Suppliers
Questions to ask your AI suppliers about data
Most organisations use AI through a supplier, so a supplier's weakness becomes yours. The NCSC tells leaders to understand their supply chains and ask the right questions.
Last reviewed against legislation.gov.uk, National Cyber Security Centre and OWASP GenAI Security Project. Sources

Why it matters
Your data, their systems
The NCSC says leaders should understand their data, model and machine learning software supply chains, and that developers of AI models and systems should take responsibility for the security outcomes their customers rely on, because customers usually lack the expertise to address AI-specific risks [3]. The ChatGPT incident began in an open-source library the service depended on [7].
The questions
Group them by topic
Storage and retention
Where is our data stored, for how long, and can we delete it? Samsung's memo described data on external AI servers as hard to retrieve or delete [8].
Training use
Is our data used to train models, and can we opt out? OWASP lists the ability to opt out of training as good practice [4].
Access
Who at the supplier can read our prompts and outputs, and how is access controlled and logged?
Incident notification
How and how fast will you tell us about an incident? UK GDPR's 72 hour clock runs from the controller's awareness [1], so late notice from a supplier shortens your window.
Secure development
Do you follow recognised guidance? The NCSC's guidelines, developed with CISA and agencies from other countries, cover secure design, development, deployment and operation [2].
Contract points
What to look for
Check these as well:
- Whether the supplier acts as your processor for personal data
- Notification terms for incidents and sub-processor changes
- Deletion on request and at the end of the contract
- Whether your data is used for training by default
- Where the data is processed

Next
Put it into practice
Send the questions to each AI supplier and file the answers with your incident plan. Use what to do this week to track the rest.
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