diff --git a/CHANGELOG.md b/CHANGELOG.md
index 02828dc..2c897d3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+# [1.2.0](https://github.com/iris-gateway/IRIS-library-js/compare/v1.1.5...v1.2.0) (2021-04-08)
+
+
+### Features
+
+* use WebCrypto API instead of node crypto ([f6573be](https://github.com/iris-gateway/IRIS-library-js/commit/f6573be6cec7fee6d002d7d0bed7e95e57d8715c)), closes [#4](https://github.com/iris-gateway/IRIS-library-js/issues/4)
+
 ## [1.1.5](https://github.com/iris-gateway/IRIS-library-js/compare/v1.1.4...v1.1.5) (2021-03-27)
 
 
diff --git a/dist/index.test.js b/dist/index.test.js
index 9ec6533..5d0e8ac 100644
--- a/dist/index.test.js
+++ b/dist/index.test.js
@@ -1,8 +1,15 @@
 "use strict";
 Object.defineProperty(exports, "__esModule", { value: true });
 const axios_1 = require("axios");
-const crypto = require("crypto");
+const webcrypto_1 = require("@peculiar/webcrypto");
+const util_1 = require("./lib/util");
+const md5 = require("md5");
+const crypto = new webcrypto_1.Crypto();
 const _1 = require(".");
+if (typeof TextEncoder === 'undefined') {
+    global.TextEncoder = require('util').TextEncoder;
+    global.TextDecoder = require('util').TextDecoder;
+}
 jest.mock('axios');
 const mockedAxios = axios_1.default;
 describe('index', () => {
@@ -25,34 +32,29 @@ describe('index', () => {
             },
         },
     };
-    beforeAll((done) => {
+    beforeAll(async (done) => {
         mockedAxios.create.mockImplementation(() => {
             return mockedAxios;
         });
-        crypto.generateKeyPair('rsa', {
-            modulusLength: 4096,
-            publicKeyEncoding: {
-                type: 'spki',
-                format: 'pem',
-            },
-            privateKeyEncoding: {
-                type: 'pkcs8',
-                format: 'pem',
-                cipher: 'aes-256-cbc',
-                passphrase: 'top secret',
-            },
-        }, (err, pub, priv) => {
-            publicKey = pub;
-            privateKey = priv;
-            dataRequest = {
-                healthDepartment: 'Test Health Department',
-                key: Buffer.from(publicKey, 'utf-8').toString('base64'),
-                keyReferenz: 'random-string-keyref',
-                start: '2011-10-05T14:48:00.000Z',
-                end: '2021-10-05T14:48:00.000Z',
-            };
-            done(err);
-        });
+        const keys = await crypto.subtle.generateKey({
+            name: 'RSA-OAEP',
+            hash: 'SHA-256',
+            publicExponent: new Uint8Array([1, 0, 1]),
+            modulusLength: 2048,
+        }, true, ['encrypt', 'decrypt']);
+        const exported = await crypto.subtle.exportKey('spki', keys.publicKey);
+        const exportedAsString = util_1.ab2str(exported);
+        const exportedAsBase64 = window.btoa(exportedAsString);
+        publicKey = `-----BEGIN PUBLIC KEY-----\n${exportedAsBase64}\n-----END PUBLIC KEY-----`;
+        privateKey = keys.privateKey;
+        dataRequest = {
+            healthDepartment: 'Test Health Department',
