Denial-of-service attacks are characterized by an explicit attempt by attackers to prevent legitimate use of a service. The scale of DoS attacks has continued to rise over recent years, with recent attacks exceeding a terabit per second. In June 2019, the Hong Kong anti-extradition protests, the messaging app Telegram was subject to a DWS attack.
About Denial-of-service attack in brief
Denial-of-service attacks are characterized by an explicit attempt by attackers to prevent legitimate use of a service. The most serious attacks are distributed. Multiple machines can generate more attack traffic than one machine. Multiple attack machines are harder to turn off than one attack machine, and that the behavior of each attack machine can be stealthier, making it harder to track and shut down. An application-layer DDoS attack is a form of DDoS where attackers target specific functions or features of a website with the intention to disable those features. DDoS attacks are often used against financial institutions and security personnel to distract IT security personnel from security breaches. The scale of DoS attacks has continued to rise over recent years, with recent attacks exceeding a terabit per second. In February 2020, Amazon Web Services experienced attack with peak volume 2. 3 terabits per second, while Wikipedia was taken down by a DDoS on September 6 and 7, 2019. The founders of Telegram have stated that this attack appears to be that of a \”State sized actor\” via IP addresses originating in China. In 2013, research by Akamai Technologies found that 20% of all DDoS Attacks have been over-exercises of the application layer, with the most common type of attack being a denial of service (DDoS) over the application- Layer 1 attack is different from an entire network attack, and is often used by financial institutions to distract their IT security staff from security breach. The attack was carried out by a group of people crowding the entry door of a shop making it hard for legitimate customers to enter, thus disrupting trade.
Some common examples are UDP flooding, SYN flooding and DNS and DNS amplification. In a distributed denial- of-service attack, the incoming traffic flooding the victim originates from many different sources. It may be impossible to stop the attack simply by using ingress filtering. It also makes it difficult to distinguish legitimate user traffic from attack traffic when spread across multiple points of origin. As an alternative or augmentation of a DoS attack, attacks may involve forging of IP sender addresses, further complicating identifying and defeating the attack. In June 2019, the Hong Kong anti-extradition protests, the messaging app Telegram was subject to a DWS attack, aimed at preventing protesters from using it to coordinate movements. In September 2018, Wikipedia was attacked with peak volumes of 1.7 terabit per second and 1.35 terabbit per second in some parts of Europe. The attacks were carried out in response to the anti-terror protests in Hong Kong and in the aftermath of the Charlie Hebdo terror attacks in Paris. The attackers were believed to be based in China, with some claiming to be linked to a state-run news agency, the Xinhua news agency and the Chinese Ministry of Foreign Affairs. In March 2018, an unnamed customer of the US-based service provider Arbor Networks fell victim to the largest DDoS in history, reaching a peak of about 1. 7 terabinds per second; the previous record was set a few days earlier, on March 1, 2018, when GitHub was hit by an attack of 1, 35 terabinding perSecond.