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Office Phone: 0090 312 210 5016
Email: cihangir (at) metu (dot) edu (dot) tr

Postal Address (on leave):
Dr. Cihangir Tezcan
Orta Doğu Teknik Üniversitesi

Fen-Edebiyat Fakültesi Dekanlığı

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 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.

Program Committee Member

2019: ICISSP 2019
SIN'18, ICISSP 2018
2015: SIN'15, ICISSP 2015, ISCTURKEY 2015
2014: SIN'14
2013: SIN'13

 Organizing Committee Member

2013: ISCTURKEY 2013, Ankara Cryptology Seminars

Conference Refereeing

2016: CHES 2016
2015: SAC 2015, Latincrypt 2015, WCC 2015, CT-RSA 2015, FSE 2015
2011: Lightsec 2011

Journal Refereeing

IET Information Security
- The Computer Journal
- Security and Communication Networks


- Asuman Şenol, 2016-2017, Thesis: Improved Differential Attacks on RECTANGLE, MSc degree awarded on 7th August 2017
- Erol Doğan, 2016-2017, Thesis: Differential Factors and Differential Cryptanalysis of Block Cipher PRIDE, MSc degree awarded on 7th July 2017
- Rusydi Hasan Makarim, 2013-2014, Thesis: Relating Undisturbed Bits to Other Properties of S-boxes, MSc degree awarded on 30th June 2014


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