Please note that the body of this puzzle has succumbed to linkrot, and is possibly lost forever! To my recollection, visiting the link would take you to an ascii art infinite scroller; at the top was a message along the lines of
find d4e93d, however repeated scrolling seemed to get us nowhere (in fact because reaching the end would require us to go about a million pages down!).
author: Daniel Low
The instruction cues the association with hashes.
On inspecting the source we see that the next page is given by
Which suggests that we should compute the hash chain until it starts with d4e93d.
This can be done by writing a short program to compute the required hash
import md5 limit = 10000000 target = "d4e93d" m = md5.new() m.update("puzzlehunt2015") x = m.hexdigest() while (limit > 0 and x[:6] != target): m = md5.new() m.update(x + ".puzzlehunt2015") x = m.hexdigest() limit -= 1 print(x)
The program should produce the correct hash:
By going to
generate.php?id=d4e93d37cbcdf367d77c993b85abe792.puzzlehunt2015, we see that the solution