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Passwordless authentication
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.
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Application · Account
Account.
Your keys, your identity.
Identity, recovery and audit
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Capabilities
What the Account surface gives you.
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3-of-5 social recovery
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.
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Audit trail
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.
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Protection
Security for Account.
Content in Account is inside the end-to-end encrypted envelope: it is encrypted in your browser before it is transmitted, and the server stores ciphertext it holds no key for.
01
Post-quantum cryptography by default
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.
02
End-to-end encryption on your device
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.
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The server holds ciphertext it cannot open
For Account content the server only ever stores ciphertext and public keys. It cannot decrypt your data — by architecture, not by promise: there is no backdoor, no master key and no key escrow, because no key that would open it ever reaches the server.
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Your keys stay on your device
Your private keys are derived in your browser from three secrets only you control, and are held in memory for the session only — never written to browser storage, never sent to the server. A new device derives the same keys locally from the same three secrets.
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Mechanics
How Account works.
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Open Account in your browser
UltimaOS runs in any modern browser — Chrome, Firefox, Safari, Edge. Nothing to install. Sign in by re-entering the three secrets your keys are derived from, and the same keys are rebuilt locally on whatever device you are using.
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Your data is encrypted before it leaves your device
Sending a message, uploading a file, writing a note — the content is encrypted with XChaCha20-Poly1305 and authenticated with an ML-DSA-65 signature before any byte crosses the network boundary.
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The server stores ciphertext and returns it on demand
The server keeps an opaque blob it has no key for. When you open Account, those blobs are streamed to your device, decrypted locally and rendered. Plaintext exists only in your tab.
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Changes follow you across devices
Any change you make is uploaded and picked up by every other device you are signed in on, so Account looks the same wherever you open it.
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Inside the suite
How Account fits in the suite.
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uChat
Account is the single sign-on surface for Chat. Sign out of Account and every app signs out.
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uMail
Mail authenticates with the same Account key. Passphrase never leaves the device.
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Files
Files, Account and recovery all use the same private key. Lose the device, recover with 3-of-5.
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uAI
The AI provider and per-slot configuration live in Account. App-specific AI settings override the defaults.
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Get started
Get started with Account.
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Open Account in your browser
UltimaOS runs in Chrome, Firefox, Safari and Edge. Nothing to install. Sign in with your passphrase to derive your private key locally.
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Open the workspace and launch Account
The launcher shows every app. Account is right there with its capsule video preview. Click to open.
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Connect it with the rest of the suite
Account works alone, but it shines when combined with the rest of the UltimaOS apps. Same identity, same workspace, one place to work.
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Frequently asked
Questions about Account.
Is Account end-to-end encrypted?
Short answer
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.
What cryptography does Account use?
Short answer
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, and HKDF-SHA256 for key derivation.
Can I use Account on multiple devices?
Short answer
Yes. Sign in on any device by re-entering your three secrets and the same keys are derived locally, so your Account content follows you. Changes sync live across all signed-in devices.
Is Account GDPR-compliant?
Short answer
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.
How much does Account cost?
Short answer
UltimaOS is free for individuals and families — permanently, not as a trial. Organizations pay per seat once early access ends, and that is what funds the free accounts. There is no per-app add-on.
Can I export my Account data?
Short answer
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.
What happens if I lose both my device and my passphrase?
Short answer
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.
Is there a way to log in without a passphrase?
Short answer
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.