---
title: "NTP Authentication sub-tab"
slug: "ntp-authentication-sub-tab"
updated: 2024-10-16T11:17:51Z
published: 2024-10-16T11:17:51Z
canonical: "docs.zpesystems.com/ntp-authentication-sub-tab"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.zpesystems.com/llms.txt
> Use this file to discover all available pages before exploring further.

# NTP Authentication sub-tab

NTP reduces security risks associated with time synchronization. With authentication, there is assurance a generated response is from an expected source (rather than maliciously generated or intercepted). Authentication applies a list of agreed keys (passwords) between a server and a client. Communication between server and client is encrypted with one of the agreed keys appended to the messages. The appended key is un-encrypted to ensure it matches one of the agreed keys. Only then is action taken. ![](https://cdn.document360.io/763c5fb1-b9af-4ccd-9ad6-cf28ae4cd5a3/Images/Documentation/image-1678297646659.png)

### Configure Key Number Set

This requires Admin privileges. Repeat the process for each key number set.

1. Go to *System :: Date and Time :: NTP Authentication*.
2. Click **Add** (displays dialog).

![](https://cdn.document360.io/763c5fb1-b9af-4ccd-9ad6-cf28ae4cd5a3/Images/Documentation/image-1678297799245.png)
3. Enter **Key Number** (any unsigned integer (range: 1 to 232– 1).
4. On **Hash Algorithm** drop-down, select one (MD5, RMD160, SHA1, SHA256, SHA384, SHA512, SHA3-224, SHA3-256, SHA3-384, SHA3-512).
5. Enter **Password** character string (space character not allowed). Alternatively, enter a hexadecimal number with prefix **HEX**followed by the number ######.
6. Click **Save**.

### Delete Key Number

1. Go to *System :: Date and Time :: NTP Authentication*.
2. Select checkbox next to Key Number to delete.
3. Click **Delete**.

### Link the NTP server and Key Number

1. Go to *System :: Date and Time :: Local Settings*.
2. Use separator '|' (pipe) between server address and its key number.

![](https://cdn.document360.io/763c5fb1-b9af-4ccd-9ad6-cf28ae4cd5a3/Images/Documentation/image-1678297769321.png)

> [!NOTE]
> NOTE
> 
> You can also add multiple NTP servers in the Server field. Enter comma-separated values without spaces.
3. Make changes, as needed.
4. Click **Save**.