HOWTO Check File Integrity?

How do you verify the integrity of file you downloaded from the Internet? If you’re using Windows 7/10 Operating System, here’s a simple step by step guide.

  1. Download the File Checksum Integrity Verifier (FCIV) utility installer KB841290 from Microsoft website e.g. Windows-KB841290-x86-ENU.exe
  2. Install FCIV. I normally save to my c:\tool folder. Of course, you can save it to whatever folder you prefer. I just want to be organize a little.
  3. Then, I run “fciv [filename of file to check the integrity] -sha1“. I compare the result to the SHA1 information from the website, if they are match the file integrity is intact.

Here’s an example.

I downloaded the GPG4Win (gpg4win-2.3.3.exe) packages and check the SHA1 checksums (67e13c4f90ff6a70ad57bd31af64a238c9315308) on their website e.g.

SHA1 checksum
67e13c4f90ff6a70ad57bd31af64a238c9315308 gpg4win-2.3.3.exe
71a3ed36a8af2ef14c7ac4d2d25fa2fef9eaa13b gpg4win-light-2.3.3.exe
a105cc82d60a315a14a4f69ea783a83baa434e55 gpg4win-vanilla-2.3.3.exe
46349916d17854e90bc9fe311b280af359350236 gpg4win-src-2.3.3.exe
5fa6d34206f3b08f1fdee58b03db1dc06c627388 gpg4win-2.3.3.tar.bz2

Using File Checksum Integrity Verifier (FCIV) I run the following command.

C:\Tools>fciv e:\tools\gpg4win-2.3.3.exe -sha1 [Enter]
// File Checksum Integrity Verifier version 2.05.
67e13c4f90ff6a70ad57bd31af64a238c9315308 e:\tools\gpg4win-2.3.3.exe

Then, I check if the checksum result is the same.

That’s it.

For Linux operating system, simply use gpg utility to check the integrity of file.


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