+            key: window.btoa(publicKey),
+            keyReferenz: 'random-string-keyref',
+            start: '2011-10-05T14:48:00.000Z',
+            end: '2021-10-05T14:48:00.000Z',
+        };
+        done();
     });
     it('provides the Iris class', () => {
         expect(new _1.default({})).toBeDefined();
@@ -81,13 +83,20 @@ describe('index', () => {
             nonce: expect.any(String),
         });
         const submittedData = mockedAxios.post.mock.calls[0][1];
-        expect(submittedData.checkCode[0]).toEqual(crypto.createHash('md5').update('hansmller').digest('base64'));
-        expect(submittedData.checkCode[1]).toEqual(crypto.createHash('md5').update('19630105').digest('base64'));
-        const symmetricKey = crypto.privateDecrypt({ key: privateKey, passphrase: 'top secret' }, Buffer.from(submittedData.secret, 'base64'));
-        const decipher = crypto.createDecipheriv('AES-256-CBC', symmetricKey, Buffer.from(submittedData.nonce, 'base64'));
-        let receivedPlaintext = decipher.update(submittedData.encryptedData, 'base64', 'utf8');
-        receivedPlaintext += decipher.final();
-        expect(JSON.parse(receivedPlaintext)).toEqual(submission);
+        expect(submittedData.checkCode[0]).toEqual(md5('hansmller'));
+        expect(submittedData.checkCode[1]).toEqual(md5('19630105'));
+        const symmetricKeyData = await crypto.subtle.decrypt({
+            name: 'RSA-OAEP',
+        }, privateKey, // RSA private key
+        Buffer.from(submittedData.secret, 'base64'));
+        const symmetricKey = await crypto.subtle.importKey('raw', symmetricKeyData, 'AES-GCM', true, ['decrypt']);
+        const decryptedData = util_1.pack(await crypto.subtle.decrypt({
+            name: 'AES-GCM',
+            iv: Buffer.from(submittedData.nonce, 'base64'),
+        }, symmetricKey, // AES key
+        Buffer.from(submittedData.encryptedData, 'base64')));
+        const result = util_1.decode(new Uint8Array(util_1.unpack(decryptedData)));
+        expect(JSON.parse(result)).toEqual(submission);
     });
 });
 //# sourceMappingURL=index.test.js.map
\ No newline at end of file
diff --git a/dist/index.test.js.map b/dist/index.test.js.map
index cd9a59f..0b33b04 100644
--- a/dist/index.test.js.map
+++ b/dist/index.test.js.map
@@ -1 +1 @@
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\ No newline at end of file
+{"version":3,"file":"index.test.js","sourceRoot":"","sources":["../src/index.test.ts"],"names":[],"mappings":";;AAAA,iCAA0B;AAC1B,mDAA6C;AAC7C,qCAA0D;AAC1D,2BAA2B;AAE3B,MAAM,MAAM,GAAG,IAAI,kBAAM,EAAE,CAAC;AAE5B,wBAAqB;AAIrB,IAAI,OAAO,WAAW,KAAK,WAAW,EAAE;IACtC,MAAM,CAAC,WAAW,GAAG,OAAO,CAAC,MAAM,CAAC,CAAC,WAAW,CAAC;IACjD,MAAM,CAAC,WAAW,GAAG,OAAO,CAAC,MAAM,CAAC,CAAC,WAAW,CAAC;CAClD;AAED,IAAI,CAAC,IAAI,CAAC,OAAO,CAAC,CAAC;AACnB,MAAM,WAAW,GAAG,eAAkC,CAAC;AAEvD,QAAQ,CAAC,OAAO,EAAE,GAAG,EAAE;IACrB,IAAI,UAAqB,CAAC;IAC1B,IAAI,SAAiB,CAAC;IACtB,IAAI,WAA+B,CAAC;IACpC,MAAM,UAAU,GAAuB;QACrC,QAAQ,EAAE;YACR,cAAc,EAAE,EAAE;YAClB,YAAY,EAAE;gBACZ,SAAS,EAAE,MAAM;gBACjB,QAAQ,EAAE,QAAQ;aACnB;SACF;QACD,