Hat Hash Hacking at DEFCON

You probably remember that for DEFCON I built a hat that was turned into a game. In addition to scrolling messages on an LED marquee there was a WiFi router hidden inside the hat. Get on the AP, load any webpage, and you would be confronted with a scoreboard, as well as a list of usernames and their accompanying password hashes. Crack a hash and you can put yourself on the scoreboard as well as push custom messages to the hat itself.

Choosing the complexity of these password hashes was quite a challenge. How do you make them hackable without being so simple that they would be immediately cracked? I suppose I did okay with this because one hacker (who prefers not to be named) caught me literally on my way out of the conference for the last time. He had snagged the hashes earlier in the weekend and worked feverishly to crack the code. More details on the process are available after the jump.

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DEFCON Shenanigans: Hack the Hackaday Hat

We don’t want to call it a challenge because we fear the regulars at DEFCON can turn our piece of hardware into a smoking pile of slag, but we are planning to bring a bit of fun along with us. I’ll be wearing this classy headgear and I invite you to hack your way into the WiFi enabled Hackaday Hat.

I’ll be wearing the hat-of-many-scrolling-colors around all weekend for DEFCON 22, August 7-10th in Las Vegas. You may also find [Brian Benchoff] sporting the accessory at times. Either way, come up and say hello. We want to see any hardware you have to show us, and we’ll shower you with a bit of swag.

Don’t let it end there. Whip out your favorite pen-testing distro and hack into the hat’s access point. From there the router will serve up more information on how to hack into one of the shell accounts. Own an account and you can leave your alias for the scoreboard as well as push your own custom message to the hat’s 32×7 RGB LED marquee.

You can learn a bit more about the hat’s hardware on this project page. But as usual I’ve built this with a tight deadline and am still trying to populate all the details of the project.

Roman Headgear Looks Less Silly With Lots of Blinky

centurion-project

Look, it’s not Steam-Punk because the period is way out of whack. And we’ve never seen ourselves as “that guy” at the party. But it would be pretty hard to develop The Centurion Project and not take the thing to every festive gathering you could possibly attend. This sound-reactive helm compels party-going in a toga-nouveau sort of way.

[Roman] tells us that it started as a movie prop. The first build step was to remove the plume from the top of it. The replacement — seven meters worth of addressable RGB LEDS — looks just enough like an epic mohawk to elicit visions of the punk rock show, with the reactive patterns to make it Daft. The unexpected comes with the FFT generated audio visualizations. They’re grounded on the top side of each of the LED strips. Most would call that upside-down but it ends up being the defining factor in this build. Seriously, watch the demo after the break and just try to make your case that this would have been better the other way around.

As a final note, this project was written using Cinder. It’s an Open Source C++ library that we don’t remember hearing about before.

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A blinky fedora to ring in the New Year

blinky-hat-for-new-years-eve

[Garrett Mace] decided to dress festive for New Year’s Eve. What he came up with is a fedora ringed in LEDs that react to music. The hardware uses 5050 LEDs on strips. Three of them encircle the head-gear providing a total of 114 RGB pixels. Each is a WS2811 module — a part which we’re seeing more and more of lately.

The video clip after the break starts off with a few minutes of demonstration. [Garrett] managed to code all kinds of animations for the hardware including several different styles of color sweeps and fades. You may start to think that the three bands always display the same patterns but keep watching and you’ll see a sparkle pattern that proves each dot can be addressed individually.

About 2:20 seconds into the video [Garrett] explains how he pulled it off and shows off the driver hardware. The strips are glued to a band of webbing that slides over the hat. The wires that drive the lights were fed through the center of some paracord and connect to an Arduino housed in a 3D printed case. Power is provided by a portable USB battery with a ShiftBrite shield and an MSGEQ7 chip complete the parts list.

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Thinking Cap is also Party Hat

The Thinking Cap is a piece of wearable signage that lets you display what’s on your mind. The hat uses a Teensy 2.0 connected to a Bluetooth radio to allow the wearer to update the message on the fly, letting the room know what their thinking at that instant.

This hack is based off of LPD8806 controlled LED strips, which are becoming very popular for adding lots of LEDs to anything. There are five strips that need to be controlled over SPI, but the Teensy only has one SPI peripheral.

This lead to the use of multiplexer to allow for controlling each strip individually. The hat uses an interesting and low cost scheme to multiplex five channels using two 744052 dual 4 channel multiplexors and a 7400 inverter.

The Teensy can receive messages using the Bluetooth serial port protocol. The 5 x 7 pixel characters are stored in a framebuffer, and shifted around the hat to create the animation.

The result is a bright message circling around the user’s head, which can be updated with a smartphone over Bluetooth. Check out a video demo of the hat after the break.

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Nyan Cat hat will be the hit of the party…. for about one minute

Seriously, this Nyan Cat hat is the only part needed for a fantastic Halloween costume. It looks pretty good in this still image, but we dare you to watch the clip of it in action (embedded after the break) without letting a beaming grin creep onto your face. Everyone’s going to just love this… until it starts to get really annoying.

When switched on, the iconic meme rotates around the headgear, bobbing its head and tail as she sings the song of her people. There are also stars made of white LEDs that twinkle very brightly in the process. The presentation is quite good, but even better is seeing the build process. Luckily [Ben Katz] posted a series of detailed articles during the adventure. The mechanism responsible for driving the cat around the hat was laser cut from acrylic. It includes a large gear with teeth on the inside, which is interface by a continuously rotating servo motor with a much smaller gear. The head and tail bobbing are purely mechanical, using the revolving motion to turn a spindle as the cat makes its way around the brim.

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Blinky headgear

This hat has a chasing LED feature thanks to our old friend the 555 timer. [BananaSlug] even built in the option to change the speed at the push of a button.

His design starts out with a costume hat. Each of the 25 LEDs is soldered to a 2×4 hole chunk of protoboard. The LED package is pushed through a slit in the hat, but the protoboard remains on the inside where it can be sewn in place. From there [BananaSlug] soldered one negative bus around the circumference, and an individual positive lead from each module back to the control board. They’re addressed by a set of CD4017 decade counters which are clocked by the 555 timer circuit.

This is a great little analog/logic project and the style is perfect if you’ve got the coat to go along with it.