity with respect to changes of plain-image/secret key, are reported.Comment: 10 pages, 4 figure

Cryptography and Its Applications in Information Security

Nowadays, mankind is living in a cyber world. Modern technologies involve fast communication links between potentially billions of devices through complex networks (satellite, mobile phone, Internet, Internet of Things (IoT), etc.). The main concern posed by these entangled complex networks is their protection against passive and active attacks that could compromise public security (sabotage, espionage, cyber-terrorism) and privacy. This Special Issue “Cryptography and Its Applications in Information Security” addresses the range of problems related to the security of information in networks and multimedia communications and to bring together researchers, practitioners, and industrials interested by such questions. It consists of eight peer-reviewed papers, however easily understandable, that cover a range of subjects and applications related security of information

Analysis and Design Security Primitives Based on Chaotic Systems for eCommerce

Security is considered the most important requirement for the success of electronic commerce, which is built based on the security of hash functions, encryption algorithms and pseudorandom number generators. Chaotic systems and security algorithms have similar properties including sensitivity to any change or changes in the initial parameters, unpredictability, deterministic nature and random-like behaviour. Several security algorithms based on chaotic systems have been proposed; unfortunately some of them were found to be insecure and/or slow. In view of this, designing new secure and fast security algorithms based on chaotic systems which guarantee integrity, authentication and confidentiality is essential for electronic commerce development. In this thesis, we comprehensively explore the analysis and design of security primitives based on chaotic systems for electronic commerce: hash functions, encryption algorithms and pseudorandom number generators. Novel hash functions, encryption algorithms and pseudorandom number generators based on chaotic systems for electronic commerce are proposed. The securities of the proposed algorithms are analyzed based on some well-know statistical tests in this filed. In addition, a new one-dimensional triangle-chaotic map (TCM) with perfect chaotic behaviour is presented. We have compared the proposed chaos-based hash functions, block cipher and pseudorandom number generator with well-know algorithms. The comparison results show that the proposed algorithms are better than some other existing algorithms. Several analyses and computer simulations are performed on the proposed algorithms to verify their characteristics, confirming that these proposed algorithms satisfy the characteristics and conditions of security algorithms. The proposed algorithms in this thesis are high-potential for adoption in e-commerce applications and protocols

Kaos tabanlı hibrit simetrik ve asimetrik şifreleme algoritmaları tasarımı ve uygulaması

06.03.2018 tarihli ve 30352 sayılı Resmi Gazetede yayımlanan “Yükseköğretim Kanunu İle Bazı Kanun Ve Kanun Hükmünde Kararnamelerde Değişiklik Yapılması Hakkında Kanun” ile 18.06.2018 tarihli “Lisansüstü Tezlerin Elektronik Ortamda Toplanması, Düzenlenmesi ve Erişime Açılmasına İlişkin Yönerge” gereğince tam metin erişime açılmıştır.Bilişim alanında yaşanan hızlı gelişmeler ile birlikte, veri güvenliğinin sağlanması günümüzün en önemli konularından birisi olmuştur. Veri güvenliğinin sağlanması için daha yüksek güvenlik seviyesine sahip aynı zamanda etkin şifreleme sistemlerinin geliştirilmesine çalışılmaktadır. Modern şifreleme algoritmaları özellikle büyük boyutlu veriler ve gerçek zamanlı uygulamalarda ağır işlem yüklerinden dolayı performans kaybına sebep olmaktadır. Kaotik sistemlerin şifreleme tasarımında kullanılması, kaos ve kriptoloji bilimleri arasındaki ilişkinin ortaya konması sonucu ortaya çıkmıştır. Kaotik sistemler sahip olduğu özelliklerden dolayı, kriptolojik uygulamaların temel gereksinimleri olan karıştırma ve yayılma özelliklerini sağlamaktadırlar. Bu tez çalışmasının amacı, kaotik sistemlerin zengin dinamik özellikleri ile modern şifreleme algoritmalarının güçlü yönlerini bir araya getirerek, yüksek güvenlikli ve efektif kaos tabanlı hibrit şifreleme algoritmaları tasarımları gerçekleştirmektir. Tez çalışmasında aşağıdaki temel adımlar gerçekleştirilmiştir: i. Şifreleme çalışmalarında kullanılmak üzere literatürdeki kaotik sistemlere alternatif olarak, iki yeni kaotik sistem (NCS ve skala edilmiş Zhongtang) tasarlanmış ve analizleri yapılmıştır. Yapılan analizler ile yeni sistemlerin zengin dinamik özelliklere ve rasgeleliğe sahip olduğu gösterilmiştir. ii. Yeni geliştirilen kaotik sistemler ile geliştirilecek şifreleme algoritmalarında rasgele sayıların üretimi için iki yeni RSÜ tasarımı yapılmıştır. Yeni RSÜ'lerden elde edilen bit dizilerinin yeterli rasgeleliğe sahip oldukları, NIST 800-22 testleri ile ortaya konmuştur. iii. Blok şifreleme algoritmalarının en önemli bileşenlerinden olan S-Box üretimi için, yeni geliştirilen RSÜ'nün kullanıldığı yeni kaos tabanlı S-Box üretim algoritması geliştirilmiştir. Önerilen S-Box'lar üzerinde performans testleri gerçekleştirilmiştir. S-Box performans test sonuçları literatürdeki kaos tabanlı diğer çalışmalar ile karşılaştırılarak, önerilen S-Box'ların saldırılara karşı daha güçlü ve dayanıklı olduğu gösterilmiştir. iv. RSÜ ve S-Box algoritmalarının tasarımından sonraRSÜ-1 ile kaos tabanlı asimetrik şifreleme algoritması CRSA, RSÜ-2 ve S-Box üretim algoritmaları ile kaos tabanlı simetrik hibrit şifreleme algoritması CS-AES geliştirilmiştir. v. Yeni şifreleme algoritmaları ile resim şifreleme uygulamaları yapılmış ve şifreleme çalışmaları üzerinde güvenlik ve performans analizleri gerçekleştirilmiştir. Geliştirilen hibrit şifreleme algoritmalarının resim şifreleme uygulamalarına ait güvenlik ve performans analiz sonuçları, modern şifreleme algoritmalarının sonuçları ile karşılaştırılarak, saldırılara karşı daha güçlü ve dayanıklı, daha kısa sürede şifreleme gerçekleştiren ve efektif bellek kullanımına sahip oldukları gösterilmiştir

Fractal Analysis

Fractal analysis is becoming more and more common in all walks of life. This includes biomedical engineering, steganography and art. Writing one book on all these topics is a very difficult task. For this reason, this book covers only selected topics. Interested readers will find in this book the topics of image compression, groundwater quality, establishing the downscaling and spatio-temporal scale conversion models of NDVI, modelling and optimization of 3T fractional nonlinear generalized magneto-thermoelastic multi-material, algebraic fractals in steganography, strain induced microstructures in metals and much more. The book will definitely be of interest to scientists dealing with fractal analysis, as well as biomedical engineers or IT engineers. I encourage you to view individual chapters

The Effect of Emotional Intelligence Training via Method Psychodrama on Marital Satisfaction of Patients with MS

MS is a progressive and chronic disease of the central nervous system with symptoms that can be debilitating. Appropriate interventions including Emotional Intelligence Training improve the quality of life MS patients. The aim of this study is to determine the effect of emotional intelligence training through Psycho-Drama methods on marital satisfaction of patients with MS. This study is a one-group, before-after, quasi-experimental study. A total of 22 patients were enrolled in this study. The samples were selected through non-random sampling based on the goal of study among visitors of MS Society, Kurdistan province, Iran. Data collection tool was questionnaires with two sections: 1) demographic information and 2) ENRICH-B marital satisfaction questionnaire including 47 items. Intervention was conducting 20 sessions of 2-hour training. Questionnaires were filled by patients before and after intervention. Methods for data analysis were descriptive statistics (tables of relative frequency distribution, the mean, and standard deviation) and inferential statistics of paired t test. Paired t test showed a significant difference in total scores of marital satisfaction before and after training sessions (P < 0.05). Finally, we concluded that, designing and applying emotional intelligence training programs via psychodrama method is effective on marital satisfaction in patients with multiple sclerosis. Keywords: Multiple sclerosis, emotional intelligence training, psychodrama, marital satisfactio