Develop algorithms, he keeps passwords fearless about quantum computing threats.

“The cryptography algorithms now used, especially the public key cryptography algorithm, risk being cracked after the advent of quantum computers. We are trying to develop some new cryptographic algorithms that will still be available for use after the advent of quantum computers, without fear of quantum computing threats. Speaking of “post-quantum cipher”, Liu Zhe, a professor and doctoral tutor at nanjing University of Aeronautics and Astronautics’ School of Computer Science and Technology, spoke fast.

Develop algorithms, he keeps passwords fearless about quantum computing threats.

0 and 1, two simple to the ultimate number, built by them to build the world of passwords, is now almost the whole of Liu Zhe’s life.

In recent years, Liu Zhe for the first time can resist quantum attack of the grid cryptography algorithm, applied to embedded chip, and put forward a lightweight strategy to resist side channel attack, for China to design the next generation of Internet of Things-appropriate password algorithm provides a practical basis.

Not long ago, Alibaba Damo Academy announced the winners of the 2nd Green Orange Award. Liu Zhe won the medal with his achievements in cryptography and systems.

At first, even the boot was at war.

In September 2004, Liu Zhe was admitted to Shandong University with excellent results. For children in the countryside, computers are a rarity, and Liu Zhe has not seen them a few times, but driven by a strong curiosity, he chose computer and software engineering majors.

For the computer this new thing, Liu Zhe at first a little angry, “at first even turn on the war.”

2004 was a special year for the field of Chinese cryptography. This year, Shandong University professor and academician of the Chinese Academy of Sciences Wang Xiaoyun cracked the internationally renowned cryptographic algorithm MD5, which planted the seeds of cryptography in the mind of 18-year-old Liu Zhe.

“This research has rocked the entire cryptography community, and for the first time cryptography has really come into my field of vision, it’s like ‘set the puzzle’ and ‘guessing’, it’s as entertaining.” Liu Zhe has since become fascinated by the world of cryptography, he began to make up the knowledge of cryptography, learning obscure formulas, and four years later when studying in the direction of cryptography, and then went to the University of Luxembourg to study for a doctorate.

In recent years, with the rise of Internet of Things technology, Internet of Things security has become a research hotspot in the field of cyberspace security.

How to improve the security of IoT chips? In 2014, Liu Zhe designed a lightweight MoTE elliptical curve algorithm for IoT chips and designed, implemented, and opened up a password library based on the curve.

MoTE curve algorithm is superior to the existing elliptical curve algorithm for IoT chips in many ways. “MoTE elliptical curve can protect data more efficiently and energy-efficiently on resource-constrained IoT chips, and ensure the security of IoT devices, while also providing a practical basis for the design of password algorithms suitable for the Internet of Things in China.” Liu Zhe said.

Build a moat for the code of the quantum age

There is no accurate prediction of when quantum computers will emerge, but many scholars believe that quantum computing could pose a threat to cybersecurity if preventive measures are not taken. Another direction of Liu Zhe’s research is to design cryptographic algorithms that can be used in the quantum age, known as post-quantum cryptography algorithms.

“When you first come into contact with post-quantum passwords, it’s hard to find algorithms to implement, especially on embedded devices such as wireless sensing points, smart cards, mobile phones, and so on. The difficulty lies in the poor computing performance of embedded device processors, the relatively small memory, and the later quantum cryptography algorithm requires large rind. Liu Zhe said.

Later, after reading a lot of literature, Liu Zhe used the structural characteristics of the processor, reconstructed the algorithm, designed a new running process, reduced the number of data exchangebetween memory and processor, in order to improve the speed of computing, reduce memory consumption, and for the first time efficiently implementthe grid code that can resist quantum attacks on embedded chips. The result ingested paper was presented at the International Conference on Cryptographic Hardware and Embedded Systems (CHES), the top conference in the field of cryptographic engineering.

Liu said the research has been included in the annual report of the European Union Horizon 2020 project and has been confirmed by a number of international cryptographers.

After returning home, Liu Zhe, in cooperation with researchers from the National Key Laboratory of Information Security of the Institute of Information Engineering of the Chinese Academy of Sciences, realized the independently designed grid cryptography algorithm LAC on various embedded chips, providing important support for LAC cryptography algorithms to participate in the international competition for cryptographic standards.

have questioned their scientific ability

Liu Zhe’s path to scientific research has not been plain sailing. He admitted that his first academic paper had been rejected three times, before and after a year to be published. “I was full of questions about myself at that time, and I wondered if I was fit to read Bo. “

At the time, He was mentored by Keane Sebastian Colon, a professor at the University of Luxembourg, who understood that the temporary lack of recognition of the paper did not mean that scientific research was not recognized.

Since then, Liu Zhe has maintained a 12-hour,6-day-a-week work schedule, often getting up in the middle of the night to write papers. In the end, he graduated with the only outstanding doctoral thesis awarded by the National Natural Science Foundation of Luxembourg, and became the first Chinese to receive the award.

Facing the challenges of the quantum computing era and the needs of the Internet of Everything, Liu Zhe hopes to design a post-quantum cryptography algorithm with good security, excellent performance and small amount of code, and promote the development of post-quantum cryptographic algorithm standards in China.

In recent years, Liu Zhe has led the cyberspace security team of Nanjing University of Aeronautics and Astronautics to make a series of outstanding research achievements in the fields of cryptographic engineering, Internet of Things security, blockchain technology, artificial intelligence security, etc., and won the best paper award three times at the International Security Conference. In the future, he hopes to apply his research to the national grid, industrial control networks and other fields.

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