Grokking Modern Mobile System Design Interview
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Threat Model and Secure Storage
A threat model describes what must be protected, what an attacker can do, and which controls reduce the risk.
“Encrypt the data” is not a complete threat model. A stolen locked phone, an intercepted connection, and a modified app are different situations.
Connect each threat to a control
| Asset | Threat | Useful control | Remaining limit |
|---|---|---|---|
| Refresh credential | Extraction from app files | Protected secret storage or encryption key | A compromised running process may still misuse access |
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