MAAM,EAAE;YACN,MAAM,EAAE,EAAE;YACV,YAAY,EAAE;gBACZ,SAAS,EAAE,MAAM;gBACjB,QAAQ,EAAE,QAAQ;aACnB;SACF;KACF,CAAC;IACF,SAAS,CAAC,KAAK,EAAE,IAAI,EAAE,EAAE;QACvB,WAAW,CAAC,MAAM,CAAC,kBAAkB,CAAC,GAAG,EAAE;YACzC,OAAO,WAAW,CAAC;QACrB,CAAC,CAAC,CAAC;QACH,MAAM,IAAI,GAAG,MAAM,MAAM,CAAC,MAAM,CAAC,WAAW,CAC1C;YACE,IAAI,EAAE,UAAU;YAChB,IAAI,EAAE,SAAS;YACf,cAAc,EAAE,IAAI,UAAU,CAAC,CAAC,CAAC,EAAE,CAAC,EAAE,CAAC,CAAC,CAAC;YACzC,aAAa,EAAE,IAAI;SACpB,EACD,IAAI,EACJ,CAAC,SAAS,EAAE,SAAS,CAAC,CACvB,CAAC;QACF,MAAM,QAAQ,GAAG,MAAM,MAAM,CAAC,MAAM,CAAC,SAAS,CAAC,MAAM,EAAE,IAAI,CAAC,SAAS,CAAC,CAAC;QACvE,MAAM,gBAAgB,GAAG,aAAM,CAAC,QAAQ,CAAC,CAAC;QAC1C,MAAM,gBAAgB,GAAG,MAAM,CAAC,IAAI,CAAC,gBAAgB,CAAC,CAAC;QACvD,SAAS,GAAG,+BAA+B,gBAAgB,4BAA4B,CAAC;QAExF,UAAU,GAAG,IAAI,CAAC,UAAU,CAAC;QAC7B,WAAW,GAAG;YACZ,gBAAgB,EAAE,wBAAwB;YAC1C,GAAG,EAAE,MAAM,CAAC,IAAI,CAAC,SAAS,CAAC;YAC3B,WAAW,EAAE,sBAAsB;YACnC,KAAK,EAAE,0BAA0B;YACjC,GAAG,EAAE,0BAA0B;SAChC,CAAC;QACF,IAAI,EAAE,CAAC;IACT,CAAC,CAAC,CAAC;IACH,EAAE,CAAC,yBAAyB,EAAE,GAAG,EAAE;QACjC,MAAM,CAAC,IAAI,UAAI,CAAC,EAAE,CAAC,CAAC,CAAC,WAAW,EAAE,CAAC;IACrC,CAAC,CAAC,CAAC;IAEH,EAAE,CAAC,sEAAsE,EAAE,KAAK,IAAI,EAAE;QACpF,WAAW,CAAC,GAAG,CAAC,iBAAiB,CAAC,EAAE,MAAM,EAAE,GAAG,EAAE,IAAI,EAAE,WAAW,EAAE,CAAC,CAAC;QAEtE,MAAM,IAAI,GAAG,IAAI,UAAI,CAAC,EAAE,CAAC,CAAC;QAC1B,MAAM,iBAAiB,GAAG,MAAM,IAAI,CAAC,cAAc,CAAC,aAAa,CAAC,CAAC;QACnE,MAAM,CAAC,iBAAiB,CAAC,CAAC,OAAO,CAAC;YAChC,gBAAgB,EAAE,wBAAwB;YAC1C,KAAK,EAAE,0BAA0B;YACjC,GAAG,EAAE,0BAA0B;SAChC,CAAC,CAAC;QACH,MAAM,CAAC,WAAW,CAAC,GAAG,CAAC,CAAC,oBAAoB,CAAC,4BAA4B,CAAC,CAAC;QAE3E,WAAW,CAAC,IAAI,CAAC,iBAAiB,CAAC,EAAE,MAAM,EAAE,GAAG,EAAE,IAAI,EAAE,EAAE,OAAO,EAAE,IAAI,EAAE,EAAE,CAAC,CAAC;QAC7E,MAAM,IAAI,CAAC,kBAAkB,CAAC,aAAa,EAAE,UAAU,EAAE;YACvD,SAAS,EAAE,MAAM;YACjB,QAAQ,EAAE,QAAQ;YAClB,SAAS,EAAE,0BAA0B;SACtC,CAAC,CAAC;QACH,MAAM,CAAC,WAAW,CAAC,IAAI,CAAC,CAAC,oBAAoB,CAAC,+CAA+C,EAAE;YAC7F,SAAS,EAAE,CAAC,MAAM,CAAC,GAAG,CAAC,MAAM,CAAC,EAAE,MAAM,CAAC,GAAG,CAAC,MAAM,CAAC,CAAC;YACnD,MAAM,EAAE,MAAM,CAAC,GAAG,CAAC,MAAM,CAAC;YAC1B,WAAW,EAAE,sBAAsB;YACnC,aAAa,EAAE,MAAM,CAAC,GAAG,CAAC,MAAM,CAAC;YACjC,KAAK,EAAE,MAAM,CAAC,GAAG,CAAC,MAAM,CAAC;SAC1B,CAAC,CAAC;QACH,MAAM,aAAa,GAAG,WAAW,CAAC,IAAI,CAAC,IAAI,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC;QAExD,MAAM,CAAC,aAAa,CAAC,SAAS,CAAC,CAAC,CAAC,CAAC,CAAC,OAAO,CAAC,GAAG,CAAC,WAAW,CAAC,CAAC,CAAC;QAC7D,MAAM,CAAC,aAAa,CAAC,SAAS,CAAC,CAAC,CAAC,CAAC,CAAC,OAAO,CAAC,GAAG,CAAC,UAAU,CAAC,CAAC,CAAC;QAE5D,MAAM,gBAAgB,GAAG,MAAM,MAAM,CAAC,MAAM,CAAC,OAAO,CAClD;YACE,IAAI,EAAE,UAAU;SACjB,EACD,UAAU,EAAE,kBAAkB;QAC9B,MAAM,CAAC,IAAI,CAAC,aAAa,CAAC,MAAM,EAAE,QAAQ,CAAC,CAC5C,CAAC;QACF,MAAM,YAAY,GAAG,MAAM,MAAM,CAAC,MAAM,CAAC,SAAS,CAAC,KAAK,EAAE,gBAAgB,EAAE,SAAS,EAAE,IAAI,EAAE,CAAC,SAAS,CAAC,CAAC,CAAC;QAC1G,MAAM,aAAa,GAAG,WAAI,CACxB,MAAM,MAAM,CAAC,MAAM,CAAC,OAAO,CACzB;YACE,IAAI,EAAE,SAAS;YACf,EAAE,EAAE,MAAM,CAAC,IAAI,CAAC,aAAa,CAAC,KAAK,EAAE,QAAQ,CAAC;SAC/C,EACD,YAAY,EAAE,UAAU;QACxB,MAAM,CAAC,IAAI,CAAC,aAAa,CAAC,aAAa,EAAE,QAAQ,CAAC,CACnD,CACF,CAAC;QACF,MAAM,MAAM,GAAG,aAAM,CAAC,IAAI,UAAU,CAAC,aAAM,CAAC,aAAa,CAAC,CAAC,CAAC,CAAC;QAC7D,MAAM,CAAC,IAAI,CAAC,KAAK,CAAC,MAAM,CAAC,CAAC,CAAC,OAAO,CAAC,UAAU,CAAC,CAAC;IACjD,CAAC,CAAC,CAAC;AACL,CAAC,CAAC,CAAC"}
