Tetsu Iwata

According to our database, Tetsu Iwata authored at least 103 papers between 1998 and 2026.

Collaborative distances:

• Dijkstra number of four.
• Erdős number of three.

2026

Practical committing attacks against Rocca-S.

Ryunosuke Takeuchi, Yosuke Todo, Tetsu Iwata

Inf. Process. Lett., 2026

2025

A Note on Feedback-PRF Mode of KDF from NIST SP 800-108.

Ritam Bhaumik, Avijit Dutta, Tetsu Iwata, Ashwin Jha, Kazuhiko Minematsu, Mridul Nandi, Yu Sasaki, Meltem Sönmez Turan, Stefano Tessaro

IACR Cryptol. ePrint Arch., 2025

Type-2 Generalized Feistel Structures Based on Tweakable Block Ciphers, Reconsidered.

Kento Tsuji, Tetsu Iwata

IACR Commun. Cryptol., 2025

Comprehensive Robustness Analysis of GCM, CCM, and OCB3.

Akiko Inoue, Tetsu Iwata, Kazuhiko Minematsu

Proceedings of the Topics in Cryptology - CT-RSA 2025, 2025

Cryptographic Treatment of Key Control Security - In Light of NIST SP 800-108.

Ritam Bhaumik, Avijit Dutta, Akiko Inoue, Tetsu Iwata, Ashwin Jha, Kazuhiko Minematsu, Mridul Nandi, Yu Sasaki, Meltem Sönmez Turan, Stefano Tessaro

Proceedings of the Advances in Cryptology - CRYPTO 2025, 2025

Poster: An Improved Quantum Attack on the Two-round Even-Mansour Cipher with Independent Permutations and Keys.

Rentaro Shiba, Tetsu Iwata

Proceedings of the 2025 ACM SIGSAC Conference on Computer and Communications Security, 2025

2024

Key Recovery, Universal Forgery, and Committing Attacks against Revised Rocca: How Finalization Affects Security.

Ryunouchi Takeuchi, Yosuke Todo, Tetsu Iwata

IACR Trans. Symmetric Cryptol., 2024

2023

Key Committing Security of AEZ and More.

Yu Long Chen, Antonio Flórez-Gutiérrez, Akiko Inoue, Ryoma Ito, Tetsu Iwata, Kazuhiko Minematsu, Nicky Mouha, Yusuke Naito, Ferdinand Sibleyras, Yosuke Todo

IACR Trans. Symmetric Cryptol., 2023

PMACrx: A Vector-Input MAC for High-Dimensional Vectors with BBB Security.

Isamu Furuya, Hayato Kasahara, Akiko Inoue, Kazuhiko Minematsu, Tetsu Iwata

Proceedings of the Advances in Information and Computer Security, 2023

Feistel Ciphers Based on a Single Primitive.

Kento Tsuji, Tetsu Iwata

Proceedings of the Cryptography and Coding - 19th IMA International Conference, 2023

2022

Generalized Feistel Structures Based on Tweakable Block Ciphers.

Kazuki Nakaya, Tetsu Iwata

IACR Trans. Symmetric Cryptol., 2022

Cryptanalysis of Rocca and Feasibility of Its Security Claim.

Akinori Hosoyamada, Akiko Inoue, Ryoma Ito, Tetsu Iwata, Kazuhiko Minematsu, Ferdinand Sibleyras, Yosuke Todo

IACR Trans. Symmetric Cryptol., 2022

Quantum attacks on Sum of Even-Mansour pseudorandom functions.

Kazuo Shinagawa, Tetsu Iwata

Inf. Process. Lett., 2022

On the (im)possibility of improving the round diffusion of generalized Feistel structures.

Kyoji Shibutani, Tetsu Iwata

Inf. Process. Lett., 2022

Matching Attacks on Romulus-M.

Makoto Habu, Kazuhiko Minematsu, Tetsu Iwata

IACR Cryptol. ePrint Arch., 2022

Analyzing the Provable Security Bounds of GIFT-COFB and Photon-Beetle.

Akiko Inoue, Tetsu Iwata, Kazuhiko Minematsu

Proceedings of the Applied Cryptography and Network Security, 2022

2021

New Indifferentiability Security Proof of MDPH Hash Function.

Chun Guo, Tetsu Iwata, Kazuhiko Minematsu

IACR Cryptol. ePrint Arch., 2021

On Tight Quantum Security of HMAC and NMAC in the Quantum Random Oracle Model.

