Lesson 2 of 9 · 15 min read
Secure Boot, Measured Boot and Remote Attestation in Depth
Secure boot enforces: each stage runs the next only if it is signed and not revoked. Measured boot records: each stage extends a hash into a TPM register, blocking nothing by itself. Attestation proves that record to a remote verifier with a fresh nonce. A patched but still-signed boot component stays usable until it is revoked, which is why BlackLotus worked. PCR values break on every update, so policies use event logs or signatures. Confidential AI uses the same chain to release model weights only to attested machines.
free sign-in, no card required
Practise it as an interviewer asks it
What do Play Integrity and App Attest actually prove, and how do you build a backend that uses them correctly?Design encryption and key custody for high-value model weights.How is certificate pinning bypassed on a device the tester controls, what does that prove, and how do apps and backends resist?What do confidential computing and attestation actually buy you for model inference?How do hardware-backed keys work on Android and iOS, what does key attestation prove, and why must biometrics unlock a key, not a boolean?How does rooting an Android device actually work, what does it change in the boot chain, and how can apps and servers tell?