# J.W\.E.

#### Représentation d’un contenu chiffré

```javascript
{
    // Integrity protected header but not encrypted!
    "protected": "eyJlbmMiOiJBMTI4Q0JDLUhTMjU2In0",
    "unprotected": {"jku":"https://server.example.com/keys.jwks"},
    "recipients":[
        {
            // Key and Alg hints.
            "header": {"alg":"RSA1_5","kid":"123"},
            // Encryption key encrypted using 123's public key.
            "encrypted_key": "UGhIOguC7IuEvf_N...XMR4gp_A"
        },
        {
            "header": {"alg":"A128KW","kid":"456"},
            "encrypted_key": "6KB707dM9YTIgHt...2IlrT1oOQ"
        }
    ],
    "iv": "AxY8DCtDaGlsbGljb3RoZQ",
    // Encrypted message.
    "ciphertext": "KDlTtXchhZTGufMYmO...4HffxPSUrfmqCHXaI9wOGY",
    // AEAD authentication tag.
    "tag": "Mz-VPPyU4RlcuYv1IwIvzw"
}
```

{% hint style="info" %}
Le chiffrement asymétrique a une taille limite de message *(modulo – padding)*. C’est pour cette raison que l’on génère une clé symétrique à la volée qui est ensuite chiffrée avec la clé publique asymétrique.
{% endhint %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://guide-api-rest.marmicode.fr/securite-des-apis-rest/j.o.s.e./j.w.e..md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.