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26 February 2018: Although I cryptanalyzed ciphers designed by others all this time, for the first time in my life, as a part of my research at RUB with Gregor Leander, I designed a block cipher. Silent Encryption Decryption Algorithm (SEDA for short, which means "sound" in Turkish) is the first cipher that is designed specifically for GPU architecture. Click here for the SILENT cipher page. 18 January 2018: I returned to METU and moved back to Turkey. Please do not send anything to my German address. I am currently teaching Cyber Security and Cryptography courses as an adjunct faculty at Department of Cyber Security. I will teach CSEC507 Applied Cryptology and CSEC502 Network Security at Spring 2018 Semester. 03 April 2017: I am currently on leave until 2018. I am doing post-doctoral research at RUHR Universitat Bochum, Germany with Gregor Leander's Symmetric Cryptography Group. I hold a permanent researcher position at Department of Mathematics, Middle East Technical University at Ankara, Turkey. I am also an affiliated faculty at Department of Cyber Security, Institute of Informatics and Department of Cryptography, Institute of Applied Mathematics. I have left Ecole Polytechnique Federale de Lausanne (EPFL) and I am no longer using my EPFL email address. During my MS and PhD studies, I focused mainly on block cipher cryptanalysis and I discovered the Improbable Differential Cryptanalysis. I provided the best known attacks on the block ciphers HIGHT (standardized at South Korea), CLEFIA (developed by SONY Corporation), and SERPENT (AES candidate). I visited EPFL in 2010 for 1 year and I did reasearch on provable security under the supervision of Prof. Serge Vaudenay and on GHS attack and genus 2 curves under the supervision of Prof. Arjen Lenstra.
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