# How Do I Check Software Package Integrity?

This section describes how to verify integrity of the DIS SDK software package on a Linux system by using a verification file.

#### Prerequisites

- The PuTTY tool is available.
- The WinSCP tool is available.

#### Procedure

1. Upload the DIS SDK software package dis-sdk-1.2.3.zip to any directory on the Linux system by using WinSCP.
2. Log in to the Linux system by using PuTTY. In the directory in which dis-sdk-1.2.3.zip is stored, run the following command to obtain the verification code of the DIS SDK software package:

   sha256sum dis-sdk-1.2.3.zip

   Example verification code:

       # sha256sum dis-sdk-1.2.3.zip
       8be2c937e8d78b1a9b99777cee4e7131f8bf231de3f839cf214e7c5b5ba3c088 dis-sdk-1.2.3.zip

3. Open the DIS SDK verification file dis-sdk-1.2.3.zip.sha256sum and compare it with the verification code obtained in 2.

   - If they are consistent, it indicates that the DIS SDK software package is not tampered with.
   - If they are inconsistent, the DIS SDK software package is tampered with and you need to obtain an untampered package.

Parent topic: FAQs