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https://he1m4n6a.github.io
2. Red blue confrontation.
https://www.secpulse.com/archives/107194.html
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https://www.cnblogs.com/he1m4n6a/p/10057473.html
4. Practice drill: Green Alliance Technology red blue confrontation service.
http://www.ijiandao.com/2b/baijia/184585.html
5. Wang, D.: Teaching reform of computer network security course. Chin. Foreign Entrepreneurs 6, 35–36 (2019)