Send messages with
Post-Quantum Encryption
Onion Mail integrates with PQC Server — a platform for quantum-resistant encrypted messaging and secure file storage. Your communications are protected not just today, but from tomorrow's quantum computers.
The quantum threat is already here
Today's encryption — the kind that protects your emails, bank transfers, and messages — relies on mathematical problems that classical computers cannot solve in a reasonable time. Quantum computers change that equation entirely.
⚠️ "Harvest Now, Decrypt Later"
Intelligence agencies and sophisticated actors are intercepting and storing your encrypted communications today — even though they can't read them yet. Once a sufficiently powerful quantum computer exists, everything they've collected becomes readable. Messages you send today could be decrypted in the future. Post-quantum encryption closes this window permanently.
A complete platform for quantum-safe communications
PQC Server is not just a chat tool. It is a full platform for generating keys, encrypting messages, and storing files — all protected by post-quantum algorithms.
Encrypted messaging
Send a message to any user. It is encrypted with post-quantum algorithms — only the recipient can decrypt and read it.
PQC key generation
Create and manage your own post-quantum key pairs directly on the platform — no technical knowledge required.
Encrypt & decrypt
Encrypt any text or file before sending it, or decrypt messages you receive from other users using your private key.
Encrypted file storage
Use PQC Server as a secure drive to store your files — accessible only with your private key, no third party can read them.
From your mailbox to a secure message in 4 steps
The widget is already built into your Onion Mail inbox. You don't need a separate app or account to get started.
Click the PQC button in your mailbox
The widget opens a secure popup directly inside your Onion Mail session — no new tab, no separate login.
Enter the recipient's username
Type the PQC Server username of the person you want to contact. Their public key is retrieved automatically.
Message encrypted client-side
Your message is encrypted with post-quantum algorithms before leaving your browser. The server never sees the plaintext.
Share the short URL via email
A short URL is generated. Paste it in an email to your recipient — they open it and decrypt with their private key.
Anyone whose data needs to stay private for years
If the information you send today could still be sensitive in 5 or 10 years, post-quantum encryption is not optional — it is necessary.
Journalists & activists
Communicate with sources without leaving a readable trace, even years after the fact.
Legal & medical
Share sensitive documents that must remain confidential for decades.
Business
Protect contracts, intellectual property, and financial data from future interception.
Privacy-conscious users
Anyone who doesn't want their private communications stored and eventually decrypted.
Your mailbox is already quantum-ready
The PQC widget is live inside your inbox. Or visit PQC Server directly to create your account and generate your first post-quantum key pair.