> For the complete documentation index, see [llms.txt](https://gl-docs.gitbook.io/zkpass/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gl-docs.gitbook.io/zkpass/zkpass-developers-guide/api-reference/restful-api/utilities/encrypt-user-data-and-dvr.md). # Encrypt User Data and DVR ## Prerequisites Make sure you have : 1. `userDataToken` 2. `dvrToken` Read [Sign User Data and DVR](https://docs.ssi.id/zkpass/v/zkpass-developers-guide/api-reference/restful-api/generate-proof/sign-user-data-and-dvr) section for detail info. ## Overview zkPass enhances the security of your data during transport by encrypting it before sending it over the network. The are only two entities that can access the data: the **holder** and **zkPass host** running in a Trusted Execution Environment (TEE). ## Example Implementation First, find the zkPass public key in the `.well-known/jwks.json` file at this endpoint: The key you're looking for has a kid (Key ID) of "ServiceEncryptionPubK". 
import { importSPKI, EncryptJWT } from "jose";

async encryptData(userDataOrDvrToken: string): Promise<string> {
    const keyUrl = 'https://playground-zkpass.ssi.id/.well-known/jwks.json';
    const fetchKeys = await fetch(keyUrl);
    const keys = await fetchKeys.json();
    const encryptionPubKey = keys.find(
      (key: { kid: string }) => key.kid === 'ServiceEncryptionPubK'
    );
    const zkPassPublicKey =
      '-----BEGIN PUBLIC KEY-----\n' +
      encryptionPubKey.x +
      '\n' +
      encryptionPubKey.y +
      '\n-----END PUBLIC KEY-----';
    const importedPublicKey = await importSPKI(zkPassPublicKey, "ES256");
    return await new EncryptJWT({ data: userDataOrDvrToken })
      .setProtectedHeader({
        alg: "ECDH-ES",
        enc: "A256GCM",
      })
      .encrypt(importedPublicKey);
  }
## Output Example After this section you should have : 1. **Encrypted User Data Token (in JWE Format)**. 