title: Java public private key decryption issue
body: <p>I am trying to encrypt and decrypt a message as mentioned in the below code. Basically I want to encrypt a message with a public key and convert that encrypted message from byte array to String. And decrypt this string into original text. Here are the both methods. Here encryption works fine but decryption fails (error is "Data must start with zero"). I think this is causing because I convert encrypted byte array into String. <br> <br>
  How do I solve this? (I want to have encrypted byte array as string and use it for decryption) Is there any other approach (with public and private keys)</p>
  
  <pre><code>public static String getEncryptedMessage(String publicKeyFilePath,
  
      String plainMessage) {
      byte[] encryptedBytes;
      try {
          Cipher cipher = Cipher.getInstance("RSA");
          byte[] publicKeyContentsAsByteArray = getBytesFromFile(publicKeyFilePath);
          PublicKey publicKey = getPublicKey(publicKeyContentsAsByteArray);
          cipher.init(Cipher.ENCRYPT_MODE, publicKey);
          encryptedBytes = cipher.doFinal(plainMessage.getBytes());
          return new String(encryptedBytes);
      } catch (Throwable t) {
  
      }
  
  }
  public static String getDecryptedMessage(
          String privateKeyFilePath, String encryptedMessage)
           {
      byte[] decryptedMessage;
      try {
          Cipher cipher = Cipher.getInstance("RSA");
          byte[] privateKeyContentsAsByteArray = getBytesFromFile(privateKeyFilePath);
          PrivateKey privateKey = getPrivateKey(privateKeyContentsAsByteArray);
          cipher.init(Cipher.DECRYPT_MODE, privateKey);
          decryptedMessage = cipher.doFinal(encryptedMessage.getBytes());
          return new String(decryptedMessage);
      } catch (Throwable t) {
  
  
  }
  </code></pre>