Encryption model & independent audits
How this is scored
What the vendor can prove about its security design: end-to-end encryption with named algorithms and key derivation, which fields are encrypted on the device and which are not, independent audits and penetration tests with published results, a bug bounty, and incident history disclosed.
0 — Security described in adjectives ("bank-grade", "military encryption") with no architecture, no audit and no statement of what the vendor can read.
3 — Encryption algorithms named and "zero knowledge" claimed, but no whitepaper, no statement of which fields stay unencrypted, and audits mentioned without dates, auditors or results.
5 — A published security whitepaper naming algorithms, key derivation and the client-side encryption model, a stated list of what is and is not encrypted (including URLs and metadata), and a named independent audit or certification (ISO 27001, SOC 2) with its date.
8 — Recurring independent penetration tests or code audits with reports or summaries published, a public bug bounty or vulnerability disclosure policy, past security incidents documented with their impact, and open-source clients or cryptography that can be reviewed.
10 — The design is verifiable end to end: full source or cryptographic design public, every field encrypted client-side including metadata, audits by named firms repeated yearly with full reports, a threat model that states what a compromise of the vendor's servers would expose, and incident post-mortems published.
The CISO
The security pages describe OpenPGP end-to-end encryption with client-side key handling and critical operations done in the browser extension, and the vendor publishes a Cure53 white-box penetration test and source-code audit of its integration components with per-vulnerability fix versions and even a won't-fix item, alongside a bug bounty and one-hundred-percent open-source code I can have my own people review. I hold the mark back from the top because the security whitepaper is described as distributed to customers rather than posted publicly, the captured pages give no date for that audit, and no page states which fields — URLs and metadata included — are encrypted on the device and which are not. 5 6 7 1