KyberCrypt — Post-quantum encrypted file transfer

Encrypted file transfer, built for the post-quantum era.

KyberCrypt seals every file to the recipient with hybrid post-quantum cryptography<br>(ML-KEM-768 + X25519, AES-256-GCM). The server stores only ciphertext , and each<br>file is permanently deleted the moment it's downloaded .

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How it works

Hybrid post-quantum by default

Every transfer is sealed with ML-KEM-768 and X25519 combined — the same belt-and-suspenders approach used by TLS and Signal. An attacker has to break both algorithms, not one.

Your password stays in your browser

Login keys are derived locally with Argon2id and only the derived proof is sent — your password itself never reaches our servers, and stored records can't be replayed as credentials.

Sealed to the recipient

Files are encrypted to the recipient's public keys. The server keeps only ciphertext — at rest, your data isn't readable.

Zero-knowledge file requests

Maximum-privacy request links encrypt in the uploader's browser, with the recipient's key pinned into the link itself — we receive ciphertext we cannot read, sealed to a key we cannot swap.

Burn after download

Each file is deleted the instant the recipient downloads it. Nothing lingers on the server.

Accounts, 2FA & an API

Send by username, lock your account with TOTP two-factor, and automate transfers with scoped API keys.

Ready to send something private?

Create an account<br>Free plan includes 2 GB transfers — see plans.

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