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Really it's because of a mixture of the two. The traditional DES-based crypt is basically a really early KDF - it was intentionally designed to be slow in order to thwart brute-forcing attacks. (Of course, since it was based on the speed of late-70s computers and had a limited password length, it's pretty feasable to brute force with modern hardware.)

MD5 wouldn't be invented for another decade or two...






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