You’ll use these checksums throughout the tutorial. While it’s downloading, take note of the MD5 and SHA1 sums next to the download link. Download the Ubuntu Minimal CD ISO for 64 bit PCs (amd64, x86_64). GPG SUITE SHASUM INSTALLWe’ll use an Ubuntu install ISO for our file verifications. You’ll need a file to verify, as well as the MD5 and SHA1 checksums for that file. Prerequisitesįor this article, you’ll use the command line tools for file verification that are built into every major operating system. GPG SUITE SHASUM HOW TOIn this tutorial, you’ll learn what file verification is, why it’s important, and how to do it on various operating systems using command-line tools. If a TCP packet was dropped during the download, the file you’ve downloaded may be just a hair off, and performing a file verification would let you know that what you downloaded is different than what is available on the source server. Though file verification can indicate that a file may have been hacked, it’s often more useful in showing the user that the file they downloaded is not quite right or has become altered during the download process. The hacked ISO had a completely different checksum than the original ISO. This dangerous install could have been avoided at the user level if the individuals who downloaded the altered ISO performed a file verification to see if what they downloaded had the same checksum as the original file. Before the compromised ISO was discovered, many people downloaded and possibly installed a version of Linux Mint with a backdoor baked in. On February 20th, 2016, the website for Linux Mint, a popular Linux distribution, was hacked and the ISO used to install the distro was compromised. Have you ever wondered what that checksum link was for? That checksum is used to verify the integrity of the file you just downloaded. You’ve probably downloaded some open-source software, such as a Linux distribution ISO, and next to the download link was a link to download a checksum of the file. The author selected the Electronic Frontier Foundation to receive a $300 donation as part of the Write for DOnations program.
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