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Re:Blog post id enumeration can lead to unwanted information... by dchest on Monday February 29, 2016 @04:56AM (#11194531)
The are not secret and not unguessable, they use some homegrown cipher, calling the result of encryption a "hash" for some reason (http://carnage.github.io/2015/08/cryptanalysis-of-hashids/)
Re:Blog post id enumeration can lead to unwanted information... by yetanothercoder on Monday February 29, 2016 @09:31AM (#11195613)
It's for search/seo reasons.

http://hashids.org/#why-hashids