Faculty Profiles - IWATA Tetsu

Papers - IWATA Tetsu

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How to improve interpolation attack Reviewed

Kaoru Kurosawa, Tetsu Iwata and Quang Viet Duong

IEICE Trans. Fundamentals Vol. Vol. E88-A ( No. 1 ) page： 9-15 2005.1

On the security of a MAC by Mitchell Reviewed

Tetsu Iwata and Kaoru Kurosawa

IEICE Trans. Fundamentals Vol. Vol. E88-A ( No. 1 ) page： 25-32 2005.1

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

OMAC is a provably secure MAC scheme proposed by Iwata and Kurosawa. In August 2003, Mitchell published a note "On the security of XCBC, TMAC and OMAC" to propose a new variant of OMAC, which we call OMAC1". In this paper, we prove that OMAC1" is less secure than the original OMAC. We show a security gap between them. As a result, we obtain a negative answer to Mitchell's open question, i.e., OMAC1" is not provably secure even if the underlying block cipher is a PRP.

DOI： 10.1093/ietfec/E88-A.1.25

How to re-use round function in super-pseudorandom permutation Reviewed

Tetsu Iwata and Kaoru Kurosawa

The 9th Australasian Conference on Information Security and Privacy, ACISP 2004, Lecture Notes in Computer Science, Springer ( LNCS 3108 ) page： 224-235 2004.6

On the correctness of security proofs for the 3GPP confidentiality and integrity algorithms Reviewed

Tetsu Iwata and Kaoru Kurosawa

IEICE Trans. Fundamentals Vol. Vol. E87-A ( No. 5 ) page： 1110-1118 2004.5

On the pseudorandomness of KASUMI type permutations Reviewed

Tetsu Iwata, Tohru Yagi and Kaoru Kurosawa

IEICE Trans. Fundamentals Vol. Vol. E87-A ( No. 5 ) page： 1098-1109 2004.5

New covering radius of Reed-Muller codes for t-resilient functions Reviewed

Kaoru Kurosawa, Tetsu Iwata and Takayuki Yoshiwara

IEEE Trans. Inform. Theory Vol. Vol. 50 ( No. 3 ) page： 468-475 2004.3

New security proofs for the 3GPP confidentiality and integrity algorithms Reviewed

Tetsu Iwata and Tadayoshi Kohno

Fast Software Encryption, FSE 2004, Lecture Notes in Computer Science, Springer ( LNCS 3017 ) page： 427-445 2004.2

On the universal hash functions in Luby-Rackoff cipher Reviewed

Tetsu Iwata and Kaoru Kurosawa

IEICE Trans. Fundamentals Vol. Vol. E87-A ( No. 1 ) page： 60-66 2004.1

TMAC: Two-Key CBC MAC Reviewed

Kaoru Kurosawa and Tetsu Iwata

IEICE Trans. Fundamentals Vol. Vol. E87-A ( No. 1 ) page： 46-53 2004.1

Stronger security bounds for OMAC, TMAC and XCBC Reviewed

Tetsu Iwata and Kaoru Kurosawa

Progress in Cryptology, INDOCRYPT 2003, Lecture Notes in Computer Science, Springer ( LNCS 2904 ) page： 402-415 2003.12

Authorship：Lead author Language：English

OMAC, TMAC and XCBC are CBC-type MAC schemes which are provably secure for arbitrary message length. In this paper, we present a more tight upper bound on Adv for each scheme, where Adv denotes the maximum success (forgery) probability of adversaries. Our bounds are expressed in terms of the total length of all queries of an adversary to the MAC generation oracle while the previous bounds are expressed in terms of the maximum length of each query. In particular, a significant improvement occurs if the lengths of queries are heavily unbalanced.

On the correctness of security proofs for the 3GPP confidentiality and integrity algorithms Reviewed

Tetsu Iwata and Kaoru Kurosawa

Cryptography and Coding, Ninth IMA International Conference, Lecture Notes in Computer Science, Springer ( LNCS 2898 ) page： 427-445 2003.12

On the security of a new variant of OMAC Reviewed

Tetsu Iwata and Kaoru Kurosawa

The 6th Annual International Conference on Information Security and Cryptology, ICISC 2003, Lecture Notes in Computer Science, Springer ( LNCS 2971 ) page： 67-78 2003.11

Non-cryptographic primitive for pseudorandom permutation Reviewed

Tetsu Iwata, Tomonobu Yoshino and Kaoru Kurosawa

Theoretical Computer Science Vol. Vol. 306 ( 1-3 ) page： 139-154 2003.9

On the pseudorandomness of KASUMI type permutations Reviewed

Tetsu Iwata, Tohru Yagi and Kaoru Kurosawa

The 8th Australasian Conference on Information Security and Privacy, ACISP 2003, Lecture Notes in Computer Science, Springer ( LNCS 2727 ) page： 130-141 2003.6

TMAC: Two-Key CBC MAC Reviewed

Kaoru Kurosawa and Tetsu Iwata

Topics in Cryptology, CT-RSA 2003, Lecture Notes in Computer Science, Springer ( LNCS 2612 ) page： 33-49 2003.4

*OMAC: One-Key CBC MAC Reviewed

Tetsu Iwata and Kaoru Kurosawa

Fast Software Encryption, FSE 2003, Lecture Notes in Computer Science, Springer ( LNCS 2887 ) page： 129-153 2003.2

Inclusion relations of Boolean functions satisfying PC(l) of order k Reviewed

Tetsu Iwata and Kaoru Kurosawa

IEICE Trans. Fundamentals Vol. Vol. E86-A ( No. 1 ) page： 47-53 2003.1

On the universal hash functions in Luby-Rackoff cipher Reviewed

Tetsu Iwata and Kaoru Kurosawa

The 5th Annual International Conference on Information Security and Cryptology, ICISC 2002, Lecture Notes in Computer Science, Springer ( LNCS 2578 ) page： 226-236 2002.11

Non-cryptographic primitive for pseudorandom permutation Reviewed

Tetsu Iwata, Tomonobu Yoshino and Kaoru Kurosawa

Fast Software Encryption, FSE 2002, Lecture Notes in Computer Science, Springer ( LNCS 2365 ) page： 149-163 2002.2

Round security and super-pseudorandomness of MISTY type structure Reviewed

Tetsu Iwata, Tomonobu Yoshino, Tomohiro Yuasa and Kaoru Kurosawa

IEICE Trans. Fundamentals Vol. Vol. E85-A ( No. 1 ) page： 2-10 2002.1

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