Documentation Index
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User recovery enables users to decrypt their own encrypted values locally without MPC participation.
How It Works
With dual encryption:
- FHE ciphertext: For homomorphic computation
- User ciphertext: For local recovery (X25519)
Setting Up UserCrypto
let keypair = Keypair::new();
let user_crypto = UserCrypto::from_keypair(&keypair)?;
const keypair = Keypair.generate();
const userCrypto = privora.userCrypto(keypair);
Encrypting with Recovery
let encrypted = encryptor.encrypt(100u8)?;
let with_recovery = user_crypto.add_recovery(encrypted, &100u8.to_le_bytes())?;
let hash = privora.submit(&with_recovery).await?;
const encrypted = privora.encrypt(100, 'u8').withUserRecovery(userCrypto);
const hash = await privora.submit(encrypted);
Decrypting Locally
let recovery = encrypted.user_recovery().unwrap();
let plaintext = user_crypto.decrypt_recovery(recovery)?;
let value = u8::from_le_bytes(plaintext.try_into().unwrap());
if (encrypted.userRecovery) {
const bytes = userCrypto.decryptRecovery(encrypted.userRecovery);
const value = new DataView(bytes.buffer).getUint8(0);
}
Decrypting MPC Results
let plaintext = user_crypto.decrypt_from_mpc(
&result.ciphertext,
&result.nonce,
&result.ephemeral_pubkey,
)?;
When to Use Recovery
| Use Case | Use Recovery? |
|---|
| User’s own balance | Yes |
| User’s order details | Yes |
| Counterparty data | No |
| System-generated values | No |