Akinori Hosoyamada, Tetsu Iwata

Proceedings of the Advances in Cryptology - CRYPTO 2021, 2021

2020

Beyond-Birthday-Bound Secure Cryptographic Permutations from Ideal Ciphers with Long Keys.

Ryota Nakamichi, Tetsu Iwata

IACR Trans. Symmetric Cryptol., 2020

Indifferentiability of SKINNY-HASH Internal Functions.

Akinori Hosoyamada, Tetsu Iwata

IACR Cryptol. ePrint Arch., 2020

Provably Quantum-Secure Tweakable Block Ciphers.

Akinori Hosoyamada, Tetsu Iwata

IACR Cryptol. ePrint Arch., 2020

GIFT-COFB.

Subhadeep Banik, Avik Chakraborti, Tetsu Iwata, Kazuhiko Minematsu, Mridul Nandi, Thomas Peyrin, Yu Sasaki, Siang Meng Sim, Yosuke Todo

IACR Cryptol. ePrint Arch., 2020

2019

Iterative Block Ciphers from Tweakable Block Ciphers with Long Tweaks.

Ryota Nakamichi, Tetsu Iwata

IACR Trans. Symmetric Cryptol., 2019

Duel of the Titans: The Romulus and Remus Families of Lightweight AEAD Algorithms.

Tetsu Iwata, Mustafa Khairallah, Kazuhiko Minematsu, Thomas Peyrin

IACR Cryptol. ePrint Arch., 2019

Quantum Distinguishing Attacks against Type-1 Generalized Feistel Ciphers.

Gembu Ito, Tetsu Iwata

IACR Cryptol. ePrint Arch., 2019

Tight Quantum Security Bound of the 4-Round Luby-Rackoff Construction.

Akinori Hosoyamada, Tetsu Iwata

IACR Cryptol. ePrint Arch., 2019

ZOCB and ZOTR: Tweakable Blockcipher Modes for Authenticated Encryption with Full Absorption.

Zhenzhen Bao, Jian Guo, Tetsu Iwata, Kazuhiko Minematsu

IACR Cryptol. ePrint Arch., 2019

Quantum Attacks Against Type-1 Generalized Feistel Ciphers and Applications to CAST-256.

Boyu Ni, Gembu Ito, Xiaoyang Dong, Tetsu Iwata

Proceedings of the Progress in Cryptology - INDOCRYPT 2019, 2019

Universal Forgery and Multiple Forgeries of MergeMAC and Generalized Constructions.

Tetsu Iwata, Virginie Lallemand, Gregor Leander, Yu Sasaki

Proceedings of the Topics in Cryptology - CT-RSA 2019, 2019

Quantum Chosen-Ciphertext Attacks Against Feistel Ciphers.

Gembu Ito, Akinori Hosoyamada, Ryutaroh Matsumoto, Yu Sasaki, Tetsu Iwata

Proceedings of the Topics in Cryptology - CT-RSA 2019, 2019

Cryptanalysis of OCB2: Attacks on Authenticity and Confidentiality.

Akiko Inoue, Tetsu Iwata, Kazuhiko Minematsu, Bertram Poettering

Proceedings of the Advances in Cryptology - CRYPTO 2019, 2019

4-Round Luby-Rackoff Construction is a qPRP.

Akinori Hosoyamada, Tetsu Iwata

Proceedings of the Advances in Cryptology - ASIACRYPT 2019, 2019

2018

Cryptanalysis of AES-PRF and Its Dual.

Patrick Derbez, Tetsu Iwata, Ling Sun, Siwei Sun, Yosuke Todo, Haoyang Wang, Meiqin Wang

IACR Trans. Symmetric Cryptol., 2018

On the Design Rationale of SIMON Block Cipher: Integral Attacks and Impossible Differential Attacks against SIMON Variants.

Kota Kondo, Yu Sasaki, Yosuke Todo, Tetsu Iwata

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2018

Plaintext Recovery Attack of OCB2.

Tetsu Iwata

IACR Cryptol. ePrint Arch., 2018

Symmetric Cryptography (Dagstuhl Seminar 18021).

Joan Daemen, Tetsu Iwata, Nils Gregor Leander, Kaisa Nyberg

Dagstuhl Reports, 2018

2017

On the Security of Schnorr Signatures, DSA, and ElGamal Signatures against Related-Key Attacks.

