Winners of the BH2013 #sophospuzzle - and how to solve it!

During the recent BlackHat 2013, we ran a #sophospuzzle
to test your problem-solving mettle.
The puzzle came in four stages:

• Crossword capers
• Algorithmic anguish
• Code conundrum
• Hindsight horror

Crossword solvers

The following 20 people sent in evidence that they had completed Stage One, the crossword:

@glendubb  [T]
Anonymous  [T]
@MrAdz350  [T]
Adam Mazack  [T]
@rbaranyi  [T]
Ian Collier
ColinM
@SecAdept
@smashmore
@Vampaerus
@sfolsson
Bob
@superponible
WJM
@abduelhamit
@bigEdog
josh_dawes
@dumbsoutherner
Adam J
rakso75

Those marked [T] won T-shirts.

Full puzzle solvers

Thirteen people submitted correct solutions to the entire puzzle, successfully wrangling it right to the end:

@pkosinar  [T]
Ian Collier  [T]
@rbaranyi  
@abduelhamit  [T]
@martijn_grooten
@sfolsson  [T]
@glendubb
Fred Bret-Mounet  [T]
@trapflag
---prize cutoff---
@superponible
Adam Mazack
@strawp
@hearth

Again, those marked [T] won T-shirts.
The last four solvers missed the deadline for the prize draw, but gamely decided to keep going anyway - nice work!

Prize winners

There were two Big Prizes.
The first was for BlackHat 2013 delegates who submitted their entries in person at the Sophos booth; the second was open to Naked Security readers everywhere.
The BlackHat winner was @trapflag.
He receives a Cubify 3D printer.
The Naked Security winner was @rbaranyi.
He receives a remote controlled 1/16th scale tank.
Well done.