January 9, 2021

File hashing questions

I understand what hashes are/how to check a hash a file with Powershell.

Can someone explain why file hashes are often provided next to programs downloads?

Evidently it’s to verify the integrity of the file but wouldn’t you need to download file in order to hash it? So if the file was malicious/altered you’ve already downloaded it and could be compromised.

What am I missing?

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