Hiraku Morita, Jacob C. N. Schuldt, Takahiro Matsuda, Goichiro Hanaoka, Tetsu Iwata

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2017

On the Security of Non-Interactive Key Exchange against Related-Key Attacks.

Hiraku Morita, Jacob C. N. Schuldt, Takahiro Matsuda, Goichiro Hanaoka, Tetsu Iwata

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2017

Cryptanalysis of PMACx, PMAC2x, and SIVx.

Kazuhiko Minematsu, Tetsu Iwata

IACR Cryptol. ePrint Arch., 2017

Reconsidering the Security Bound of AES-GCM-SIV.

Tetsu Iwata, Yannick Seurin

IACR Cryptol. ePrint Arch., 2017

Analyzing Key Schedule of Simon: Iterative Key Differences and Application to Related-Key Impossible Differentials.

Kota Kondo, Yu Sasaki, Yosuke Todo, Tetsu Iwata

Proceedings of the Advances in Information and Computer Security, 2017

ZMAC: A Fast Tweakable Block Cipher Mode for Highly Secure Message Authentication.

Tetsu Iwata, Kazuhiko Minematsu, Thomas Peyrin, Yannick Seurin

Proceedings of the Advances in Cryptology - CRYPTO 2017, 2017

Blockcipher-Based Authenticated Encryption: How Small Can We Go?

Avik Chakraborti, Tetsu Iwata, Kazuhiko Minematsu, Mridul Nandi

Proceedings of the Cryptographic Hardware and Embedded Systems - CHES 2017, 2017

2016

CENC is Optimally Secure.

Tetsu Iwata, Bart Mennink, Damian Vizár

IACR Cryptol. ePrint Arch., 2016

Stronger Security Variants of GCM-SIV.

Tetsu Iwata, Kazuhiko Minematsu

IACR Cryptol. ePrint Arch., 2016

Symmetric Cryptography (Dagstuhl Seminar 16021).

Frederik Armknecht, Tetsu Iwata, Kaisa Nyberg, Bart Preneel

Dagstuhl Reports, 2016

Integrity Analysis of Authenticated Encryption Based on Stream Ciphers.

Kazuya Imamura, Kazuhiko Minematsu, Tetsu Iwata

Proceedings of the Provable Security, 2016

On the Design Rationale of Simon Block Cipher: Integral Attacks and Impossible Differential Attacks against Simon Variants.

Kota Kondo, Yu Sasaki, Tetsu Iwata

Proceedings of the Applied Cryptography and Network Security, 2016

2015

Optimality of Tweak Functions in CLOC.

Hayato Kobayashi, Kazuhiko Minematsu, Tetsu Iwata

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2015

Tweak-Length Extension for Tweakable Blockciphers.

Kazuhiko Minematsu, Tetsu Iwata

Proceedings of the Cryptography and Coding - 15th IMA International Conference, 2015

On the Security of the Schnorr Signature Scheme and DSA Against Related-Key Attacks.

Hiraku Morita, Jacob C. N. Schuldt, Takahiro Matsuda, Goichiro Hanaoka, Tetsu Iwata

Proceedings of the Information Security and Cryptology - ICISC 2015, 2015

GCM Security Bounds Reconsidered.

Yuichi Niwa, Keisuke Ohashi, Kazuhiko Minematsu, Tetsu Iwata

Proceedings of the Fast Software Encryption - 22nd International Workshop, 2015

2014

Type 1.x Generalized Feistel Structures.

Shingo Yanagihara, Tetsu Iwata

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2014

Cryptanalysis of 249-, 250-, ..., 256-Bit Key HyRAL via Equivalent Keys.

Yuki Asano, Shingo Yanagihara, Tetsu Iwata

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2014

Symmetric Cryptography (Dagstuhl Seminar 14021).

Frederik Armknecht, Helena Handschuh, Tetsu Iwata, Bart Preneel

Dagstuhl Reports, 2014

Impact of ANSI X9.24-1: 2009 Key Check Value on ISO/IEC 9797-1: 2011 MACs.

Tetsu Iwata, Lei Wang

Proceedings of the Fast Software Encryption - 21st International Workshop, 2014

CLOC: Authenticated Encryption for Short Input.

Tetsu Iwata, Kazuhiko Minematsu, Jian Guo, Sumio Morioka

Proceedings of the Fast Software Encryption - 21st International Workshop, 2014

2013

Improving the Permutation Layer of Type 1, Type 3, Source-Heavy, and Target-Heavy Generalized Feistel Structures.

