I totally disagree with your conclusions as applied to this particular application. I think having a (reliable) duplicate file finder built right into CCleaner is an excellent thing, but at the moment it just isn't. I'm sorry if I'm sounding overly critical/negative. You need to use a proper hashing algorithm, such as MDx or SHA-x.
It's not an issue of mathematics, it's an issue of maliciousness (and fundamentally design). Not even CRC32, this is simply not suitable. It's just these sorts of suspicious files you might want to verify. I've seen on numerous occasions, through either malicious 'cleverness' or simply quirks of design, DISTINCT files that share the same CRC32 but clearly not the same MD5/SHA-1.
To have an even half way proper duplicate file finder, the mechanism for identifying such files MUST be some sort of hashing algorithm *as a CRC32, this is simply not suitable. I completely agree with Keatah and 4NTFan.Īs a long time fan of CCleaner I was excited to see this new feature added, but in its current implementation it's beyond useless.
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