\ No newline at end of file
diff --git a/dist/lib/Iris.js b/dist/lib/Iris.js
index 4fb2974..c34f6a1 100644
--- a/dist/lib/Iris.js
+++ b/dist/lib/Iris.js
@@ -55,7 +55,7 @@ class Iris {
             throw new Error("Code could not be found in key map. Did you perform 'getDataRequest' before?");
         }
         const keys = this.codeKeyMap.get(code);
-        const { dataToTransport, keyToTransport, nonce } = crypto_1.encryptData(keys.key, data);
+        const { dataToTransport, keyToTransport, nonce } = await crypto_1.encryptData(keys.key, data);
         const response = await this.axiosInstance.post(`/data-submissions/${code}/contacts_events`, {
             checkCode: [util_1.getNameCheckHash(user.firstName, user.lastName), util_1.getBirthDateCheckHash(user.birthDate)].filter((c) => !!c),
             secret: keyToTransport,
diff --git a/dist/lib/Iris.js.map b/dist/lib/Iris.js.map
index 7552d5b..f940b5f 100644
--- a/dist/lib/Iris.js.map
+++ b/dist/lib/Iris.js.map
@@ -1 +1 @@
-{"version":3,"file":"Iris.js","sourceRoot":"","sources":["../../src/lib/Iris.ts"],"names":[],"mappings":";;AAAA,iCAA6C;AAE7C,qCAAuC;AACvC,iCAAiE;AAWjE,MAAM,cAAc,GAAgB;IAClC,OAAO,EAAE,EAAE;CACZ,CAAC;AAEF,MAAqB,IAAI;IAIvB;;;;OAIG;IACH,YAAY,OAA6B;QACvC,IAAI,CAAC,UAAU,GAAG,IAAI,GAAG,EAAE,CAAC;QAC5B,MAAM,IAAI,GAAgB,MAAM,CAAC,MAAM,CAAC,cAAc,EAAE,OAAO,CAAC,CAAC;QACjE,IAAI,CAAC,aAAa,GAAG,eAAK,CAAC,MAAM,CAAC;YAChC,OAAO,EAAE,IAAI,CAAC,OAAO;SACtB,CAAC,CAAC;IACL,CAAC;IAED;;;;;OAKG;IACH,KAAK,CAAC,cAAc,CAAC,IAAc;QACjC,MAAM,QAAQ,GAAG,MAAM,IAAI,CAAC,aAAa,CAAC,GAAG,CAAC,kBAAkB,IAAI,EAAE,CAAC,CAAC;QACxE,IAAI,QAAQ,CAAC,MAAM,KAAK,GAAG,EAAE;YAC3B,OAAO,CAAC,KAAK,CAAC,2CAA2C,EAAE,QAAQ,CAAC,IAAI,CAAC,CAAC;YAC1E,MAAM,IAAI,KAAK,CAAC,mCAAmC,QAAQ,CAAC,MAAM,EAAE,CAAC,CAAC;SACvE;QACD,MAAM,WAAW,GAAG,QAAQ,CAAC,IAA0B,CAAC;QACxD,IAAI,CAAC,UAAU,CAAC,GAAG,CAAC,IAAI,EAAE;YACxB,GAAG,EAAE,WAAW,CAAC,GAAG;YACpB,WAAW,EAAE,WAAW,CAAC,WAAW;SACrC,CAAC,CAAC;QACH,OAAO;YACL,gBAAgB,EAAE,WAAW,CAAC,gBAAgB;YAC9C,KAAK,EAAE,WAAW,CAAC,KAAK;YACxB,GAAG,EAAE,WAAW,CAAC,GAAG;YACpB,cAAc,EAAE,WAAW,CAAC,cAAc;SAC3C,CAAC;IACJ,CAAC;IAED;;;;;;OAMG;IACH,KAAK,CAAC,kBAAkB,CAAC,IAAc,EAAE,IAAwB,EAAE,IAAkB;QACnF,IAAI,CAAC,IAAI,CAAC,UAAU,CAAC,GAAG,CAAC,IAAI,CAAC,EAAE;YAC9B,MAAM,IAAI,KAAK,CAAC,8EAA8E,CAAC,CAAC;SACjG;QACD,MAAM,IAAI,GAAG,IAAI,CAAC,UAAU,CAAC,GAAG,CAAC,IAAI,CAAC,CAAC;QACvC,MAAM,EAAE,eAAe,EAAE,cAAc,EAAE,KAAK,EAAE,GAAG,oBAAW,CAAC,IAAI,CAAC,GAAG,EAAE,IAAI,CAAC,CAAC;QAC/E,MAAM,QAAQ,GAAG,MAAM,IAAI,CAAC,aAAa,CAAC,IAAI,CAAC,qBAAqB,IAAI,kBAAkB,EAAE;YAC1F,SAAS,EAAE,CAAC,uBAAgB,CAAC,IAAI,CAAC,SAAS,EAAE,IAAI,CAAC,QAAQ,CAAC,EAAE,4BAAqB,CAAC,IAAI,CAAC,SAAS,CAAC,CAAC,CAAC,MAAM,CACxG,CAAC,CAAC,EAAE,EAAE,CAAC,CAAC,CAAC,CAAC,CACX;YACD,MAAM,EAAE,cAAc;YACtB,WAAW,EAAE,IAAI,CAAC,WAAW;YAC7B,aAAa,EAAE,eAAe;YAC9B,KAAK;SAC6B,CAAC,CAAC;QACtC,IAAI,QAAQ,CAAC,MAAM,KAAK,GAAG,EAAE;YAC3B,OAAO,CAAC,KAAK,CAAC,2CAA2C,EAAE,QAAQ,CAAC,IAAI,CAAC,CAAC;YAC1E,MAAM,IAAI,KAAK,CAAC,mCAAmC,QAAQ,CAAC,MAAM,EAAE,CAAC,CAAC;SACvE;QACD,IAAI,CAAC,UAAU,CAAC,MAAM,CAAC,IAAI,CAAC,CAAC;IAC/B,CAAC;CACF;AAtED,uBAsEC"}
