In 2020, the number of detected Distributed Denial-of-Service (DDoS) attacks and responses to those attacks by South Korea's Internet and Security Agency totaled about *** cases, down from about *** the previous year. Following large-scale cyberattacks on South Korea in 2009, which included DDoS attacks on websites of the Blue House and major government agencies, South Korea established a "DDoS shelter" to mitigate DDoS attacks.
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Korean Internet & Security Agency. (May 10, 2021). Number of detected Distributed Denial-of-Service (DDoS) attacks and government responses in South Korea from 2009 to 2020 [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 29, 2026, from /statistics/1252632/south-korea-number-of-ddos-attacks-and-responses/
Korean Internet & Security Agency. "Number of detected Distributed Denial-of-Service (DDoS) attacks and government responses in South Korea from 2009 to 2020." Chart. May 10, 2021. ÌÇÐÄÆƽâ°æ. Accessed July 29, 2026. /statistics/1252632/south-korea-number-of-ddos-attacks-and-responses/
Korean Internet & Security Agency. (2021). Number of detected Distributed Denial-of-Service (DDoS) attacks and government responses in South Korea from 2009 to 2020. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 29, 2026. /statistics/1252632/south-korea-number-of-ddos-attacks-and-responses/
Korean Internet & Security Agency. "Number of Detected Distributed Denial-of-service (Ddos) Attacks and Government Responses in South Korea from 2009 to 2020." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 10 May 2021, /statistics/1252632/south-korea-number-of-ddos-attacks-and-responses/
Korean Internet & Security Agency, Number of detected Distributed Denial-of-Service (DDoS) attacks and government responses in South Korea from 2009 to 2020 ÌÇÐÄÆƽâ°æ, /statistics/1252632/south-korea-number-of-ddos-attacks-and-responses/ (last visited July 29, 2026)
Number of detected Distributed Denial-of-Service (DDoS) attacks and government responses in South Korea from 2009 to 2020 [Graph], Korean Internet & Security Agency, May 10, 2021. [Online]. Available: /statistics/1252632/south-korea-number-of-ddos-attacks-and-responses/
