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Verification register Security & Identity

Readiness verdict

Signal PQXDH (Post-Quantum Extended Diffie-Hellman)

A dated reading of what is claimed, reported, and independently verified in the current evidence.

As of
2026-08-20
Revision
1
Method
v1.3.0

Current reading

Readiness band and full integer triple

AI-assisted assembly · derived results

Readiness band

Mature

Primary summary from verified readiness

Confidence
58% · stale
Computed at
2026-08-20T10:56:13.109097+00:00
Claimed
100

Public ambition and stated capability

Reported
90

Observed practitioner reporting

Verified
79

Independently supported evidence

Gap
+21

Claimed leads verified

Evidence strength Growing

Decision

What the current evidence supports

Human editorial judgment · 2026-08-20

Adopt with guardrails

Why
Real-world deployment across Signal's user base since Sept 2023, independent machine-checked formal verification (USENIX Security 2024), and a documented post-launch spec hardening cycle demonstrate the hybrid approach is production-grade for key agreement, while its own spec and Signal's later SPQR work disclose exactly where its guarantees stop.
Next
Treat the X25519+Kyber-1024 hybrid key-agreement pattern as a validated reference when specifying our own E2EE or protocol handshakes; explicitly scope any adoption to key-agreement only (not full-session quantum resistance) and track Signal's Triple Ratchet/SPQR successor plus NIST ML-KEM (FIPS 203) finalization for the fuller pattern.

Constraints

Blockers

No named blocker is present in the current public projection.

Evidence summary

Derived counts

AI-assisted assembly

Total
5
Tier 1
0
Tier 2
3
Tier 3
2
Supports
2
Contradicts
2
Context
1
Latest observed
2025-10-24

Counts and dates only. Raw signals, private excerpts, trust records, and internal corpus material are not published here.

Publication record

Revisions

Initial public reading

  1. 2026-08-20 Reading moved from mature to mature.

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