Shingo Yanagihara, Tetsu Iwata

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2013

Improved Authenticity Bound of EAX, and Refinements.

Kazuhiko Minematsu, Stefan Lucks, Tetsu Iwata

Proceedings of the Provable Security - 7th International Conference, 2013

Attacks and Security Proofs of EAX-Prime.

Kazuhiko Minematsu, Stefan Lucks, Hiraku Morita, Tetsu Iwata

Proceedings of the Fast Software Encryption - 20th International Workshop, 2013

2012

Further More on Key Wrapping.

Yasushi Osaki, Tetsu Iwata

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2012

Cryptanalysis of EAXprime.

Kazuhiko Minematsu, Hiraku Morita, Tetsu Iwata

IACR Cryptol. ePrint Arch., 2012

Breaking and Repairing GCM Security Proofs.

Tetsu Iwata, Keisuke Ohashi, Kazuhiko Minematsu

Proceedings of the Advances in Cryptology - CRYPTO 2012, 2012

Cryptanalysis of 256-Bit Key HyRAL via Equivalent Keys.

Yuki Asano, Shingo Yanagihara, Tetsu Iwata

Proceedings of the Applied Cryptography and Network Security, 2012

2011

Security of Hash-then-CBC Key Wrapping Revisited.

Yasushi Osaki, Tetsu Iwata

Proceedings of the Cryptography and Coding - 13th IMA International Conference, 2011

Building Blockcipher from Tweakable Blockcipher: Extending FSE 2009 Proposal.

Kazuhiko Minematsu, Tetsu Iwata

Proceedings of the Cryptography and Coding - 13th IMA International Conference, 2011

On Permutation Layer of Type 1, Source-Heavy, and Target-Heavy Generalized Feistel Structures.

Shingo Yanagihara, Tetsu Iwata

Proceedings of the Cryptology and Network Security - 10th International Conference, 2011

2010

MPP Characteristics of Variants of Merkle-Damgård Iterated Hash Functions.

Shungo Nakamura, Tetsu Iwata

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2010

2009

BTM: A Single-Key, Inverse-Cipher-Free Mode for Deterministic Authenticated Encryption.

Tetsu Iwata, Kan Yasuda

Proceedings of the Selected Areas in Cryptography, 16th Annual International Workshop, 2009

HBS: A Single-Key Mode of Operation for Deterministic Authenticated Encryption.

Tetsu Iwata, Kan Yasuda

Proceedings of the Fast Software Encryption, 16th International Workshop, 2009

2008

Security of the Five-Round Kasumi Type Permutation.

Tetsu Iwata, Tohru Yagi, Kaoru Kurosawa

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2008

Bounds on Fixed Input/Output Length Post-processing Functions for Biased Physical Random Number Generators.

Kyohei Suzuki, Tetsu Iwata

Proceedings of the Selected Areas in Cryptography, 15th International Workshop, SAC 2008, 2008

Tweakable Pseudorandom Permutation from Generalized Feistel Structure.

Atsushi Mitsuda, Tetsu Iwata

Proceedings of the Provable Security, Second International Conference, 2008

Authenticated Encryption Mode for Beyond the Birthday Bound Security.

Tetsu Iwata

Proceedings of the Progress in Cryptology, 2008

2007

How to Construct Super-Pseudorandom Permutations with Short Keys.

Tetsu Iwata, Kaoru Kurosawa

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2007

The 128-Bit Blockcipher CLEFIA (Extended Abstract).

Taizo Shirai, Kyoji Shibutani, Toru Akishita, Shiho Moriai, Tetsu Iwata

Proceedings of the Fast Software Encryption, 14th International Workshop, 2007

Tightness of the Security Bound of CENC.

Tetsu Iwata

Proceedings of the Symmetric Cryptography, 07.01. - 12.01.2007, 2007

2006

The Advanced Encryption Standard-Cipher-based Message Authentication Code-Pseudo-Random Function-128 (AES-CMAC-PRF-128) Algorithm for the Internet Key Exchange Protocol (IKE).

JunHyuk Song, Radha Poovendran, Jicheol Lee, Tetsu Iwata

RFC, August, 2006

The AES-CMAC Algorithm.

JunHyuk Song, Radha Poovendran, Jicheol Lee, Tetsu Iwata

RFC, June, 2006

New Blockcipher Modes of Operation with Beyond the Birthday Bound Security.

Tetsu Iwata

Proceedings of the Fast Software Encryption, 13th International Workshop, 2006

2005

How to Improve Interpolation Attack.

