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Documents authored by Iwata, Tetsu

Document
DOI: 10.4230/DagRep.8.1.1
Symmetric Cryptography (Dagstuhl Seminar 18021)

Authors: Joan Daemen, Tetsu Iwata, Nils Gregor Leander, and Kaisa Nyberg

Published in: Dagstuhl Reports, Volume 8, Issue 1 (2018)

Abstract
This report documents the program and the outcomes of Dagstuhl Seminar 18021 "Symmetric Cryptography", which was held on January 7-12, 2018 in Schloss Dagstuhl - Leibniz Center for Informatics. The seminar was the sixth in a series of Dagstuhl seminars on "Symmetric Cryptography", previously held in 2007, 2009, 2012, 2014, and 2016. During the seminar, many of the participants presented their current research in the design, analysis, and application of symmetric cryptographic algorithms, including ongoing work and open problems. This report documents the abstracts or extended abstracts of the talks presented during the seminar, as well as summaries of the discussion sessions.
Cite as

Joan Daemen, Tetsu Iwata, Nils Gregor Leander, and Kaisa Nyberg. Symmetric Cryptography (Dagstuhl Seminar 18021). In Dagstuhl Reports, Volume 8, Issue 1, pp. 1-32, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

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@Article{daemen_et_al:DagRep.8.1.1,
  author =	{Daemen, Joan and Iwata, Tetsu and Leander, Nils Gregor and Nyberg, Kaisa},
  title =	{{Symmetric Cryptography (Dagstuhl Seminar 18021)}},
  pages =	{1--32},
  journal =	{Dagstuhl Reports},
  ISSN =	{2192-5283},
  year =	{2018},
  volume =	{8},
  number =	{1},
  editor =	{Daemen, Joan and Iwata, Tetsu and Leander, Nils Gregor and Nyberg, Kaisa},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagRep.8.1.1},
  URN =		{urn:nbn:de:0030-drops-92832},
  doi =		{10.4230/DagRep.8.1.1},
  annote =	{Keywords: symmetric cryptography, cryptanalysis, authenticated encryption, cryptography for IoT, mass surveillance}
}
Document
DOI: 10.4230/DagRep.6.1.34
Symmetric Cryptography (Dagstuhl Seminar 16021)

Authors: Frederik Armknecht, Tetsu Iwata, Kaisa Nyberg, and Bart Preneel

Published in: Dagstuhl Reports, Volume 6, Issue 1 (2016)

Abstract
From 10.01.2016 to 15.01.2016, the Seminar 16021 in Symmetric Cryptography was held in Schloss Dagstuhl-Leibniz Center for Informatics. It was the fifth in the series of the Dagstuhl seminars "Symmetric Cryptography" held in 2007, 2009, 2012, and 2014. During the seminar, several participants presented their current research, and ongoing work and open problems were discussed. Abstracts of the presentations were given during the seminar. The first section describes the seminar topics and goals in general.
Cite as

Frederik Armknecht, Tetsu Iwata, Kaisa Nyberg, and Bart Preneel. Symmetric Cryptography (Dagstuhl Seminar 16021). In Dagstuhl Reports, Volume 6, Issue 1, pp. 34-54, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2016)

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@Article{armknecht_et_al:DagRep.6.1.34,
  author =	{Armknecht, Frederik and Iwata, Tetsu and Nyberg, Kaisa and Preneel, Bart},
  title =	{{Symmetric Cryptography (Dagstuhl Seminar 16021)}},
  pages =	{34--54},
  journal =	{Dagstuhl Reports},
  ISSN =	{2192-5283},
  year =	{2016},
  volume =	{6},
  number =	{1},
  editor =	{Armknecht, Frederik and Iwata, Tetsu and Nyberg, Kaisa and Preneel, Bart},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagRep.6.1.34},
  URN =		{urn:nbn:de:0030-drops-58088},
  doi =		{10.4230/DagRep.6.1.34},
  annote =	{Keywords: authenticity, block ciphers, confidentiality, cryptanalysis, hash functions, integrity, lightweight cryptography, provable security, stream ciphers}
}
Document
DOI: 10.4230/DagRep.4.1.1
Symmetric Cryptography (Dagstuhl Seminar 14021)

Authors: Frederik Armknecht, Helena Handschuh, Tetsu Iwata, and Bart Preneel

Published in: Dagstuhl Reports, Volume 4, Issue 1 (2014)

Abstract
From 05.01.2014 to 10.01.2014, the Seminar 14021 in Symmetric Cryptography was held in Schloss Dagstuhl -- Leibniz Center for Informatics. During the seminar, several participants presented their current research, and ongoing work and open problems were discussed. Abstracts of the presentations given during the seminar as well as abstracts of seminar results and ideas are put together in this paper. The first section describes the seminar topics and goals in general. Links to extended abstracts or full papers are provided, if available.
Cite as

Frederik Armknecht, Helena Handschuh, Tetsu Iwata, and Bart Preneel. Symmetric Cryptography (Dagstuhl Seminar 14021). In Dagstuhl Reports, Volume 4, Issue 1, pp. 1-16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2014)

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@Article{armknecht_et_al:DagRep.4.1.1,
  author =	{Armknecht, Frederik and Handschuh, Helena and Iwata, Tetsu and Preneel, Bart},
  title =	{{Symmetric Cryptography (Dagstuhl Seminar 14021)}},
  pages =	{1--16},
  journal =	{Dagstuhl Reports},
  ISSN =	{2192-5283},
  year =	{2014},
  volume =	{4},
  number =	{1},
  editor =	{Armknecht, Frederik and Handschuh, Helena and Iwata, Tetsu and Preneel, Bart},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagRep.4.1.1},
  URN =		{urn:nbn:de:0030-drops-45150},
  doi =		{10.4230/DagRep.4.1.1},
  annote =	{Keywords: Authenticity, Integrity, Privacy,Hash Functions, Block Ciphers, Provable Security, Cryptanalysis}
}
Document
DOI: 10.4230/DagSemProc.07021.10
Tightness of the Security Bound of CENC

Authors: Tetsu Iwata

Published in: Dagstuhl Seminar Proceedings, Volume 7021, Symmetric Cryptography (2007)

Abstract
This talk presents an overview of recently developed encryption mode for blockciphers, called CENC. CENC has the following advantages: (1) beyond the birthday bound security, (2) security proofs with the standard PRP assumption, (3) highly efficient, (4) single blockcipher key, (5) fully parallelizable, (6) allows precomputation of keystream, and (7) allows random access. Then we discuss the tightness of its security bound, and give a partial answer to the open problem posed at FSE 2006.
Cite as

Tetsu Iwata. Tightness of the Security Bound of CENC. In Symmetric Cryptography. Dagstuhl Seminar Proceedings, Volume 7021, pp. 1-6, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2007)

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@InProceedings{iwata:DagSemProc.07021.10,
  author =	{Iwata, Tetsu},
  title =	{{Tightness of the Security Bound of CENC}},
  booktitle =	{Symmetric Cryptography},
  pages =	{1--6},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2007},
  volume =	{7021},
  editor =	{Eli Biham and Helena Handschuh and Stefan Lucks and Vincent Rijmen},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.07021.10},
  URN =		{urn:nbn:de:0030-drops-10169},
  doi =		{10.4230/DagSemProc.07021.10},
  annote =	{Keywords: Encryption mode, blockcipher, CENC, provable security}
}
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