Clues maybe? Here they are in case you were not able to get them last weekend. Found at the bottom of a few Defcon posters, they were easy to miss. Unless, you ran into a small crowd staring at them...
Top Row: 35 4 24 4 29 4 104 62 33 104 4 56 24 47 62 33 104 4 56 24 47 62 69 4 16 47 62 64 104 56 84 4 73 4 84 69 84 24 24 58 35 64 104 99 64 29 56 24 47
Bottom Row: 62 69 4 84 11 35 99 4 62 4 104 99 4 4 56 4 84 33 16 58 69 94 4 69 69 33 39 4 104 99 4 62 4 99 24 45 24 4 69 104 99 47 1 24 11 99 24 62 62 24 62
Here's a picture of how it looked like on the poster itself Defcon 19 Poster
