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

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

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How it works

KyberCrypt workflow: 1) sender uploads a file addressed to a username; 2) it's encrypted with ML-KEM + AES-256-GCM, sealed to the recipient's public key; 3) the server stores ciphertext only and can't read it; 4) the recipient authenticates with 2FA and decrypts; 5) the file is deleted after download.

Post-quantum by default

ML-KEM-768 key encapsulation with AES-256-GCM — protection against tomorrow's quantum attacks, on every transfer.

Sealed to the recipient

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

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.

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Free plan includes 2 GB transfers — see plans.