Coding theory and cryptography

Channel estimation techniques for OFDM systems based on a pilot arrangement are investigated. Channel estimation based on a comb type pilot arrangement is studied through different algorithms for both estimating the channel at pilot frequencies and interpolating the channel. Channel estimation at pilot frequencies is…

• SİNEM ÇÖLERİ

Channel estimation techniques for OFDM systems based on a pilot arrangement are investigated. Channel estimation based on a comb type pilot arrangement is studied through different algorithms for both estimating the channel at pilot frequencies and interpolating the channel. Channel estimation at pilot frequencies is…

• MUSTAFA ERGEN

Montgomery multiplication methods constitute the core of modular exponentiation, the most popular operation for encrypting and signing digital data in public-key cryptography. In this article, we study the operations involved in computing the Montgomery product, describe several high-speed, space-efficient algorithms…

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The authors provide an analysis of the performance of optical orthogonal codes in an optical code division multiple access (CDMA) network by considering the probability distribution of the interference patterns. It is shown that the actual performance is close to a previous estimate. A less structured temporal code in…

We present a new low-complexity bit-parallel canonical basis multiplier for the field GF(2m) generated by an all-one-polynomial. The proposed canonical basis multiplier requires m/sup 2/-1 XOR gates and m/sup 2/ AND gates. We also extend this canonical basis multiplier to obtain a new bit-parallel normal basis multipl…

• ÇETİN KAYA KOÇ

An efficient algorithm for the multiplication in GF(2/sup m/) was introduced by Mastrovito. The space complexity of the Mastrovito multiplier for the irreducible trinomial x/sup m/+x+1 was given as m/sup 2/-1 XOR and m/sup 2/ AND gales. In this paper, we describe an architecture based on a new formulation of the multi…

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• AHMET ZENGİN
• İHSAN PEHLİVAN
• SEZGİN KAÇAR

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• AHMET ZENGİN
• İHSAN PEHLİVAN
• ÜNAL ÇAVUŞOĞLU

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• AHMET ZENGİN
• İHSAN PEHLİVAN

For the first time Boolean functions on 9 variables having nonlinearity$241$are discovered, that remained as an open question in literature for almost three decades. Such functions are found by heuristic search in the space of rotation symmetric Boolean functions (RSBFs). This shows that there exist Boolean functions…

• SELÇUK KAVUT