How does verifying the checksum confirm the integrity of a downloaded file, when it’s posted on the same website the file came from?
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The idea is that if you downloaded the file from somewhere else rather than the official website you can check that it is still the same as the one on the website by comparing the checksum.
The checksum is something you get from doing math on the original file.
You can put the file you downloaded through an algorithm to see what it’s checksum is and if it is the same as posted online it is likely genuine.
If you change the input, in this case the original file you change the output, in this case the checksum.
Creating a new file with the same checksum is possible, but doing so that it still resembles the original enough to get mistaken for it, is quite hard.
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