In a distributed denial-of-service attack (DDoS attack), the incoming traffic flooding the victim originates from many different sources. This effectively makes it impossible to stop the attack simply by blocking a single source.
A DoS or DDoS attack is analogous to a group of people crowding the entry door of a shop, making it hard for legitimate customers to enter, thus disrupting trade.
Criminal perpetrators of DoS attacks often target sites or services hosted on high-profile
This section needs expansion. You can help by adding to it. (July 2017)
Court testimony shows that the first demonstration of DoS attack was made by Khan C. Smith in 1997 during a
On March 5, 2018, an unnamed customer of the US-based service provider
During the Hong Kong anti-extradition protests in June 2019, the messaging app Telegram was subject to a DDoS attack, aimed at preventing protesters from using it to coordinate movements. The founders of Telegram have stated that this attack appears to be that of a "State sized actor" via IP addresses originating in China.