diff --git a/refresh-certificate.py b/refresh-certificate.py
index 956c406..c586795 100755
--- a/refresh-certificate.py
+++ b/refresh-certificate.py
@@ -41,6 +41,7 @@ from cryptography import x509
 from cryptography.hazmat.primitives.serialization import Encoding
 from dateutil.parser import parse
 from typeguard import typechecked
+from datetime import datetime, timedelta
 
 import requests
 import coloredlogs
@@ -344,6 +345,40 @@ def install_certificate(hostname: str, verify: bool, username: str, password: st
 
             logger.info('Certificate successfully installed.')
 
+@typechecked
+def self_signed(hostname:str, verify:bool, username: str, password: str, bearer=None) -> None:
+    logger = logging.getLogger(__name__)
+    base_url = f'https://{hostname}'
+
+    if bearer is None:
+        bearer = get_bearer(hostname, verify, username, password)
+
+
+    now = datetime.now()
+    end = now + timedelta(days=365)
+    end = end.strftime('%Y-%m-%dT%H:%M:%S.000Z')
+    url = base_url+'/cdm/certificate/v1/certificates/selfSignedCertificate'
+    certificate = {"version":"1.1.0","signatureAlgorithm":"sha256WithRsa",
+                   "subjectAlternativeNameList":[hostname], "privateKeyExportable": False,
+                   "links":[{"rel":"certificateConstraints",
+                    "href":"/cdm/certificate/v1/certificates/selfSignedCertificate/constraints",
+                    "hints":None}],
+                   "certificateAttributes":{"commonName":hostname},
+                   "keyInfo":{"keyType":"rsa","keyStrength":"bits2048"},
+                   "validity":{"toDate":end},"state":"processing"}
+
+    headers = { 'Authorization': f'Bearer {bearer}' }
+
+    r = requests.patch(url, headers=headers, data=json.dumps(certificate), verify=verify,
+                              timeout=10)
+
+    if r.status_code != 204:
+        logger.error('Impossible to create a self-signed certificate. Error code: %d',
+                     r.status_code)
+        sys.exit(-1)
+
+    logger.info('Self-signed certificate created successfully.')
+
 
 @typechecked
 def get_certificates(hostname:str, verify:bool, username: str, password: str, 
@@ -496,7 +531,9 @@ def main():
 
     subparsers = parser.add_subparsers(dest='command', required=True, help='command help')
 
-    subparsers.add_parser('list', help='List certificates')
+    subparsers.add_parser('list', help='List certificates.')
+
+    subparsers.add_parser('self', help='Create a self-signed certificate.')
 
     parser_delete = subparsers.add_parser('del', help='Delete a certificate')
     parser_delete.add_argument("-#", "--number", dest='certid', required=True, type=int,
@@ -624,6 +661,9 @@ def main():
         case 'pem':
             install_certificate(hostname=args.hostname, verify=args.verify, username=args.username,
                                 password=args.password, filename=args.input)
+        case 'self':
+            self_signed(hostname=args.hostname, verify=args.verify, username=args.username,
+                        password=args.password)
         case _:
             logger.error('Unknown command: %s', args.command)
             sys.exit(-1)