Editing Denial-of-service attack (section)

===Challenge Collapsar (CC) attack===
A Challenge Collapsar (CC) attack is an attack where standard HTTP requests are sent to a targeted web server frequently. The [[Uniform Resource Identifier]]s (URIs) in the requests require complicated time-consuming algorithms or database operations which may exhaust the resources of the targeted web server.<ref>{{cite web|url=https://support.huaweicloud.com/en-us/antiddos_faq/antiddos_01_0020.html|title=What Is a CC Attack?|website=HUAWEI CLOUD-Grow With Intelligence|language=en|access-date=2019-03-05|url-status=live|archive-url=https://web.archive.org/web/20190305080627/https://support.huaweicloud.com/en-us/antiddos_faq/antiddos_01_0020.html|archive-date=2019-03-05}}</ref><ref>{{cite web|url=https://patents.google.com/patent/CN106161451A/en|author=刘鹏|author2=郭洋|title=CC (challenge collapsar) attack defending method, device and system|website=Google Patents|language=en|access-date=2018-03-05|url-status=live|archive-url=https://web.archive.org/web/20190305080850/https://patents.google.com/patent/CN106161451A/en|archive-date=2019-03-05}}</ref><ref>{{cite web|url=https://patents.google.com/patent/CN106330911A/en|author=曾宪力|author2=史伟|author3=关志来|author4=彭国柱|title=CC (Challenge Collapsar) attack protection method and device|website=Google Patents|language=en|access-date=2018-03-05|url-status=live|archive-url=https://web.archive.org/web/20190305081050/https://patents.google.com/patent/CN106330911A/en|archive-date=2019-03-05}}</ref> In 2004, a Chinese hacker nicknamed KiKi invented a hacking tool to send these kinds of requests to attack a NSFOCUS firewall named Collapsar, and thus the hacking tool was known as Challenge Collapsar, or ''CC'' for short. Consequently, this type of attack got the name ''CC attack''.<ref>{{cite web|url=http://digi.163.com/14/0724/19/A1UL2O95001618JV.html|title=史上最臭名昭著的黑客工具 CC的前世今生|language=zh-hans|website=NetEase|publisher=驱动中国网(北京)|date=2014-07-24|access-date=2019-03-05|url-status=dead|archive-url=https://web.archive.org/web/20190305080935/http://digi.163.com/14/0724/19/A1UL2O95001618JV.html|archive-date=2019-03-05}}</ref>