$ whoami

Mostafizar Rahman

Research Fellow @ , NTU SingaporeNanyang Technological University, Singapore

Ph.D. @ , ISI KolkataIndian Statistical Institute, Kolkata

$ echo "$RESEARCH_INTERESTS"

Research interests

symmetric-key cipher design

cryptanalysis (classical & automated)

quantum cryptanalysis

real-world protocols_

./aether --encrypt
round 01/12encrypting…
$ wc -l ~/research/*
17 journal papers
7 conference papers
6 ciphers co-designed
12 talks
$ cat about.txt

About

I am a Research Fellow at Nanyang Technological University (NTU), Singapore, working on symmetric-key cryptography. Before NTU, I was a Program-Specific Researcher at Kyoto University and a postdoctoral researcher at the University of Hyogo, Japan. I received my Ph.D. in Computer Science from the Indian Statistical Institute, Kolkata, with a thesis on cryptanalysis of symmetric-key schemes using classical and quantum techniques.

I design ciphers (low-latency, high-throughput and post-quantum), break them (yoyo, boomerang, differential, division-property and fault attacks, often with MILP/SAT tools), study them against quantum adversaries, and look at how they behave inside real-world protocols, such as key commitment in AEAD.

$ ls -l ~/ciphers/

Ciphers I co-designed

drwxr-xr-xAETHER/TCHES 2025 ★ award drwxr-xr-xDialga/ToSC 2025 drwxr-xr-xMSX/CiC 2025 drwxr-xr-xGleeok/TCHES 2024 drwxr-xr-xASURA/INDOCRYPT 2024 drwxr-xr-xGhidle/ACISP 2023
$ tail -n 7 news.log

News

  • [2026-07] Research visit to Prof. Takanori Isobe, The University of Osaka: design of a post-quantum wide block cipher.
  • [2025-12] Invited talks at the Crypto Winter School 2025 and the National Workshop on Cryptology, IIT Bhilai.
  • [2025-10] Joined Nanyang Technological University, Singapore as a Research Fellow.
  • [2025] ★ AETHER received the Excellent Paper Award at the Computer Security Symposium 2025.
  • [2025] Dialga in IACR ToSC; MSX and SHA instructions for AES-based schemes in IACR CiC; Twinkle cryptanalysis at SAC 2025.
  • [2025] Joined the editorial board of IACR Communications in Cryptology.
  • [2025-05] Joined Kyoto University as a Program-Specific Researcher.
$ cat selected_papers.txt

Selected publications

  • ToSC 2025(4) Journal Dialga: A Family of Low-Latency Tweakable Block Ciphers Using Multiple Linear Layers Subhadeep Banik, Tatsuya Ishikawa, Takanori Isobe, Ryoma Ito, Kazuhiko Minematsu, Kazuma Nakata, Mostafizar Rahman, Kosei Sakamoto
    IACR Transactions on Symmetric Cryptology, 2025(4), pp. 70–124, 2025.
    DOI Scholar
  • TCHES 2025(2) Journal ★ Award AETHER: An Ultra-High Throughput and Low Energy Authenticated Encryption Scheme Subhadeep Banik, Andrea Caforio, Tatsuya Ishikawa, Takanori Isobe, Mostafizar Rahman, Kosei Sakamoto
    IACR Transactions on Cryptographic Hardware and Embedded Systems, 2025(2), pp. 705–742, 2025.
    ★ Excellent Paper Award, Computer Security Symposium 2025
    DOI Scholar
  • ToSC 2024(1) Journal Key Committing Attacks against AES-based AEAD Schemes Patrick Derbez, Pierre-Alain Fouque, Takanori Isobe, Mostafizar Rahman, André Schrottenloher
    IACR Transactions on Symmetric Cryptology, 2024(1), pp. 135–157, 2024.
    DOI Scholar
  • TCHES 2024(2) Journal Gleeok: A Family of Low-Latency PRFs and its Applications to Authenticated Encryption Ravi Anand, Subhadeep Banik, Andrea Caforio, Tatsuya Ishikawa, Takanori Isobe, Fukang Liu, Kazuhiko Minematsu, Mostafizar Rahman, Kosei Sakamoto
    IACR Transactions on Cryptographic Hardware and Embedded Systems, 2024(2), pp. 545–587, 2024.
    DOI Scholar
  • ToSC 2021(3) Journal Boomeyong: Embedding Yoyo within Boomerang and its Applications to Key Recovery Attacks on AES and Pholkos Mostafizar Rahman, Dhiman Saha, Goutam Paul
    IACR Transactions on Symmetric Cryptology, 2021(3), pp. 137–169, 2021.
    DOI Scholar

$ ls publications/  → All 25 publications

$ mail mrahman454@gmail.com_

Contact

Email: mrahman454@gmail.com

Open to collaborations on cipher design, cryptanalysis and research visits.