# Raspberry Pi Thermal Printer One Time Pads ## Overview ![](https://cdn-learn.adafruit.com/assets/assets/000/010/481/medium800/raspberry_pi__JMD8529.jpg?1396906698) ## TOO MANY SECRETS In the climax to the hacker classic [Sneakers](http://en.wikipedia.org/wiki/Sneakers_(1992_film)), the good guys have to break in and steal a box which can decode anything. In real life, of course, such devices don't exist. But what if they did? Is there any type of encryption that will withstand a brute force attack by any amount of computing power? ![](https://cdn-learn.adafruit.com/assets/assets/000/010/468/medium800/raspberry_pi_IBM_Blue_Gene_P_supercomputer.jpg?1396906400) As it turns out, there is! Although, as we'll see later, unfortunately this doesn't readily translate into practical security. Still, thinking about security is a great habit to get into, and we can learn all kinds of great lessons by studying historical methods of encryption such as this one. So, without further ado, let's get started! To follow this tutorial you'll need an Adafruit Internet of Things Thermal Printer. If you haven't done so already, head on over to [http://learn.adafruit.com/pi-thermal-printer/overview](http://learn.adafruit.com/pi-thermal-printer/overview) and put one together! Then come back and learn a bit about the history of the one time pad, and how to print your own on your IoT printer! - [Next Page](https://learn.adafruit.com/raspberry-pi-thermal-printer-one-time-pads/a-crash-course-in-one-time-pads.md) ## Featured Products ### Adafruit IoT Pi Printer Project Pack [Adafruit IoT Pi Printer Project Pack](https://www.adafruit.com/product/1289) Build an "Internet of Things" connected mini printer that will do your bidding! This is a fun weekend project that comes with a beautiful laser cut case. Once assembled, the little printer connects wirelessly to get Internet data for printing onto 2 1/4" wide receipt paper.... No Longer Stocked [Buy Now](https://www.adafruit.com/product/1289) [Related Guides to the Product](https://learn.adafruit.com/products/1289/guides) ### Mini Thermal Receipt Printer [Mini Thermal Receipt Printer](https://www.adafruit.com/product/597) Add a mini printer to any microcontroller project with this very cute thermal printer. Thermal printers are also known as receipt printers, they're what you get when you go to the ATM or grocery store. Now you can embed a little printer of your own into an enclosure. This printer is ideal... No Longer Stocked [Buy Now](https://www.adafruit.com/product/597) [Related Guides to the Product](https://learn.adafruit.com/products/597/guides) ### Mini Thermal Receipt Printer Starter Pack [Mini Thermal Receipt Printer Starter Pack](https://www.adafruit.com/product/600) Hit the ground running (and printing!) with this starter pack that includes a thermal printer and all the extras and save a few dollars while you're at it. Includes: - [A mini thermal receipt printer](http://www.adafruit.com/products/597) - with cables and... No Longer Stocked [Buy Now](https://www.adafruit.com/product/600) [Related Guides to the Product](https://learn.adafruit.com/products/600/guides) ### Thermal paper roll - 50' long, 2.25" wide [Thermal paper roll - 50' long, 2.25" wide](https://www.adafruit.com/product/599) A mini roll of thermal paper, this fits very nicely into our mini thermal printer. 2.25" wide (about 57mm) and 50 feet long (15 meters). BPA-free. [Perfect for use with our mini thermal printer!](http://www.adafruit.com/products/597) No Longer Stocked [Buy Now](https://www.adafruit.com/product/599) [Related Guides to the Product](https://learn.adafruit.com/products/599/guides) ## Related Guides - [Sitcom SFX Door Trigger](https://learn.adafruit.com/sitcom-sfx-door-trigger.md) - [DHT Humidity Sensing on Raspberry Pi or Beaglebone Black with GDocs Logging](https://learn.adafruit.com/dht-humidity-sensing-on-raspberry-pi-with-gdocs-logging.md) - [Large Pi-based Thermometer and Clock](https://learn.adafruit.com/large-pi-based-thermometer-and-clock.md) - [Processing on the Raspberry Pi & PiTFT](https://learn.adafruit.com/processing-on-the-raspberry-pi-and-pitft.md) - [FONA Tethering to Raspberry Pi or BeagleBone Black](https://learn.adafruit.com/fona-tethering-to-raspberry-pi-or-beaglebone-black.md) - [Getting Started With Windows IoT Core on Raspberry Pi](https://learn.adafruit.com/getting-started-with-windows-iot-on-raspberry-pi.md) - [Matrix and 7-Segment LED Backpack with the Raspberry Pi](https://learn.adafruit.com/matrix-7-segment-led-backpack-with-the-raspberry-pi.md) - [Using the BMP085/180 with Raspberry Pi or Beaglebone Black](https://learn.adafruit.com/using-the-bmp085-with-raspberry-pi.md) - [Using a Mini PAL/NTSC Display with a Raspberry Pi](https://learn.adafruit.com/using-a-mini-pal-ntsc-display-with-a-raspberry-pi.md) - [Adafruit's Raspberry Pi Lesson 7. Remote Control with VNC](https://learn.adafruit.com/adafruit-raspberry-pi-lesson-7-remote-control-with-vnc.md) - [CircuitPython on Raspberry Pi (Bare Metal / No OS)](https://learn.adafruit.com/circuitpython-on-raspberry-pi-bare-metal-no-os.md) - [Adafruit's Raspberry Pi Lesson 8. Using a Servo Motor](https://learn.adafruit.com/adafruits-raspberry-pi-lesson-8-using-a-servo-motor.md) - [SnapPiCam Raspberry Pi Camera](https://learn.adafruit.com/snappicam-raspberry-pi-camera.md) - [Internet of Things Printer for Raspberry Pi](https://learn.adafruit.com/pi-thermal-printer.md) - [16x32 RGB Display with Raspberry Pi - part 2](https://learn.adafruit.com/16x32-rgb-display-with-raspberry-pi-part-2.md)