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## Sealed boxes
> **See also**: [Libsodium's documentation on its sealed boxes features](https://download.libsodium.org/doc/public-key_cryptography/sealed_boxes).
### crypto_box_seal
Anonymous public-key encryption. (Message integrity is still assured.)
**Parameters and their respective types**:
1. `{string|Buffer}` plaintext
2. `{X25519PublicKey}` public key
Returns a `Promise` that resolves to a `Buffer`.
### crypto_box_seal_open
Anonymous public-key decryption. (Message integrity is still assured.)
**Parameters and their respective types**:
1. `{Buffer}` ciphertext
2. `{X25519PublicKey}` public key
3. `{X25519SecretKey}` secret key
Returns a `Promise` that resolves to a `Buffer`.
### Example for crypto_box_seal
```javascript
const { SodiumPlus } = require('sodium-plus');
let sodium;
(async function () {
if (!sodium) sodium = await SodiumPlus.auto();
let aliceKeypair = await sodium.crypto_box_keypair();
let aliceSecret = await sodium.crypto_box_secretkey(aliceKeypair);
let alicePublic = await sodium.crypto_box_publickey(aliceKeypair);
let plaintext = 'Your message goes here';
let ciphertext = await sodium.crypto_box_seal(plaintext, alicePublic);
console.log(ciphertext);
let decrypted = await sodium.crypto_box_seal_open(ciphertext, alicePublic, aliceSecret);
console.log(decrypted.toString());
})();
```
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