Cihangir Tezcan

E-mail

cihangir@metu.edu.tr

Department

Graduate School of Informatics

ORCID

0000-0002-9041-1932

Scopus Author ID

24447139500

Web of Science Researcher ID

D-1331-2010

FPGA-friendly compact and efficient AES-like 8 × 8 S-box Malal, Ahmet; Tezcan, Cihangir (2024-03-01) One of the main layers in the Advanced Encryption Standard (AES) is the substitution layer, where an 8 × 8 S-Box is used 16 times. The substitution layer provides confusion and makes the algorithm resistant to cryptanalysi...
Differential-Linear Cryptanalysis of ASCON: Theory vs. Practice Tezcan, Cihangir (2023-06-22)
Experimentally Obtained Differential-Linear Distinguishers for Permutations of ASCON and DryGASCON Civek, Aslı Başak; Tezcan, Cihangir (Springer Cham, 2023-01-01) DryGASCON and Ascon are two similar authenticated encryption algorithms submitted to NIST’s recently finalized lightweight cryptography competition. DryGASCON was eliminated after the second round, while Ascon won the comp...
Cryptographic Foundations of Blockchain Technology Tezcan, Cihangir (CRC, New York , 2022-09-01)
Key lengths revisited: GPU-based brute force cryptanalysis of DES, 3DES, and PRESENT Tezcan, Cihangir (2022-03-01) Lightweight cryptographic algorithms that are tailored for resource-constrained devices sometimes use short keys which might be susceptible to brute force attacks. Such attacks using CPU or GPU might be costly because some...
GPU accelerated 3DES encryption Altınok, Kaan Furkan; Peker, Afşin; Tezcan, Cihangir; Temizel, Alptekin (2021-07-01) Triple DES (3DES) is a NIST and ISO/IEC standard block cipher that is also used in some web browsers and several electronic payment applications. We propose an optimized bit-level parallelization of 3DES for GPU accelerate...
Weak-Key Distinguishers for AES Grassi, Lorenzo; Rechberger, Christian; Leander, Gregor; Tezcan, Cihangir; Wiemer, Friedrich (Springer, Cham, 2021-01-01) In this paper, we analyze the security of AES in the case in which the whitening key is a weak key.After a systematization of the classes of weak-keys of AES, we perform an extensive analysis of weak-key distinguishers (in...
Optimization of Advanced Encryption Standard on Graphics Processing Units Tezcan, Cihangir (2021-01-01) Graphics processing units (GPUs) are specially designed for parallel applications and perform parallel operations much faster than central processing units (CPUs). In this work, we focus on the performance of the Advanced ...
Weak-Key Distinguishers for AES Grassi, Lorenzo; Leander, Gregor; Rechberger, Christian; Tezcan, Cihangir; Wiemer, Friedrich (2021-01-01) In this paper, we analyze the security of AES in the case in which the whitening key is a weak key.
Anomaly-Based Intrusion Detection by Machine Learning: A Case Study on Probing Attacks to an Institutional Network Tufan, Emrah; Tezcan, Cihangir; Acartürk, Cengiz (2021-01-01) Cyber attacks constitute a significant threat to organizations with implications ranging from economic, reputational, and legal consequences. As cybercriminals' techniques get sophisticated, information security profession...

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