DEFCON 21 badge hacking. Work in progress.
On the floor is a cypher for the 1930's novelette "Chain of Death". It reads "KEYWORDHMODOXIAN". Maybe an O is missing. Maybe we screwed it up.
https://www.defcon.org/1o57/dc21/homodoxian/ is a clue.
Another floor puzzle, the sun clock, can be decoded with rod numerals. https://www.defcon.org/1o57/dc21/orrery/ is a clue.
The cyrptogram on the top left of the sign outside the 1057 room reads: HAVE FUN NEED HELP JUST ASK PASSCODE SYZYGY
https://www.defcon.org/1o57/dc21/syzygy/ is a clue.
The symbols are also from "Chain of Death".
Queen cards might include Trinity, Acid burn, and Mouse.
Badges have playing card designs varrying by suit and number. On the back of each card is a string of numbers. These appear to be 2-digit numbers ranging from 01-26 which are ordinals into a mapping of the alphabet. The mapping is either the standard A-Z mapping or ROT-13, seemingly indicated by the suit. At least some of the sentence fragements are from Rush's Tom Sawyer.
Badges also have a 3-digit binary number on the back. Some badges also depict a simple number generator that produces the following sequences.
+-------+ v | | 000 (0) --+ 001 (1) <-+ 100 (4) | 010 (2) | 101 (5) | 110 (6) | 111 (7) | 011 (3) --+
e, pi and a circular icon also appear on different suits instead of the circuit. http://en.wikipedia.org/wiki/Euler%27s_identity could connect them.
13-525DSK ROTTHIQTEENPROBABLYISNTRIGHT 07-525DSK BUTTHISISFUNRIGHT 10-525DSK THOUGHHISMINDISNOTFORRENT A-525DSK DONTPUTHIMDOWNASARROGANT 05-525DSK HISRESERVEAQUIETDEFENSE 12-525DSK RIDINGOUTTHEDAYSEYENTS 11-525DSK CATCHTHEMISTCATCHTHEMYTH 02-525DSK CATCHTHEMYSTERYCATCHTHEDRIFT 02-KEYHOL THESKYSWI 07-KEYHOL LLCLEARUP 13-KEYHOL NOTINBLAC 11-KEYHOL KANDWHITE 05-KEYHOL BUTSHADEO 10-KEYHOL FTHEBITSH A-KEYHOL ELPYOUTUR 12-KEYHOL NTHISKEYX A-ROTARY INTHEREALORDERTHE 11-ROTARY FIRSTISTHELASTBEE 05-ROTARY XCLUSIVEORHASITRE 07-ROTARY GISTEREDTHATTAPAT 13-ROTARY ZEROANDONEWILLBEA 02-ROTARY LLTHEFEEDBACKYOUN 10-ROTARY EEDINTHEREALORDER 12-ROTARY THEFIRSTISTHELAST 07-SMILEY ROTTHIRTEENCANBEFUN 10-SMILEY BUTSOMETIMESLEADSASTRAY 05-SMILEY TRYSOMETHINGELSE 02-SMILEY ANDYOUWILLSEE 12-SMILEY THATFINDINGANSWERS 11-SMILEY MAYTAKEYOUDOWN 13-SMILEY PATHSNOTOFTENREPEATED A-SMILEY NOTALLWHOWANDERARELOST