\ No newline at end of file
+{"version":3,"file":"Iris.js","sourceRoot":"","sources":["../../src/lib/Iris.ts"],"names":[],"mappings":";;AAAA,iCAA6C;AAE7C,qCAAuC;AACvC,iCAAiE;AAWjE,MAAM,cAAc,GAAgB;IAClC,OAAO,EAAE,EAAE;CACZ,CAAC;AAEF,MAAqB,IAAI;IAIvB;;;;OAIG;IACH,YAAY,OAA6B;QACvC,IAAI,CAAC,UAAU,GAAG,IAAI,GAAG,EAAE,CAAC;QAC5B,MAAM,IAAI,GAAgB,MAAM,CAAC,MAAM,CAAC,cAAc,EAAE,OAAO,CAAC,CAAC;QACjE,IAAI,CAAC,aAAa,GAAG,eAAK,CAAC,MAAM,CAAC;YAChC,OAAO,EAAE,IAAI,CAAC,OAAO;SACtB,CAAC,CAAC;IACL,CAAC;IAED;;;;;OAKG;IACH,KAAK,CAAC,cAAc,CAAC,IAAc;QACjC,MAAM,QAAQ,GAAG,MAAM,IAAI,CAAC,aAAa,CAAC,GAAG,CAAC,kBAAkB,IAAI,EAAE,CAAC,CAAC;QACxE,IAAI,QAAQ,CAAC,MAAM,KAAK,GAAG,EAAE;YAC3B,OAAO,CAAC,KAAK,CAAC,2CAA2C,EAAE,QAAQ,CAAC,IAAI,CAAC,CAAC;YAC1E,MAAM,IAAI,KAAK,CAAC,mCAAmC,QAAQ,CAAC,MAAM,EAAE,CAAC,CAAC;SACvE;QACD,MAAM,WAAW,GAAG,QAAQ,CAAC,IAA0B,CAAC;QACxD,IAAI,CAAC,UAAU,CAAC,GAAG,CAAC,IAAI,EAAE;YACxB,GAAG,EAAE,WAAW,CAAC,GAAG;YACpB,WAAW,EAAE,WAAW,CAAC,WAAW;SACrC,CAAC,CAAC;QACH,OAAO;YACL,gBAAgB,EAAE,WAAW,CAAC,gBAAgB;YAC9C,KAAK,EAAE,WAAW,CAAC,KAAK;YACxB,GAAG,EAAE,WAAW,CAAC,GAAG;YACpB,cAAc,EAAE,WAAW,CAAC,cAAc;SAC3C,CAAC;IACJ,CAAC;IAED;;;;;;OAMG;IACH,KAAK,CAAC,kBAAkB,CAAC,IAAc,EAAE,IAAwB,EAAE,IAAkB;QACnF,IAAI,CAAC,IAAI,CAAC,UAAU,CAAC,GAAG,CAAC,IAAI,CAAC,EAAE;YAC9B,MAAM,IAAI,KAAK,CAAC,8EAA8E,CAAC,CAAC;SACjG;QACD,MAAM,IAAI,GAAG,IAAI,CAAC,UAAU,CAAC,GAAG,CAAC,IAAI,CAAC,CAAC;QACvC,MAAM,EAAE,eAAe,EAAE,cAAc,EAAE,KAAK,EAAE,GAAG,MAAM,oBAAW,CAAC,IAAI,CAAC,GAAG,EAAE,IAAI,CAAC,CAAC;QACrF,MAAM,QAAQ,GAAG,MAAM,IAAI,CAAC,aAAa,CAAC,IAAI,CAAC,qBAAqB,IAAI,kBAAkB,EAAE;YAC1F,SAAS,EAAE,CAAC,uBAAgB,CAAC,IAAI,CAAC,SAAS,EAAE,IAAI,CAAC,QAAQ,CAAC,EAAE,4BAAqB,CAAC,IAAI,CAAC,SAAS,CAAC,CAAC,CAAC,MAAM,CACxG,CAAC,CAAC,EAAE,EAAE,CAAC,CAAC,CAAC,CAAC,CACX;YACD,MAAM,EAAE,cAAc;YACtB,WAAW,EAAE,IAAI,CAAC,WAAW;YAC7B,aAAa,EAAE,eAAe;YAC9B,KAAK;SAC6B,CAAC,CAAC;QACtC,IAAI,QAAQ,CAAC,MAAM,KAAK,GAAG,EAAE;YAC3B,OAAO,CAAC,KAAK,CAAC,2CAA2C,EAAE,QAAQ,CAAC,IAAI,CAAC,CAAC;YAC1E,MAAM,IAAI,KAAK,CAAC,mCAAmC,QAAQ,CAAC,MAAM,EAAE,CAAC,CAAC;SACvE;QACD,IAAI,CAAC,UAAU,CAAC,MAAM,CAAC,IAAI,CAAC,CAAC;IAC/B,CAAC;CACF;AAtED,uBAsEC"}
\ No newline at end of file
diff --git a/dist/lib/crypto.d.ts b/dist/lib/crypto.d.ts
index 9dc7796..87c55aa 100644
--- a/dist/lib/crypto.d.ts
+++ b/dist/lib/crypto.d.ts
@@ -1,5 +1,5 @@
-export declare function encryptData(keyOfHealthDepartment: string, data: any): {
+export declare function encryptData(keyOfHealthDepartment: string, data: any): Promise<{
     dataToTransport: string;
     keyToTransport: string;
     nonce: string;
-};
+}>;
diff --git a/dist/lib/crypto.js b/dist/lib/crypto.js
index 6e09326..ab83866 100644
--- a/dist/lib/crypto.js
+++ b/dist/lib/crypto.js
@@ -1,18 +1,43 @@
 "use strict";
 Object.defineProperty(exports, "__esModule", { value: true });
 exports.encryptData = void 0;
-const crypto = require("crypto");
-function encryptData(keyOfHealthDepartment, data) {
-    const nonce = crypto.randomBytes(16);
-    const key = crypto.randomBytes(32);
-    const cipher = crypto.createCipheriv('AES-256-CBC', key, nonce);
