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 Skeptic
The security page names its cryptography — OpenPGP with Curve25519 and 256-bit AES-GCM — and states plainly that usernames, web addresses and notes are all encrypted, which is more than most "zero knowledge" pages will admit, with open-source clients and a public bug bounty besides. But we found no public information on key derivation, no named independent audit or certification with a date, and no disclosed incident history — for a vendor staked entirely on trust, silence on audits is itself an answer. 3 5 7