sm-Fifteen

"What the heck is a Yubikey and why did I buy one?": A user guide

(EDIT: Besides Reddit, I've also put this up on Github Gist)

So while looking for information on security keys before getting one myself, I got very confused reading about all the different modes and advertised features of Yubikeys and other similar dongles. The official documentation tends to be surprisingly convoluted at times, weirdly organized and oddly shy about a few of the limitations of these keys (which I'm making a point of putting front and center). Now that I have one, I decided to write down everything I figured out in order to help myself (and hopefully some other people reading this) make sense of all this.

Since I'm partly writing these notes for myself, there might be some back and forth between "exp

j0sh

// Josh Allmann, 11 April 2013.
// Based on "The Gray Code Filter Kernels" by G. Ben-Artzi, et al.
// http://cs.haifa.ac.il/~hagit/papers/PAMI07-GrayCodeKernels.pdf
// to compile: gcc -o gck gck.c -lm

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

static int gck_gc(int a)

j0sh

# iOS builds for ARMv7 and simulator i386.
# Assumes any dependencies are in a local folder called libs and
# headers in a local folder called headers.
# Dependencies should already have been compiled for the target arch.

PROJ=untitled
ifeq ($(IOS), 1)
    ARCH=armv7
    DEVICE=OS
    CC_FLAGS=-arch $(ARCH)