2. **Encrypted DVR Token (in JWE Format)**. Here's the example ```json { "encryptedUserDatatoken": "eyJ0eXAiOiJKV1QiLCJlbmMiOiJBMjU2R0NNIiwiZXBrIjp7Imt0eSI6IkVDIiwiY3J2IjoiUC0yNTYiLCJ4IjoielJJdWp5aDdmbG84OU5MbHFweEt0VWpmckhabVd1NVIzNGNkTlhnLVMzUSIsInkiOiJwNHN6LXc3U3pGRTBMbGY2R0Z4cUd2YmtuSHpEaENHY2dMSXZvTHpIbTlZIn0sImFsZyI6IkVDREgtRVMifQ..STqfLlyIzO-vlPu-.ju8WoPSCiLBSIUNw9EzSVjINBVx5NzN_XXb4jd8GjQ8d9USaQ0i9yU2M-kXf-eD8PZDYDvQ3hvuIi25MlRlyf_vWQSIrFuReHmZxQGZE1pcg7QXYRip0u4cfUQotvGjTSsBsa_bdXvH7gAInmalzAW_KrI08yXpT-CylitTwhmlm1RdVGWvGsMlu7u6vWWFHpOgHskN50ExfAWVa5_w93euEbxOcGjgegQTGxJocfyglmXIvIlW4XhwG8sj3OotdJbHvoqFMOfjkDf27HlMgG1jvjB-Af4CpIbdp3oP0suc_aDoayYG7butqMqrgk-OPcyIC5ELyDMWErx5WzPc1DY3icRStyzG2yPbs49l2gCcnubrwVbFZu-BqIE5hB6W7A_3Vfd479Heaec_sKzFJUlj9issy4vydy2Lsp_ldaP3J5p1tYvhxDGvoCvolkGHzwfjaNlciJ1BEfwQxyeipxrkXqzQ8oSgY7q5IPe7PtZ7O7JTpwvwbT04opAQiHatnnPbdlsCECSHj1UHuBNEfXcyK7gdzo9OaYOTPcD_Gbd88Yd8DxbKVH3e3M3z7O-ipqhD9vcuw92iOF9e1q23P9MXqjWjylDxSx4xWf9-imEW8aeGDulIQQBJ8OJZv9I7_eUiBTMWxxGgmcHsLSt7Chcv6uk3qj7yoxRqf22XvnxixOw3EtaVchxglqcdsV4dIWN5ynaJb67qUv2vFyig8XvS3x2b8bHzqS0_rNQy8L6ukzK1U0ndSW3QSqi0hcQ_CEwGzKNi445IhJ-NU_a2eGI_PiLhI2M00zpVjIIkc_bGOWHaB-3yCijUS0NjDhET78KWMTmkAEDPS0JVXni3okEd4mXhskbRr6y4OH-ShANti-FE69TO5KZmKZHkuY41xPO8_XNr1sL61z-LOsWb1nVHwfClUBUvFatIy2ElkxpjAhR-FhEiwk_oq6TXwBwLHEpQ8uJ1Es8jMMz0dtZVAo6D6OoutOH5Bo8JDtXX5uJZ7sY-GQgQX1dKLozbShF5IG40uEoGE_dIrd8MHfYZ_rqFct5tobRw299rCUMS3fcLHsJj1fqZgOGlzpy6ruBUNKZPpmNGzZcUiu2zcVheUKhjr69I7LV8h5gkb4LHkx0_AK8Lxl-jgLo-C3xGDIfG0dnZ3zoLDrK0IaueQNmxX-66rlHWhSCV-pSgJpXUFd-zv-IZix_tfV3svEaHyP9tYDg7MHus9mYkyBS6IyJqtEdmsoEYHwohVCS_lL51oIragrVtNLqXDV784zyEKKNB1XwQt5jL-XdOmrsGlJgzp2gUeeEwonEX0-LniBipeuVIAsFgXJ0ThNsLzm61BSLi5wL4xcyzRh9Bws6FRjchxEPkIq8AeQZaTZOddBx1xT4-vcMtnlAAy5ON10bCULCWm-jaAdI6UGSFur106Nr14Jj1dAFIkPFq1EyLFn_2E5D1RDp3siVJ1GCmCdNeVpy3TiHnmhaCXwZ5QkO4yLru4a8s6yWtL9P4Vktcli6tFMJ68RwdJP98YzPbvtnVjlcSei7B2lorhinEGr0JRJDZVhxujvTaYLlE2bFr1UgrAH8Sr9jpViv4Y2Ux2mFKCPdJXaWPsMc1t_s1JCjavdUnskW6afK0OOquHqoMZZoBJgNPq1HXW04Crkl5dM4D6OunA6afvUqxjpzItUlveN-chXInzVv2hX3ZFl8rWyAG3U0fR9_QJJWMzKGmu.P8Ov7hrTkyYla1iTlmXptg", "encryptedDvrToken": "eyJ0eXAiOiJKV1QiLCJlbmMiOiJBMjU2R0NNIiwiZXBrIjp7Imt0eSI6IkVDIiwiY3J2IjoiUC0yNTYiLCJ4IjoiSXQ0YXljSklYUUdFQWtTUjJfU3ZVRWU2QThHaGtscUkxVGxlNmR1MjFVWSIsInkiOiJNSGctcGU2RjhEUDJVbFhMZW1fd1F4NnFIVUdRS0prNzVqel96a3JnOGpjIn0sImFsZyI6IkVDREgtRVMifQ..CiVm0RozjNyk8DhZ.e2iJK7BzHqObLeB1mxO3kJo_iPZIh8H5p3nV3ZN_MtQasX2vg2jeKyGBFgklILwo9d9Sva83ZF0fOla6L9jdAUrQqXBehoWDwTLir3vjLaqITe3bsKmUIdDInmIaZHeoH3RkTn4PqPsBFDj7zFpTwCWeKBDKgZtckJ1N8gU5R-ohAnwZDzsbinGQ03x8w5UeIlmJyZcSL4MeV1NcSVSXryZIi-w_xuK3wr4JGBqSw993tArrxPfF9jENZfqrLczrYHZ08RW_CZBfjp1TxeQGM2ovlw672T-Fu_EA8giqaK4Oqi5u_a_Ixp6bHuGldtf7EeFcoSgoMP5qoK-nIkkW5mJyRqwwO0wTaYVoohfhYliTrlBdO92BW-lK9LqVjAYEG7H1LeKOmP8e2Ze42w_0BeOMlilLE6xyxSVmGZkqnTpehuIgYZmfbO-ps5pWEFXLQ5pba5tCr_jzl3-F9dGDaT3Gpvo8PM1Hn7fAKHgD6_kPaMm1e2MB8gzcfmjwBjg6M3TQ8P1alNFYgsloxCyMhiwMFx3yxKGfoDBAY-vQtaTyWT57INXFjE9DyLSm8pXxbQmA51bSt9Ke1OoTweSR1a_tBX3jMmNnrROPhS0rDQZfiCntytSuiLqIfiBv7jZOW0nH3BoUJ4DFB7j5P6inqdCl5qRRz1fz78Egij9aXuzXpD79bD6i7by8NTAJAVoXOuEPB8VFFjFA0rx3edxB3CWsGZD5lB64iGNo9WH5YdoxHW1ox6a1Vp0oHb1NYhVlxCMiLjs6R8FD7kFw-Dwl5WydUCyjO50_y_fBIAsUvTcfqS_7vCuvp-2d4WdXtBV8pdXyt-T8DCIMYObDp-X6syO7rl40L2i998euEj1cUJ4hjC9keNHRWQul6O1gIfLdZBamOpWGGQnjsHmd38lEqtxpPS0sjzPuRvjc9bg1zW0TOGslABZyt_Ura0xNr2aLFq8DTgP5F9cAKE-vSPuyhRAcj0BzgnYuxbcYblj2OPkxF5AkLmzNI4M5Bs5VVfrkN5fnlof0JuCfa7ocvCZgS01OMm-iOxeoZNlLbQz6zqPvkgfJDdsih7wwfCxkkL9m-XkGdE1_GYvaRN12EkG2gXfiYF1AxiZkdihDhU-EjHXUYnZar2TXdhjtO6zjAxDV6Iezp_O0krCXrFu95-dV_4xjexjD2vuy3QDRbsBYun9NI-nH55U_sXS8ztdPhTAG03XPMwMZmPbu1cXUZKTNIHmYA6Qr0zPwTm-BkZfZvi9dnKLEtH2LfZKGOvG6FamjarxS7-spLVrswVhbPsWugjcxfJruzaoi6XjlrMXQo5qB0yXfML5gEQEHJQHPu35C5etR8VLiUv9M7kwj-ld-7FW2M1jz6T6KktxieJseZl_YzOUdgTazSfk4zGyc8J68NQ1hIQ-uJ0GgMYvU54WOr6n_pOBKMfL_BYcNSCOFBR0YXnisFtf-r1YpfKQ3ILUmpsxS1nnTKAK8VOO1LpaItUjLrk56p-xYgdQBhnJ9jZ8xpsb7yoQqsTsug8LVn01yVyYihj2Bf6LmCsFpoDMTkN1Or491xaN0m-g4SpUPsyBPnmYvUhfUhPUw4eYXLAImWm6OxSN3cGSk3AKmt1kMRlW-ZLgAO26ecQSuYMUHhM4nJhV-aab62YEfXVB9B_nF7zPEgDS2uS7RlwIR2e-cgjzl_Lmm4pDGcvDyxp_Z7daYODMdJbwEdvE65U69K2Z_HMDLvl6Pc-jO-Y8-I5R4KMBlFuNf5i2b3RnTqRAVLwx2AJpLp55kysaGfpvH4s-9XPnRjZPjQVFIBZJtDAhJG790OsXSIxMh1nIHbyPPX7JKMVmiN_N3TeTZifEGin9IrSGPCi4z24Vn40T4MiYQEFs5vtLPoqiScm4fx9lnDUJY7F5IQn3OTU4K4XZFmm8eZkK7_gfNsylQ8aCn4GmK8X70NW4KR24eU29mt35-SCaxwYZYPopUFWo_LzyTrZug3AIqAc6AeUsU8mrK5A0rFGFboDGYHnnc-Q0Ffrnp4C64YS2E2jfe_-KfIjAwfEBigfghHhoBpX_RC5zLVoFrblJTjscgAgE6ZcVigmZPEAGMf4iQ5E8zTtrVYLlim12TEvRSNtro5wpZXgG0XuD-Qgja0V80dwfdL0QX3S_qre1d8Za43SqoZc5CEGTP98Po8GPIIpwD_006uB6qcvVVQW5BNw7KVRD48jcph3kXpGhzbkmDA5pDTfjWbbgYuFQetMdrrvGNrjr3.iLsHlasWc7GptHe5pdwD_Q" } ``` --- # Agent Instructions This documentation is published with GitBook. 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