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Article
CQTRU: A Commutative Quaternions Rings Based Public Key Cryptosystem

Authors: Nadia M.G. Alsaidi --- Ahmad T. Sadiq --- Ali A. Majid
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 6 Part (B) Scientific Pages: 901-911
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In this paper, we propose a new version of the NTRU public key cryptosystem called CQTRU. It is a four-dimensional cryptosystem based on the commutative quaternion ring. This public key system has an ability to encrypt four sets of data in each session. Therefore, it gains the positive points and the strength of NTRU cryptosystems. The definition of the ring of CQTRU is introduced with the definition of its operations. The three phases of the new proposed system (key generation, encryption and decryption) are discussed in details, in addition to the decryption failure probability, key security and message security. Finally, the resistance of CQTRU's against lattice attack is investigated.


Article
Fingerprints Authentication Using Grayscale Fractal Dimension

Authors: Wael J. Abdulaal --- Arkan J. Mohammed --- Nadia. M. G. Alsaidi
Journal: Al-Mustansiriyah Journal of Science مجلة علوم المستنصرية ISSN: 1814635X Year: 2018 Volume: 29 Issue: 3 ICSSSA 2018 Conference Issue Pages: 106-112
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Characterizing of visual objects is an important role in pattern recognition that can be performed through shape analysis. Several approaches have been introduced to extract relevant information of a shape. The complexity of the shape is the most widely used approach for this purpose where fractal dimension and generalized fractal dimension are methodologies used to estimate the complexity of the shapes. The box counting dimension is one of the methods that used to estimate fractal dimension. It is estimated basically to describe the self-similarity in objects. A lot of objects have the self-similarity; fingerprint is one of those objects where the generalized box counting dimension is used for recognizing of the fingerprints to be utilized for authentication process. A new fractal dimension method is proposed in this paper. It is verified by the experiment on a set of natural texture images to show its efficiency and accuracy, and a satisfactory result is found. It also offers promising performance when it is applied for fingerprint recognition.

لوصف الاشكال المرئية دور مهم في التعرف على الأنماط من خلال الشكل العام ولقد تم استخدام عدة أساليب في استخراج المعلومات ذات الصلة من الشكل ولقد كان تعقيد الشكل هو الأسلوب الأكثر استخداماً لهذا الغرض وقد اعتمد البعد الكسوري كمنهج لتقدير درجة التعقيد في هذه الاشكال. يُعد بُعد المربع أحد الطرق المستخدمة في تقدير الابعاد. ويستعمل اساساً لوصف التشابه الذاتي في هذه الاشكال. الكثير من الاشكال تمتاز بخاصية التشابه الذاتي ومنا البصمة والبصمة هي من تلك الاشكال التي يتم فيها استخدام بُعد المربع للتعرف على بصمات الأصابع لاستخدامها في عملية التحقق والمصادقة.في هذا الحث نقترح طريقة بعد كسوري جديد يستخدم للتحقق والمصادقة على صور طبيعية وتظهر في هذه الطريقة الكفاءة والدقة عند تطبيقها والمصادقة على بصمات الأصابع.

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