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Comment by viraptor | Hacker News Reader

Calculate `h=SHA256(original_page)` and `n=len(original_page)`.

    do
      page = gen_random_bytes(n)
    while (h != SHA256(page))
    print page

It can be even generated client-side!

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Can't the same hash mean different data?

Well, sure. But if you add another check for likelihood that `page` is fairly-correct html in utf8, there should be around one correct result really :) If you get 2, the other one is probably a <form> you can use to sell your soul to satan - do not hit submit if you get it.

The problem with this, is that the random bytes in one iteration of the loop might be closer to the page than the next iteration, so there would be reverse progress in that instance. This entry would be disqualified.

    page_bytes = bytes(size_of(bytes_of(page)))
    do
      page_bytes += 1
    while (page_bytes != bytes_of(page))
    print page

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