July 2023 Vol. 21 No. 772023

https://www.ntt-review.jp/archive/2023/202307.html

View from the Top
Riaki Hoshino, Senior Executive Vice President, NTTEAST

Front-line Researchers

View from the Top

Riaki Hoshino, Senior Executive Vice President, NTT EAST

▼Abstract

NTT EAST strives to connect with the communities in which it operates and to build
circular communities that can develop sustainably. This initiative has beenaccompanied by efforts for further strengthening the resilience of
telecommunication networks to counter new threats such as escalating natural
disasters and increasingly sophisticated cyber-attacks, and improving itscrisis-management and mobility capabilities to provide a high-quality and stabletelecommunication infrastructure. We asked Riaki Hoshino, senior executive vicepresident of NTT EAST, about the company’s initiatives and his beliefs as a topexecutive.

Hirokazu Kameoka, Senior Distinguished Researcher,
NTT Communication Science Laboratories

Feature Articles
The Forefront of Cryptography Research with an Eye on the Quantum Era

Rising Researchers

Development of Modern Cryptography and Research on
Quantum Cryptography

Special Report
Commemoration of the Japan Prize
Keeping in Mind the Spirit Acquired at NTT Laboratories,
We Will Continue to Challenge Ourselves to Contributeto the Development of Humankind

Feature Articles
The Forefront of Cryptography Research with an Eye on
the Quantum Era
Development of Modern Cryptography and Research on Quantum Cryptography
Functional Encryption Enabling Secure Leasing of Private Keys
Quantum Algorithms with Potential for New Applications
Security of Hash Functions against Attacks Using Quantum Computers

Regular Articles
MagneShape: A Simple Pin-based Shape-changing Display Using Magnetic Materials

Global Standardization Activities
Efforts by TM Forum, an Operation Standards Organization▼AbstractThe foundation of modern cryptography developedin 1976 considered security by modelingadversaries as polynomial-time Turing machines.
However, recent advances in developing ageneral-purpose quantum computer have made asignificant impact on modern cryptography because
it overturns the security model. NTT’s research on
cryptography aims to provide technologies toensure the security of modern information systems
and create applications when quantum computers
become widespread. This article reviews the 40
years of cryptologic research at NTT and outlines
our current efforts.

Practice

Users vs. Adversary
Classical computersModern crypto(Research level)

Kentaro Yasu, Distinguished Researcher, NTT
Communication Science Laboratories

Quantum computers
VS.
Post-quantum crypto
VS.
Quantum crypto
VS.

Foundation

Diffie–Hellman
key exchange (1976)

PresentGeneral-purpose
quantum computer?

Regular Articles

MagneShape: A Simple Pin-based Shape-changing Display
Using Magnetic Materials▼Abstract
Pin-based shape-changing displays provide dynamic shape changes by
actuating numerous pins. However, the large number of actuators required tomove so many pins complicates the electrical path and mechanical structure,and creates a need for significant resources if one is to build such a display.
Therefore, my research colleague and I proposed a simple pin-based
shape-changing display, called MagneShape, that outputs shapes and motions
without any electronic components. MagneShape consists of magnetic pins, apin housing, and magnetic sheet. The magnetic force generated between themagnetic sheet and the magnetic pins levitates the pins vertically. We devised
two methods for fabricating alternative magnetic pins, devised a method forcontrolling the magnetic pins, and developed design tools for MagneShape.

Magneticpin

Housing

Magnetic sheet
Magnetized pattern