One link. One opening. No readable residue.
Create a private note or attach a file; the recipient opens it once, then the encrypted blob is removed.
Zero-knowledge sharing for sensitive work
Private information should not become platform data.
classified gives teams a clean way to send notes and files that encrypt in the browser, open once, and leave no readable copy for servers, logs, or AI systems.
MAIN OÜ cannot read the note or file you send.
Your content is never available as training or prompt text.
- 1Encrypt in browser
- 2Share the private link
- 3Delete after first read
The guarantee
Not readable by us. Not fed to AI. Not in any log.
Zero-knowledge isn't a setting you toggle — it's the architecture. Here is exactly why your content stays yours.
Not readable by us
Encryption happens in your browser with AES-256-GCM. The decryption key rides inside the link fragment and never reaches our servers — we hold only an unreadable blob.
Never fed to AI
There is nothing for a model to ingest. Because servers only ever see ciphertext, your content can't be indexed, mined, or used to train an LLM — ours or anyone else's.
Never in a log
We never receive your note, your file names, or your key — so there's nothing readable to record. Shares are ephemeral and purged the moment they're opened.
How it works
Four steps. The key never leaves your link.
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Write
Type a note or drop a file. Everything stays inside your browser.
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Encrypt
Your browser seals it with AES-256-GCM. The key lives only in the link fragment.
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Share
Send the one-time link — optionally guarded by a password sent over a separate channel.
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Self-destruct
The recipient reveals it once; the server returns the blob and deletes it in the same step.
Full detail in our how-it-works & FAQ, or go deeper in the guides — plain-English explainers on encryption, zero-knowledge design, and sending secrets safely. See also our privacy policy and terms of service.