diff --git a/src/main/java/it/pagopa/swclient/mil/idpay/azurekeyvault/util/EncryptUtil.java b/src/main/java/it/pagopa/swclient/mil/idpay/azurekeyvault/util/EncryptUtil.java
index fb34c02..dee9ba7 100644
--- a/src/main/java/it/pagopa/swclient/mil/idpay/azurekeyvault/util/EncryptUtil.java
+++ b/src/main/java/it/pagopa/swclient/mil/idpay/azurekeyvault/util/EncryptUtil.java
@@ -7,19 +7,19 @@
 import javax.crypto.Cipher;
 import javax.crypto.IllegalBlockSizeException;
 import javax.crypto.NoSuchPaddingException;
+import javax.crypto.spec.OAEPParameterSpec;
+import javax.crypto.spec.PSource;
 import java.math.BigInteger;
-import java.security.InvalidKeyException;
-import java.security.KeyFactory;
-import java.security.NoSuchAlgorithmException;
-import java.security.PublicKey;
+import java.security.*;
 import java.security.spec.InvalidKeySpecException;
+import java.security.spec.MGF1ParameterSpec;
 import java.security.spec.RSAPublicKeySpec;
 import java.util.Base64;
 
 @ApplicationScoped
 public class EncryptUtil {
 
-    public String encryptSessionKeyForIdpay(PublicKeyIDPay publicKeyIDPay, String sessionKey) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
+    public String encryptSessionKeyForIdpay(PublicKeyIDPay publicKeyIDPay, String sessionKey) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException, InvalidAlgorithmParameterException {
         String modulusBase64 = publicKeyIDPay.getN();
         String exponentBase64 = publicKeyIDPay.getE();
 
@@ -37,8 +37,10 @@ public String encryptSessionKeyForIdpay(PublicKeyIDPay publicKeyIDPay, String se
         KeyFactory keyFactory = KeyFactory.getInstance("RSA");
         PublicKey rsaPublicKey = keyFactory.generatePublic(rsaPublicKeySpec);
 
-        Cipher cipher = Cipher.getInstance("RSA/ECB/OAEPWithSHA-256AndMGF1Padding");
-        cipher.init(Cipher.ENCRYPT_MODE, rsaPublicKey);
+        Cipher cipher = Cipher.getInstance("RSA/ECB/OAEPPadding");
+        OAEPParameterSpec oaepParams = new OAEPParameterSpec("SHA-256", "MGF1",
+                new MGF1ParameterSpec("SHA-256"), PSource.PSpecified.DEFAULT);
+        cipher.init(Cipher.ENCRYPT_MODE, rsaPublicKey, oaepParams);
 
         byte[] sessionKeyBytes = decodeBase64UrlOrBase64(sessionKey);
         byte[] encryptedSessionKeyBytes = cipher.doFinal(sessionKeyBytes);