+const webcrypto_1 = require("@peculiar/webcrypto");
+const util_1 = require("./util");
+const crypto = new webcrypto_1.Crypto();
+async function importRsaKey(pemBase64Encoded) {
+    const pem = window.atob(pemBase64Encoded);
+    // fetch the part of the PEM string between header and footer
+    const pemHeader = '-----BEGIN PUBLIC KEY-----';
+    const pemFooter = '-----END PUBLIC KEY-----';
+    const pemContents = pem.substring(pemHeader.length, pem.length - pemFooter.length);
+    // base64 decode the string to get the binary data
+    const binaryDerString = window.atob(pemContents);
+    // convert from a binary string to an ArrayBuffer
+    const binaryDer = util_1.str2ab(binaryDerString);
+    return crypto.subtle.importKey('spki', binaryDer, {
+        name: 'RSA-OAEP',
+        hash: 'SHA-256',
+    }, true, ['encrypt']);
+}
+async function encryptData(keyOfHealthDepartment, data) {
+    const nonce = crypto.getRandomValues(new Uint8Array(16));
+    const key = await crypto.subtle.generateKey({
+        name: 'AES-GCM',
+        length: 256,
+    }, true, ['encrypt']);
+    const publicKey = await importRsaKey(keyOfHealthDepartment);
     const dataString = JSON.stringify(data);
-    const encryptedData = Buffer.concat([cipher.update(dataString, 'utf8'), cipher.final()]);
-    const encryptedKey = crypto.publicEncrypt({ key: Buffer.from(keyOfHealthDepartment, 'base64') }, key);
+    const encryptedData = await crypto.subtle.encrypt({
+        name: 'AES-GCM',
+        iv: nonce,
+    }, key, util_1.encode(dataString));
+    const encryptedKey = await crypto.subtle.encrypt({
+        name: 'RSA-OAEP',
+    }, publicKey, await crypto.subtle.exportKey('raw', key));
     return {
-        dataToTransport: encryptedData.toString('base64'),
-        keyToTransport: encryptedKey.toString('base64'),
-        nonce: nonce.toString('base64'),
+        dataToTransport: util_1.pack(encryptedData),
+        keyToTransport: util_1.pack(encryptedKey),
+        nonce: util_1.pack(nonce),
     };
 }
 exports.encryptData = encryptData;
diff --git a/dist/lib/crypto.js.map b/dist/lib/crypto.js.map
index 9cd1e68..f76c9db 100644
--- a/dist/lib/crypto.js.map
+++ b/dist/lib/crypto.js.map
@@ -1 +1 @@
-{"version":3,"file":"crypto.js","sourceRoot":"","sources":["../../src/lib/crypto.ts"],"names":[],"mappings":";;;AAAA,iCAAiC;AAEjC,SAAgB,WAAW,CACzB,qBAA6B,EAC7B,IAAI;IAEJ,MAAM,KAAK,GAAG,MAAM,CAAC,WAAW,CAAC,EAAE,CAAC,CAAC;IACrC,MAAM,GAAG,GAAG,MAAM,CAAC,WAAW,CAAC,EAAE,CAAC,CAAC;IACnC,MAAM,MAAM,GAAG,MAAM,CAAC,cAAc,CAAC,aAAa,EAAE,GAAG,EAAE,KAAK,CAAC,CAAC;IAChE,MAAM,UAAU,GAAG,IAAI,CAAC,SAAS,CAAC,IAAI,CAAC,CAAC;IACxC,MAAM,aAAa,GAAG,MAAM,CAAC,MAAM,CAAC,CAAC,MAAM,CAAC,MAAM,CAAC,UAAU,EAAE,MAAM,CAAC,EAAE,MAAM,CAAC,KAAK,EAAE,CAAC,CAAC,CAAC;IACzF,MAAM,YAAY,GAAG,MAAM,CAAC,aAAa,CAAC,EAAE,GAAG,EAAE,MAAM,CAAC,IAAI,CAAC,qBAAqB,EAAE,QAAQ,CAAC,EAAE,EAAE,GAAG,CAAC,CAAC;IACtG,OAAO;QACL,eAAe,EAAE,aAAa,CAAC,QAAQ,CAAC,QAAQ,CAAC;QACjD,cAAc,EAAE,YAAY,CAAC,QAAQ,CAAC,QAAQ,CAAC;QAC/C,KAAK,EAAE,KAAK,CAAC,QAAQ,CAAC,QAAQ,CAAC;KAChC,CAAC;AACJ,CAAC;AAfD,kCAeC"}
