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Auto-incrementing ids makes guessing subsequent or previous items trivial. There was a post here a few weeks ago about it -- https://news.ycombinator.com/item?i

• slavik81 6y ago
  That doesn't seem like it would matter much on its own. You can pretty easily guess HN item IDs, too. e.g. https://news.ycombinator.com/item?id=25244871 https://news.ycombinator.com/item?id=25244871 and https://news.ycombinator.com/item?id=25244873 https://news.ycombinator.com/item?id=25244873
  • sonofhans 6y ago
    Of course you’re right — nothing matters on its own. It’s one possible factor in a defense in depth strategy —- https://en.wikipedia.org/wiki/Defense_in_depth_(computing) https://en.wikipedia.org/wiki/Defense_in_depth_(computing)