COMPARISON OF ENCRYPTION ALGORITHMS STRENGTH USED IN 3G MOBILE COMMUNICATION

Yıl 2016, Cilt: 17 Sayı: 1, 1 - 11, 01.06.2016

Fatma Akgün , Ercan Buluş

Öz

In this study, the strength of data encryption algorithms used in UMTS and CDMA2000 systems which are 3G mobile communication technologies were analyzed. At the beginning of the study, software applications were developed for KASUMI encryption algorithm which is used within UMTS system and AES encryption algo-rithm which is used within CDMA2000 system. Both key generation algorithms are applied to the same key values to create new key values which are used for data encryption. These new key values are tested by using test package of NIST to in order to check whether these key values are generated randomly or not. One of the key value which has high randomness is used as encryption key As a result, it was observed that AES algo-rithm is more successful than 

KASUMI algorithm in generating key values. Additionally, a key value, which has high randomization, was chosen and this key value was applied on encryption algorithm with plain text statement and as a result appli-cation of encrypted text on NIST test, it was observed that both KASUMI and AES block encryption algo-rithms have equally power in 3G mobile technology.

* This paper is based on a Ph.D study titled “The Structure of Mobile Communication Technologies and Anal-ysis of the Reliability of Data Encryption Algorithms Used in These Technologies”

Anahtar Kelimeler

Security, Mobile communication, KASUMI, AES, NIST tests

3G MOBİL HABERLEŞME İÇERİSİNDE KULLANILAN ŞİFRELEME ALGORİTMALARININ GÜCÜNÜN KARŞILAŞTIRILMASI

Öz

Bu çalışmanın amacı 3G mobil iletişim teknolojilerinden CDMA2000 ve UMTS sistemlerinde yer alan veri şif-releme algoritmalarının gücünün karşılaştırılmalı analizidir. Öncelikle UMTS teknolojisi içerisinde yer alan KASUMI şifreleme algoritması ve CDMA2000 teknolojisi içerisinde yer alan AES şifreleme algoritmaları için yazılım geliştirilmiştir. Yeni şifreleme anahtarları elde etmek için her iki anahtar üretme algoritmasına aynı anahtar değerler uygulanmış ve elde edilen yeni anahtar değerler rassallıkları test edilmek üzere NIST testlerin-den geçirilmiştir. 

Rassalığı yüksek olan anahtar değerlerinden biri şifreleme anahtarı olarak kullanılmıştır. Çalışma sonunda, şif-releme algoritması içerisinde, açık metni şifrelemek için kullanılacak olan yeni anahtar değerlerinin üretiminde AES algoritmasının KASUMI algoritmasına oranla güçlü olduğu sonucu ortaya çıkmıştır. Çalışmada ayrıca yüksek 

randomizasyon veren anahtar değerlerinin kullanımı ile yapılan şifreleme işlemi sonucuna göre 3G teknolojisi içerisinde yer alan KASUMI ve AES şifreleme algoritmalarının eşit derecede şifreleme gücüne sahip olduğu or-taya çıkmıştır.

* Bu çalışma “Mobil İletişim Teknolojilerinin Yapısı ve Bu Teknolojilerde Kullanılan Veri Şifreleme Algorit-malarının Güvenirliklerinin Analizi” adlı doktora tezinden üretilmiştir.

Anahtar Kelimeler

Güvenlik, Mobil iletişim, KASUMI, AES, NIST testleri

Kaynakça

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