---
title: Manage OPC UA Policies
slug: bhdo/manage-opc-ua-policies
createdAt: 2022-09-26T16:07:10.000Z
---

You can enable and disable policies by navigating to** OPC **>** Management**.  

![](https://api.archbee.com/api/optimize/vAqK-046vdh4I0e1y9cfX/my2tb7Zm8ioK8_JpUbjMQ_image.png)



- **None**: No encryption type.
- **Sign**: Belden Horizon Data Operations signs messages from the server to assure recipients that the sender is authentic and not an imposter.
- **SignAndEncrypt**: Belden Horizon Data Operations both signs and encrypts messages from the server to prevent any attackers from reading plain text messages from the server.

![](https://api.archbee.com/api/optimize/vAqK-046vdh4I0e1y9cfX/S7a42IjQPaCpibmrf0qX3_image.png)

- **None**: No encryption type.
- **Basic256Sha256**: 256-Bit encryption. It supports Sha256 or stronger hash algorithms for certificates.
- **Basic256**: 256-Bit encryption. It supports the Sha1 and Sha256 hash algorithms for certificates.
- **Basic128Rsa15**: 128-Bit encryption that uses RSA15 as a Key-Wrap. It supports Sha1 or stronger hash algorithms for certificates.
- **Aes256\_Sha256\_RsaPss**: 256-bit Advanced Encryption Standard (AES) using the RSA Probabilistic Signature Scheme.  
- **Aes128\_Sha256\_RsaOaep**: 128-bit Advanced Encryption Standard (AES) using the RSA with Optimal Asymmetric Encryption Padding. 

# Restart OPC UA Server

After enabling or disabling a policy, you must restart the OPC UA Server. See [Manage the OPC UA Server](docId\:CvsDVJ9LeYzibOoRG89QD) to learn more.