Comments from Takeuchi of Macnica networks Security Research Center were published in the Nihon Keizai Shimbun (April 21, 2021).

Media name: Nihon Keizai Shimbun
Publication date: April 20, 2021 electronic version, 21st morning edition
Article title: “Large-scale cyberattacks exploit weaknesses of companies, urgent need for defensive measures”
https://www.nikkei.com/article/DGXZQOUE204CI0Q1A420C2000000/
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