Kaoru Kurosawa, Tetsu Iwata, Quang Viet Duong

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2005

On the Security of a MAC by Mitchell.

Tetsu Iwata, Kaoru Kurosawa

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2005

How to Enhance the Security of the 3GPP Confidentiality and Integrity Algorithms.

Tetsu Iwata, Kaoru Kurosawa

Proceedings of the Fast Software Encryption: 12th International Workshop, 2005

Side Channel Attacks on Message Authentication Codes.

Katsuyuki Okeya, Tetsu Iwata

Proceedings of the Security and Privacy in Ad-hoc and Sensor Networks, 2005

2004

On the Universal Hash Functions in Luby-Rackoff Cipher.

Tetsu Iwata, Kaoru Kurosawa

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2004

New Security Proofs for the 3GPP Confidentiality and Integrity Algorithms.

Tetsu Iwata, Tadayoshi Kohno

Proceedings of the Fast Software Encryption, 11th International Workshop, 2004

How to Re-use Round Function in Super-Pseudorandom Permutation.

Tetsu Iwata, Kaoru Kurosawa

Proceedings of the Information Security and Privacy: 9th Australasian Conference, 2004

2003

Inclusion Relations of Boolean Functions Satisfying PC(<i>l</i>) of Order <i>k</i>.

Tetsu Iwata, Kaoru Kurosawa

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2003

Stronger Security Bounds for OMAC, TMAC, and XCBC.

Tetsu Iwata, Kaoru Kurosawa

Proceedings of the Progress in Cryptology, 2003

On the Correctness of Security Proofs for the 3GPP Confidentiality and Integrity Algorithms.

Tetsu Iwata, Kaoru Kurosawa

Proceedings of the Cryptography and Coding, 2003

On the Security of a New Variant of OMAC.

Tetsu Iwata, Kaoru Kurosawa

Proceedings of the Information Security and Cryptology, 2003

OMAC: One-Key CBC MAC.

Tetsu Iwata, Kaoru Kurosawa

Proceedings of the Fast Software Encryption, 10th International Workshop, 2003

TMAC: Two-Key CBC MAC.

Kaoru Kurosawa, Tetsu Iwata

Proceedings of the Topics in Cryptology, 2003

On the Pseudorandomness of KASUMI Type Permutations.

Tetsu Iwata, Tohru Yagi, Kaoru Kurosawa

Proceedings of the Information Security and Privacy, 8th Australasian Conference, 2003

2002

On the Universal Hash Functionsin Luby-Rackoff Cipher.

Tetsu Iwata, Kaoru Kurosawa

Proceedings of the Information Security and Cryptology, 2002

Non-cryptographic Primitive for Pseudorandom Permutation.

Tetsu Iwata, Tomonobu Yoshino, Kaoru Kurosawa

Proceedings of the Fast Software Encryption, 9th International Workshop, 2002

2001

New Covering Radius of Reed-Muller Codes for t-Resilient Functions.

Tetsu Iwata, Takayuki Yoshiwara, Kaoru Kurosawa

Proceedings of the Selected Areas in Cryptography, 8th Annual International Workshop, 2001

Round Security and Super-Pseudorandomness of MISTY Type Structure.

Tetsu Iwata, Tomonobu Yoshino, Tomohiro Yuasa, Kaoru Kurosawa

Proceedings of the Fast Software Encryption, 8th International Workshop, 2001

2000

Root Finding Interpolation Attack.

Kaoru Kurosawa, Tetsu Iwata, Quang Viet Duong

Proceedings of the Selected Areas in Cryptography, 7th Annual International Workshop, 2000

On the Pseudorandomness of the AES Finalists - RC6 and Serpent.

Tetsu Iwata, Kaoru Kurosawa

Proceedings of the Fast Software Encryption, 7th International Workshop, 2000

1999

On Cryptographically Secure Vectorial Boolean Functions.

Takashi Satoh, Tetsu Iwata, Kaoru Kurosawa

Proceedings of the Advances in Cryptology, 1999

Probabilistic Higher Order Differential Attack and Higher Order Bent Functions.

Tetsu Iwata, Kaoru Kurosawa

Proceedings of the Advances in Cryptology, 1999

1998

Inclusion Relations of Boolean Functions Satisfying PC(l) of Order k.

Tetsu Iwata, Kaoru Kurosawa

Proceedings of the Sequences and their Applications, 1998