How to Verify the Authenticity of a Windows ISO Image

Before installing Windows from an ISO image, it’s crucial to ensure its authenticity and integrity to avoid potential security issues or installation errors. In this article, we’ll cover the main methods for verifying the authenticity of Windows ISO files.

1. Check the Hash (Checksum)

A checksum is a unique code generated based on the contents of a file. Popular algorithms for checksum verification include MD5, SHA-1, and SHA-256. By comparing the checksum, you can verify that the file has not been altered after download.

Steps for Verification:

  • Download the ISO image from the official Microsoft website or another trusted source.
  • Locate the official checksum values provided on the download page of the website.
  • Use tools like CertUtil (built into Windows), HashTab, or WinMD5 to calculate the hash of your file.

Example using CertUtil:

CertUtil -hashfile path_to_file.iso SHA256

Compare the obtained hash value with the original one. If they match, the file has not been altered and is authentic.

2. Check the File’s Digital Signature

Official ISO images downloaded from Microsoft often include a digital signature that verifies the file’s authenticity. To check the digital signature, follow these steps:

  1. Right-click on the ISO file and select “Properties.”
  2. Go to the “Digital Signatures” tab.
  3. Select the signature and click “Details.” Ensure the signature status is “Valid.”

If there is no signature or if the signature status is “Invalid,” the image may be corrupted or fake.

3. Use Microsoft’s Media Creation Tool

The easiest way to get a genuine Windows ISO image is by using Microsoft’s Media Creation Tool. This utility downloads the image directly from Microsoft’s servers, eliminating the risk of tampering.

Steps to Use:

  • Download and run the Media Creation Tool.
  • Select “Create installation media” and follow the on-screen instructions.
  • Choose to save the file as an ISO image.

This way, you will receive a guaranteed authentic and up-to-date Windows image.

4. Scan for Viruses

After downloading the ISO file, it’s always a good idea to scan it with antivirus software. Use tools like VirusTotal to check the file for any viruses or malware. This adds an extra layer of protection and helps detect potential threats.