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Tentative Mk4 entropy model

otaliptus-technical

https://x.com/otaliptus/status/2083365327740543404

Captured screenshot of the post by @otaliptus, posted 1 Aug 2026, 01:32 UTC
@otaliptus posted captured full-size capture → original post →
Author
@otaliptus
Organisation
independent
Evidence role
independent-analysis
Posted
Capture status
capture held

A deliberately tentative independent Mk4 model. Assuming a remote attacker does not know the UID, otaliptus estimates about 20 to 21 bits from the wafer-coordinate word, narrows practical SysTick positions, and isolates the unresolved RTC term. The post reports roughly 52 to 63 bits if Mk4 RTC behaviour is problematic and roughly 75 to 88 bits if it is not. The author labels this brainstorming and lists assumptions that may be wrong, so it is preserved as reported analysis rather than a measured bound.

This post is registered as evidence and has a locally held capture. The original remains the canonical publication.

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