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Search Publications by: Meltem Sonmez Turan ()

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Displaying 26 - 34 of 34

Third-Round Report of the SHA-3 Cryptographic Hash Algorithm Competition

November 15, 2012
Author(s)
Shu-jen H. Chang, Ray A. Perlner, William E. Burr, Meltem Sonmez Turan, John M. Kelsey, Souradyuti Paul, Lawrence E. Bassham
The National Institute of Standards and Technology (NIST) opened a public competition on November 2, 2007 to develop a new cryptographic hash algorithm - SHA-3, which will augment the hash algorithms specified in the Federal Information Processing Standard

On the Nonlinearity of Maximum-length NFSR Feedbacks

August 14, 2012
Author(s)
Meltem Sonmez Turan
Linear Feedback Shift Registers (LFSRs) are the main building block of many classical stream ciphers; however due to their inherent linearity, most of the LFSR-based designs do not offer the desired security levels. In the last decade, using Nonlinear

Evolutionary Construction of de Bruijn Sequences

July 20, 2012
Author(s)
Meltem Sonmez Turan
A binary de Bruijn sequence of order n is a cyclic sequence of period 2^n, in which each n-bit pattern appears exactly once. These sequences are commonly used in applications such as stream cipher design, pseudo-random number generation, 3-D pattern

Status Report on the Second Round of the SHA-3 Cryptographic Hash Algorithm Competition

February 23, 2011
Author(s)
Meltem Sonmez Turan, Ray A. Perlner, Lawrence E. Bassham, William E. Burr, Dong H. Chang, Shu-jen H. Chang, Morris J. Dworkin, John M. Kelsey, Souradyuti Paul, Rene C. Peralta
The National Institute of Standards and Technology (NIST) opened a public competition on November 2, 2007 to develop a new cryptographic hash algorithm - SHA-3, which will augment the hash algorithms currently specified in the Federal Information

Cryptanalysis of the ESSENCE Family of Hash Functions

November 30, 2010
Author(s)
Nicky Mouha , Gautham Sekar, Jean-Philippe Aumasson , Thomas Peyrin, Soren S. Thomsen , Meltem Sonmez Turan, Bart Preneel
ESSENCE is a family of cryptographic hash functions, accepted to the first round of NIST's SHA-3 competition. This paper presents the first known attacks on ESSENCE. We present a semi-free-start collision attack on 31 out of 32 rounds of ESSENCE-512

Practical Near-Collisions for Reduced Round Blake, Fugue, Hamsi and JH

August 23, 2010
Author(s)
Meltem Sonmez Turan, Erdener Uyan
A hash function is near-collision resistant, if it is hard to find two messages with hash values that differ in only small number of bits. In this study, we used hill climbing methods to find near-collisions for some of the second round SHA-3 candidates

On Feedback Functions of Maximum Length Nonlinear Feedback Shift Registers

August 2, 2010
Author(s)
Cagdas Calik, Meltem Sonmez Turan, Ferruh Ozbudak
Feedback shift registers are basic building blocks for many cryptographic primitives. Due to the insecurities of Linear Feedback Shift Register (LFSR) based systems, the use of Nonlinear Feedback Shift Registers (NFSRs) became more popular. In this work