Improving key stream generation for sosemannk stream cipher using two fish block cipher
مقدم أطروحة جامعية
الجامعة
الجامعة التكنولوجية
الكلية
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القسم الأكاديمي
قسم علوم الحاسوب
دولة الجامعة
العراق
الدرجة العلمية
دكتوراه
تاريخ الدرجة العلمية
2008
الملخص الإنجليزي
Cryptographic techniques play an important role in network security and stream ciphers are one of the main cryptographic techniques that play a very important pan in maintaining security and protecting valuable information from potential misuse. This thesis will introduce updated concepts to stream cipher which are: let the size of slates in LFSR equal to 32 bits rather than 1 bit, let the block cipher algorithm generate initial values of states in LFSR, let the linear complexity of LFSR increased by using key-dependent Sboxes which are derived from block cipher algorithm with using FSM, Also this thesis will introduce two proposal algorithms (Snowfish 1) and the (Snowfish 2) to improve the Sosemanuk stream cipher algorithm by benefiting from the efficient properties of the Two fish block cipher and also use its key schedule, key-dependent Sbox to increase the security, randomness and try to avoid the guess and determine attack of Sosemanuk.
These two proposals use Two fish algorithm rather than Serpent algorithm which was used in the Sosemanuk and also they use key-dependent Sbox rather than static Sbox, They are similar in the same key length (128 to 256 bit), IV length (128 bit), LFSR, FSM and output transformation. This thesis is implemented using Visual Basic 6, 0 language on PC computer type P4 with RAM 504 MB and 2.00 GHz with Intel processor to perform these two proposed systems and also to perform the Sosemanuk system to make a comparison between them by using the tests of randomness, the structural tests and the complexity of the algorithm.
These tests give results that shows the two proposed systems have good results in increasing the security and randomness compared
التخصصات الرئيسية
تكنولوجيا المعلومات وعلم الحاسوب
الموضوعات
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
Muhammad, Rana Sad. (2008). Improving key stream generation for sosemannk stream cipher using two fish block cipher. (Doctoral dissertations Theses and Dissertations Master). University of Technology, Iraq
https://search.emarefa.net/detail/BIM-305152
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
Muhammad, Rana Sad. Improving key stream generation for sosemannk stream cipher using two fish block cipher. (Doctoral dissertations Theses and Dissertations Master). University of Technology. (2008).
https://search.emarefa.net/detail/BIM-305152
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
Muhammad, Rana Sad. (2008). Improving key stream generation for sosemannk stream cipher using two fish block cipher. (Doctoral dissertations Theses and Dissertations Master). University of Technology, Iraq
https://search.emarefa.net/detail/BIM-305152
لغة النص
الإنجليزية
نوع البيانات
رسائل جامعية
رقم السجل
BIM-305152
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
أضخم قاعدة بيانات عربية للاستشهادات المرجعية للمجلات العلمية المحكمة الصادرة في العالم العربي
تقوم هذه الخدمة بالتحقق من التشابه أو الانتحال في الأبحاث والمقالات العلمية والأطروحات الجامعية والكتب والأبحاث باللغة العربية، وتحديد درجة التشابه أو أصالة الأعمال البحثية وحماية ملكيتها الفكرية. تعرف اكثر