Device A holds your key
Private
—
Plaintext on this device. Nothing has left yet.
Your key — scan on Device B This QR is shown device-to-device. It never touches the cloud.
Multi-device · QR key transfer · blind relay
Carry your crown jewels to a second device.
The same encrypted private card is sealed on Device A, relayed as ciphertext through the cloud, and decrypted on Device B — but only after the key crosses over by QR. The relay never holds the key. Ciphertext alone is useless.
- 1 · Seal on A
- 2 · Relay ciphertext
- 3 · Pull on B
- 4 · Transfer key (QR)
- 5 · Decrypt on B
empty — nothing relayed yet
Device B no key yet
Private
—
Nothing here yet. Pull the ciphertext the relay is holding.