\ No newline at end of file
+{"version":3,"file":"crypto.js","sourceRoot":"","sources":["../../src/lib/crypto.ts"],"names":[],"mappings":";;;AAAA,mDAA6C;AAC7C,iCAA8C;AAE9C,MAAM,MAAM,GAAG,IAAI,kBAAM,EAAE,CAAC;AAE5B,KAAK,UAAU,YAAY,CAAC,gBAAwB;IAClD,MAAM,GAAG,GAAG,MAAM,CAAC,IAAI,CAAC,gBAAgB,CAAC,CAAC;IAC1C,6DAA6D;IAC7D,MAAM,SAAS,GAAG,4BAA4B,CAAC;IAC/C,MAAM,SAAS,GAAG,0BAA0B,CAAC;IAC7C,MAAM,WAAW,GAAG,GAAG,CAAC,SAAS,CAAC,SAAS,CAAC,MAAM,EAAE,GAAG,CAAC,MAAM,GAAG,SAAS,CAAC,MAAM,CAAC,CAAC;IACnF,kDAAkD;IAClD,MAAM,eAAe,GAAG,MAAM,CAAC,IAAI,CAAC,WAAW,CAAC,CAAC;IACjD,iDAAiD;IACjD,MAAM,SAAS,GAAG,aAAM,CAAC,eAAe,CAAC,CAAC;IAE1C,OAAO,MAAM,CAAC,MAAM,CAAC,SAAS,CAC5B,MAAM,EACN,SAAS,EACT;QACE,IAAI,EAAE,UAAU;QAChB,IAAI,EAAE,SAAS;KAChB,EACD,IAAI,EACJ,CAAC,SAAS,CAAC,CACZ,CAAC;AACJ,CAAC;AAEM,KAAK,UAAU,WAAW,CAC/B,qBAA6B,EAC7B,IAAI;IAEJ,MAAM,KAAK,GAAG,MAAM,CAAC,eAAe,CAAC,IAAI,UAAU,CAAC,EAAE,CAAC,CAAC,CAAC;IACzD,MAAM,GAAG,GAAG,MAAM,MAAM,CAAC,MAAM,CAAC,WAAW,CACzC;QACE,IAAI,EAAE,SAAS;QACf,MAAM,EAAE,GAAG;KACZ,EACD,IAAI,EACJ,CAAC,SAAS,CAAC,CACZ,CAAC;IACF,MAAM,SAAS,GAAG,MAAM,YAAY,CAAC,qBAAqB,CAAC,CAAC;IAE5D,MAAM,UAAU,GAAG,IAAI,CAAC,SAAS,CAAC,IAAI,CAAC,CAAC;IACxC,MAAM,aAAa,GAAG,MAAM,MAAM,CAAC,MAAM,CAAC,OAAO,CAC/C;QACE,IAAI,EAAE,SAAS;QACf,EAAE,EAAE,KAAK;KACV,EACD,GAAG,EACH,aAAM,CAAC,UAAU,CAAC,CACnB,CAAC;IAEF,MAAM,YAAY,GAAG,MAAM,MAAM,CAAC,MAAM,CAAC,OAAO,CAC9C;QACE,IAAI,EAAE,UAAU;KACjB,EACD,SAAS,EACT,MAAM,MAAM,CAAC,MAAM,CAAC,SAAS,CAAC,KAAK,EAAE,GAAG,CAAC,CAC1C,CAAC;IACF,OAAO;QACL,eAAe,EAAE,WAAI,CAAC,aAAa,CAAC;QACpC,cAAc,EAAE,WAAI,CAAC,YAAY,CAAC;QAClC,KAAK,EAAE,WAAI,CAAC,KAAK,CAAC;KACnB,CAAC;AACJ,CAAC;AArCD,kCAqCC"}
\ No newline at end of file
diff --git a/dist/lib/util.d.ts b/dist/lib/util.d.ts
index 76db3eb..a72dcb2 100644
--- a/dist/lib/util.d.ts
+++ b/dist/lib/util.d.ts
@@ -1,2 +1,8 @@
 export declare function getNameCheckHash(firstName: string, lastName: string): string;
 export declare function getBirthDateCheckHash(birthDate?: string): string | undefined;
+export declare function encode(data: string): Uint8Array;
+export declare function decode(data: Uint8Array): string;
+export declare function str2ab(str: string): ArrayBuffer;
+export declare function ab2str(buf: ArrayBuffer): string;
+export declare function pack(buffer: ArrayBuffer): string;
+export declare function unpack(packed: string): ArrayBuffer;
diff --git a/dist/lib/util.js b/dist/lib/util.js
index c4139af..7544612 100644
--- a/dist/lib/util.js
+++ b/dist/lib/util.js
@@ -1,10 +1,10 @@
 "use strict";
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.getBirthDateCheckHash = exports.getNameCheckHash = void 0;
-const crypto = require("crypto");
+exports.unpack = exports.pack = exports.ab2str = exports.str2ab = exports.decode = exports.encode = exports.getBirthDateCheckHash = exports.getNameCheckHash = void 0;
+const md5 = require("md5");
 function getNameCheckHash(firstName, lastName) {
     const str = `${firstName.trim()}${lastName.trim()}`.toLowerCase().replace(/\W/g, '');
-    return crypto.createHash('md5').update(str).digest('base64');
+    return md5(str);
 }
