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SHA-256 Digital Fingerprint

This page explains how EV424 uses SHA-256 as a re-verifiable fingerprint. It checks same / different only.

Before / After

NO HASH vs SHA-256 (mobile view stacked for readability)

NO HASH vs SHA-256 Mobile view: stacked for readability Process difference that reduces re-check loops (time & cost) NO HASH manual / repeated PROCESS FILE A CHECK ? re-check loop FILE B TIME LONG repeated checks COST HIGH manual effort WITH SHA-256 deterministic / one-pass PROCESS FILE A FILE B SHA-256 SHA-256 COMPARE RESULT ✓ SAME | ✗ DIFF VERIFIED (re-checkable) TIME SHORT one-pass compare COST LOW automated proof SHA-256 does not prevent tampering. It makes changes detectable and re-verifiable.
Before: repeated manual checks → ambiguity → re-check loops (time & cost ↑).
After: hash → compare → same/different result → re-verifiable proof (time & cost ↓).
SHA-256 does not prove “truth.” It only proves whether bytes are identical (match) or not (mismatch), and enables re-verification.
Accuracy(4)=Truth(2)=Life(4)