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If they are simply hashed, rainbow tables can be used to crack them. Password must be salted preferably using bcrypt or something equivalent.

A rainbow table is not necessary to crack passwords, and is not able to crack all passwords (even if not salted).

And even if salted, a regular (non-rainbow table) attack will crack some passwords.

They state thatthey weresaltedin the blog post, however, they do not specify through what method.