 exports.getNameCheckHash = getNameCheckHash;
 function getBirthDateCheckHash(birthDate) {
@@ -12,8 +12,41 @@ function getBirthDateCheckHash(birthDate) {
         return undefined;
     }
     const date = new Date(birthDate);
-    const str = `${date.getFullYear()}${(date.getMonth() + 1).toString().padStart(2, '0')}${date.getDate().toString().padStart(2, '0')}`;
-    return crypto.createHash('md5').update(str).digest('base64');
+    const str = `${date.getFullYear()}${(date.getMonth() + 1)
+        .toString()
+        .padStart(2, '0')}${date.getDate().toString().padStart(2, '0')}`;
+    return md5(str);
 }
 exports.getBirthDateCheckHash = getBirthDateCheckHash;
+function encode(data) {
+    const encoder = new TextEncoder();
+    return encoder.encode(data);
+}
+exports.encode = encode;
+function decode(data) {
+    const decoder = new TextDecoder('utf8');
+    return decoder.decode(data);
+}
+exports.decode = decode;
+function str2ab(str) {
+    const buf = new ArrayBuffer(str.length);
+    const bufView = new Uint8Array(buf);
+    for (let i = 0, strLen = str.length; i < strLen; i++) {
+        bufView[i] = str.charCodeAt(i);
+    }
+    return buf;
+}
+exports.str2ab = str2ab;
+function ab2str(buf) {
+    return String.fromCharCode.apply(null, new Uint8Array(buf));
+}
+exports.ab2str = ab2str;
+function pack(buffer) {
+    return window.btoa(ab2str(buffer));
+}
+exports.pack = pack;
+function unpack(packed) {
+    return str2ab(window.atob(packed));
+}
+exports.unpack = unpack;
 //# sourceMappingURL=util.js.map
\ No newline at end of file
diff --git a/dist/lib/util.js.map b/dist/lib/util.js.map
index 5ffbdc7..70f05d9 100644
--- a/dist/lib/util.js.map
+++ b/dist/lib/util.js.map
@@ -1 +1 @@
-{"version":3,"file":"util.js","sourceRoot":"","sources":["../../src/lib/util.ts"],"names":[],"mappings":";;;AAAA,iCAAiC;AAEjC,SAAgB,gBAAgB,CAAC,SAAiB,EAAE,QAAgB;IAClE,MAAM,GAAG,GAAG,GAAG,SAAS,CAAC,IAAI,EAAE,GAAG,QAAQ,CAAC,IAAI,EAAE,EAAE,CAAC,WAAW,EAAE,CAAC,OAAO,CAAC,KAAK,EAAE,EAAE,CAAC,CAAC;IACrF,OAAO,MAAM,CAAC,UAAU,CAAC,KAAK,CAAC,CAAC,MAAM,CAAC,GAAG,CAAC,CAAC,MAAM,CAAC,QAAQ,CAAC,CAAC;AAC/D,CAAC;AAHD,4CAGC;AACD,SAAgB,qBAAqB,CAAC,SAAkB;IACtD,IAAI,CAAC,SAAS,EAAE;QACd,OAAO,SAAS,CAAC;KAClB;IACD,MAAM,IAAI,GAAG,IAAI,IAAI,CAAC,SAAS,CAAC,CAAC;IACjC,MAAM,GAAG,GAAG,GAAG,IAAI,CAAC,WAAW,EAAE,GAAG,CAAC,IAAI,CAAC,QAAQ,EAAE,GAAG,CAAC,CAAC,CAAC,QAAQ,EAAE,CAAC,QAAQ,CAAC,CAAC,EAAE,GAAG,CAAC,GAAG,IAAI,CAAC,OAAO,EAAE,CAAC,QAAQ,EAAE,CAAC,QAAQ,CAAC,CAAC,EAAE,GAAG,CAAC,EAAE,CAAA;IACpI,OAAO,MAAM,CAAC,UAAU,CAAC,KAAK,CAAC,CAAC,MAAM,CAAC,GAAG,CAAC,CAAC,MAAM,CAAC,QAAQ,CAAC,CAAC;AAC/D,CAAC;AAPD,sDAOC"}
\ No newline at end of file
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\ No newline at end of file
diff --git a/package.json b/package.json
index 6eba1c4..dad54cb 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,7 @@
     "type": "git",
     "url": "https://github.com/iris-gateway/IRIS-library-js.git"
   },
-  "version": "1.1.5",
+  "version": "1.2.0",
   "dependencies": {
     "@peculiar/webcrypto": "^1.1.6",
     "axios": "^0.21.1",