SECAI Core · phase 4 of 15 · noun
Data in use
Information that is present in the volatile memory of a host, such as system memory or cache.
The Explain card
- Plain English
- Data in use is information sitting in a host's volatile memory, such as RAM or cache, while it is being actively processed.
- Example
- During inference, a model's weights and a user's prompt sit decrypted in GPU and system memory. A memory dump from a compromised host captures both.
- Why it matters
- Encryption at rest and in transit does not protect data while it is being processed. Confidential computing and memory isolation are how you defend models and prompts at this stage.
- Hook
- Locks on the safe do not help while the jewels are on the table.
Word knowledge
How the word is built, where it came from, and what it sits beside in memory.
In a sentence
On the inference host, a trusted execution environment encrypts data in use so the hypervisor cannot dump plaintext model weights from DRAM.
Why these words
- data Latin data, things given, plural of datum supplies the head noun, the records the phrase locates in a state
- in Old English in, in or into the locative hinge, so those records sit in a state rather than in a category
- use Latin usus, a using, from uti, to use names the employed state the locative points to
Where it came from
- Origin
- English security collocation from Latin data (things given, plural of datum), Old English in, and Latin usus (a using, from uti, to use)
- Entered the language
- 2000s
- What changed
- Data had meant things given, then premises in an argument, then machine-held records. Use had meant a custom, then the employment of a tool, then a state of being employed rather than idle. Security writing of the 2000s joined the three words to name records while a processor is working them, beside data at rest and data in transit.
How it is spelled
- Pattern
- data stays the Latin plural of datum, even when English treats it as a mass noun
- Pattern
- silent e after a single consonant keeps the vowel long in use
- Breaks the pattern
- the noun phrase stays three words; hyphens appear only when the stack modifies another noun
- Breaks the pattern
- data looks plural but computing English often treats it as a mass noun
- Breaks the pattern
- the noun use is /ju:s/ while the verb is /ju:z/, spelled alike
Spelled like
- database
- metadata
- usage
- reuse
Broken into chunks
-
data
- datum
- metadata
- database
-
use
- usage
- reuse
- useful
What it sits beside
Same subject
Same shape
- data in transit
- data at rest
- equipment in use
- building in use
Data-state family
- data in transit
- data at rest
Data compounds
In-use labels
- equipment in use
- building in use
Where it sits in the deck
Phase 4: Data Integrity, Governance, and Provenance
Once you know what data is, learn the principles that keep it trustworthy, traceable, and minimized throughout its lifecycle.
