Identity, recovery and audit
Identity is bound to your encryption keys, not to a password. No password database to leak. ML-DSA-65 signature on a server-issued challenge is the authentication step.
Account fits naturally into this flow.
Lose both device and passphrase and you can still recover your encrypted history, provided three of your five designated trustees cooperate. No central authority can break the scheme.
Account fits naturally into this flow.
Every authentication, every key-rotation, every recovery attempt is logged to your encrypted audit stream. You can inspect your own audit trail; only you can.
Account fits naturally into this flow.
Every UltimaOS app shares the same post-quantum cryptographic stack, so the security properties below apply uniformly. App-specific considerations are noted where they apply.
All authentication and key exchange uses NIST-standardized ML-DSA-65 (FIPS 204) signatures and ML-KEM-768 (FIPS 203) key encapsulation. There is zero RSA, zero elliptic-curve, zero classical-only crypto in the authentication path. Defeats store-now-decrypt-later attacks.
Every payload is encrypted in your browser using XChaCha20-Poly1305 (RFC 8439) with a 192-bit nonce and a Poly1305 authentication tag. The plaintext exists only in your tab's memory. When you close the tab, the plaintext is gone.
The UltimaOS server only ever stores ciphertext and public keys. We cannot read your data — by design, not by promise. There is no encryption backdoor, no master key, no key escrow.
Your private key is derived from your passphrase using Argon2id with high parameters. New devices derive the same key locally and can decrypt your entire history. The passphrase is never sent to the server — it is verified by an ML-DSA-65 signature on a server-issued challenge.
UltimaOS runs in any modern browser — Chrome, Firefox, Safari, Edge. Nothing to install. Sign in with your passphrase-derived key, or restore from a 3-of-5 social recovery if you are on a new device.
Every action — sending a message, uploading a file, creating a task, scheduling an event — is encrypted with XChaCha20-Poly1305 and authenticated with an ML-DSA-65 signature before any byte crosses the network boundary.
The UltimaOS server keeps an opaque blob per account and per conversation. When you open Account, the encrypted blobs are streamed to your device, decrypted locally, and rendered. The server never sees plaintext.
Any change you make is encrypted and uploaded; every other device you are signed in on pulls the new ciphertext and decrypts it. Live multi-device sync, with the cryptography guarantee that only your devices can read it.
Account is the single sign-on surface for Chat. Sign out of Account and every app signs out.
Mail authenticates with the same Account key. Passphrase never leaves the device.
Files, Account and recovery all use the same private key. Lose the device, recover with 3-of-5.
The AI provider and per-slot configuration live in Account. App-specific AI settings override the defaults.
UltimaOS runs in Chrome, Firefox, Safari and Edge. Nothing to install. Sign in with your passphrase to derive your private key locally.
The launcher shows every app. Account is right there with its capsule video preview. Click to open.
Account works alone, but it shines when combined with the rest of the UltimaOS apps. Same private key, same encryption, one workspace.
Yes. All content in Account is encrypted in your browser using XChaCha20-Poly1305 with a fresh key per item. The UltimaOS server only ever stores ciphertext and public keys — it cannot decrypt your data, no matter who asks.
Account uses the same post-quantum stack as every other UltimaOS app: ML-DSA-65 (FIPS 204) for authentication, ML-KEM-768 (FIPS 203) for key encapsulation, XChaCha20-Poly1305 (RFC 8439) for symmetric encryption, HKDF-SHA256 for key derivation, and Argon2id for passphrase hashing.
Yes. Sign in on any device with your passphrase and the same private key is derived locally. All your Account content is then decrypted from the encrypted blobs the server returns. Changes sync live across all signed-in devices.
Yes. UltimaOS is built and operated in the European Union by an EU company. The architecture is GDPR-compliant by design — encrypted data, EU-only infrastructure, no US CLOUD Act exposure, no advertising, no third-party trackers. See the GDPR page for the full breakdown.
During early access, UltimaOS is free for individuals and organizations. After early access, pricing will be per-seat with accessible family tiers and per-organization plans for businesses. There is no per-app add-on.
Yes. UltimaOS supports encrypted export of all your content for backup and portability. The export is encrypted to a key you control; you can store it on your own infrastructure or in a personal encrypted backup.
Account uses a 3-of-5 social recovery scheme. If you have designated five recovery trustees (typically close contacts or yourself across multiple devices), three of them can cooperatively regenerate your private key. No central authority can break the scheme.
No — by design. The passphrase is the only thing that derives your private key. If you want a faster sign-in on a personal device, you can enable device-level biometric unlock, which still gates access behind the same key material.