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Article
An Enhancement Method Based on Modifying CFB Mode for Key Generation in AES Algorithm

Authors: Dalal N.Hammod --- MahaA.Hamood Al-Rawi --- Hasanen S. Abdulah
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 6 Part (B) Scientific Pages: 759-768
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

There are two very important characteristics in the block cipher, the amount of time for encryption process and key complexity which caused increasing the complexity of encryption process. This research aims to enhance the key generation of Advanced Encryption Standard (AES) algorithm with high efficiency. The proposed enhancement method architecture based on modifying cipher feedback (MCFB) mode which produce key block from each key generation step in addition to represent current output that is repeated lyre used as input to produce next key block. In the block cipher encryption step, two processes are implemented: Substitution bytes process and Shift rows process. This proposed method improves the performance, efficiency, and speed of the encryption algorithm.


Article
Design and Analysis of 19 cell PCF for Robust Single Mode Operation usingAvoided-Crossing Modes Approach

Authors: Riyadh MwadNaife --- Ahmed TomanThahab
Journal: Journal of University of Babylon مجلة جامعة بابل ISSN: 19920652 23128135 Year: 2017 Volume: 25 Issue: 1 Pages: 89-97
Publisher: Babylon University جامعة بابل

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Abstract

Double-cladding large mode area rod-type photonic crystal fibers have become a key component for power scaling in high power fiber laser systems to provide an ultra large effective area. By a careful design, the single-mode regime can be obtained insuch large core active fibers. In this paper, the 19-cell photonic crystal fibers with 3 rings in the fiber inner cladding have been investigated with the avoided-crossing approach, in order to find guidelines for the design of single-mode fibers. The air-hole diameter and the wavelength have been changed.In a certain point of air-holes diameter and the wavelength for 19cell PCF, the avoided crossing between HOMs has been occurred. In this point, the confinement loss of HOMs is increased which is more ensured for SM operation

الالياف البلورية الفوتونية ذات النوع الصلب والاطار المضاعف اصبحت الاداة المفتاح لتحسين الياف القدرة العالية في انظمة الليزر لتوفير مساحة فعالة عالية جدا. بواسطة تصميم معين ،ممكن الحصول على نمط احادي الطور في قلب هكذا الياف فعالة. في هذا البحث الاليافالبلورية الفوتونية ذات 19 خلية مع ثلاث حلقات من الفجوات في اطار الالياف تم التحقق منها مع طريقة الاطوار المتقاطعة المتحاشية لكي نجد دليل لتصميم الياف احادية الطور.قطر الفجوة الهوائية والطول الموجي قد تم تغيرهم خلال المحاكاة. في نقطة معينة من قطر الفجوة الهوائية والطول الموجي للالياف البلورية الفوتونية،الاطوار المتقاطعة المتحاشية قد تم الحصول عليها. وفي هذا النقطة، فان تداخل التوافقيات ذات الدرجة العالية داخل قلب الفايبر سوف يقل وهذا يودي الى زيادة نسبة عملية احادية الطور

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