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The work in this research demonstrates a color image encryption decryption algorithm by utilities chaotic maps to generated pseudo number generator. In this research combine two Logistic maps to generate the Key. The key generated is used in confusion and diffusion stages. Through the confusion stage is permutated the pixel of image while in diffusion stage the value for each pixel is change. The security and performance of this techniques has been analysis through statically analysis and key space analysis. The data has been shown that the performance for this algorithm was very accurate and fast.

In this paper, we consider a new method of coding and decoding algorithms using Jacobsthal and Jacobsthal-Lucas numbers. The method is based on the blocked message matrices. The main idea of the method is the encryption of each message matrix with different keys. Coding and decoding algorithms are of great importance to help in improving information security because information security in recent days becomes a more important matter in terms of data transfer over communication channel.

تـُشكـّلُ مجموعةُ نقاطِ المنحنى الإهليليجيةِ زمرة أبدالية، التي اعتبرت كاختيار مناسب لبِناء مشكلة مشابهة لمشكلةِ اللوغاريتمِ المنفصلةِ. هذا يُنشأ ويفتح باب جديد لمعالجةِ زمراً خاصة وعمليات جديدة. في هذا البحث، حاولنا الاستفادة نظام ديفي- هيلمان لاستبدال المفاتيح وذلك باستعمالها كمفتاح سري في طريقتين مقترحتين للتشفير باستخدام المنحنيات الإهليليجيِة.

مع التوسع السريع في علوم وشبكات الحاسوب، اصبح من السهل نقل البيانات الكبيرة عبر تلك الشبكات. هذا الأمر يتطلب توفير الحماية والامنية اللازمة لنقل تلك البيانات بعيدا عن عيون المهاجمين او المخربين. التشفير هو احد الأساليب لحماية نقل البيانات في الشبكات المفتوحة. في هذا البحث تم اقتراح خوارزمية لتشفير النص الصريح المدخل وكذلك توليد مفتاح التشفير بالاعتماد على خوارزمية لتوليده وارساله ضمن النص المشفر لأجل زيادة الحفاظ علم المفتاح السري وضمانا لعدم تداوله عبر الشبكات المفتوحة ٠

During the last decades, information security has become a major issue. Encrypting and decrypting data have recently been widely investigated and developed because there is a demand for a stronger encryption and decryption which is very hard to crack. Cryptography plays major roles to fulfilment these demands. Nowadays, many of researchers have proposed many of encryption and decryption algorithms such as AES, DES and others. But most of the proposed algorithms encountered some problems such as lack of robustness added to packet delay to maintain the security on the communication channel between the terminals. In this paper, the security goals were enhanced via \"A New Approach for Block Cipher\" which maintains the security on the communication by making it difficult for attacker to crack as well as speed of the encryption / decryption scheme.