SECAI Core · phase 11 of 15 · noun
Denial of service attack
Any type of physical, application, or network attack that affects the availability of a managed resource.
The Explain card
- Plain English
- A denial of service attack is any physical, application, or network action that degrades or removes the availability of a managed resource.
- Example
- An attacker sends a steady stream of enormous prompts to an LLM API endpoint. Each request hogs GPU time and memory, so genuine users see timeouts even though the server is technically up.
- Why it matters
- AI inference is expensive per request, which makes it an easy target. Rate limits, token caps, and request queuing are availability controls, not just cost controls.
- Hook
- Make it so busy with nonsense that it cannot do its job.
Word knowledge
How the word is built, where it came from, and what it sits beside in memory.
In a sentence
Engineers traced the denial of service attack to thousands of compromised cameras sending repeated connection requests to the web server.
Why these words
- denial Middle English denial, from deny plus -al turns the verb deny into the noun that begins the modifying phrase
- of Old English of, from or away from links denial to the thing involved
- service Old French servise, from Latin servitium, servitude or duty identifies the technical function associated with denial
- attack French attaque, from Italian attaccare, to join battle serves as the head noun and classifies the phrase as an attack name
Where it came from
- Origin
- English technical compound formed from denial, of, service, and attack
- Entered the language
- 20th century
- What changed
- Denial moved from general refusal to the nonreceipt of a technical service, while attack acquired a specialized cybersecurity use.
How it is spelled
- Pattern
- In denial, the final y of deny changes to i before the suffix -al.
- Pattern
- In the supplied open form, all four elements are written as separate lowercase words.
- Breaks the pattern
- Technical publications also commonly use the hyphenated attributive spelling denial-of-service attack.
Spelled like
- trial
- burial
Broken into chunks
-
deni-al
- trial
- burial
-
serv-ice
- serve
- servant
-
attack
- attacker
- counterattack
What it sits beside
Same subject
- distributed denial of service attack
- botnet
- rate limiting
- traffic filtering
Same shape
- quality of service
- proof of concept
- breach of contract
traffic-based attack forms
- SYN flood
- UDP flood
- HTTP flood
Where it sits in the deck
Phase 11: Threat Landscape: Attack Vectors and Adversarial Techniques
With defences named, learn what they must defend against — the full catalogue of attack techniques targeting AI systems, their inputs, outputs, training pipelines, and supply chains.
