I recently downloaded an ISO file, and the SHA256 hash matches the one provided by a trusted source. I'm curious, is there any way to manipulate the ISO file while keeping the hash the same? Thanks for your insights!
5 Answers
There are currently no known hash collisions for the full SHA256 algorithm, so it's very unlikely one will be found anytime soon. You can trust it for security-related purposes.
SHA256 is extremely reliable for ensuring file integrity. In practical terms, if you alter the file, the hash will definitely change, so there's no way to manipulate the ISO without affecting the hash.
Theoretically, it’s somewhat feasible to engineer a collision, but practically it's unlikely to be accomplished, even with advances in quantum computing. SHA256 is a solid choice for current cybersecurity.
The reliability is quite high. You can even test it with something simple, like a notepad file. If you change a single character, the hash will be different. This demonstrates how sensitive the hashes are to any alterations.
If the hashes are considered trusted, then the chances of collision with SHA256 are practically zero, making it a safe option.
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