The Pad-O-Matic Prints One-Time Pads On Demand

Like many obsessions, I have an interest in Encryption The roots in wartime exploits of the Breaker code and Ur– Computer world Alan Torring. So I continued with interest IEEE SpectrumReporting In the prosperous field Postquantum encryption. These techniques are designed to thwart even enormous possible to Quantum, technology Light years exceed the electromechanical bombe Torring Used to break German puzzle Crafts. I am sure that these new encryption methods will take place a job Whatever. But there is one Encryption Plan, known even in Torring timeThis is a sporting believe against not only Quantum computers but any The computer that will be invented at all: one -time board.

One time plate is a series of letters or random numbers-250 number. Both the sender and the future contain a copy of the plate, which is used for both encryption and encryption, by following some Simple but strict rules for pen and paper. It is an encryption in which the key changes in an unpredictable way after each letter. Without the ability to predict, there is nothing for an attacking computer that it Teeth in.

However, most of the novice code possesses two encoded messages with the same painting will be able to strip the encryption and read both. So it is necessary to destroy every pillow after using you He – she. It is a bad idea to store the pillow on Thumb Or something similar, because Computers and storage Devices They have a habit of leaving residue Data About, even after Data It was officially deleted.

One -time pillow comes with some other important restrictions. The numbers should be truly Random-numbers resulting from false randomness Algorithms Computers usually use them. And because you can use a specific pillow only once, you need a full set of it if you want to send more than one message. In addition, it should be printed physically and shared by hand – you cannot send it via a network.

random number Generator Uses a set of 74HC series logic Chips [top right] For digitization electrical Noise And presented it randomly to Erdino Uno Minima [top left]. The generator can produce one byte almost every 200 microscopic, and Uno converts this to one number He builds a series of 50 pillow with 250 numbers each, which he sends to the printer [bottom].James Provest

I decided to build a machine that makes dealing with these problems a little easier. Pad-O-Matic has been built around CSN-A2 thermal receipt printer I bought a whims a few years ago. The printer is connected to the most transparent technology stack that I can find: A Tolded TransistorA few Logic chipsAnd Controlled With around 200 lines of my code. this code Nothing is more complicated than division, because if you learn one thing about encryption, it is that unless you really know what you do, then an attempt to have smart plots is a recipe for to fail. PAD-O-MATIC is completely independent.

the thermal The PAD-O-MATIC printer allows me to print a full chain of pads. I still have to share the pillows physically, but at least in a built -in roll. My correspondence is then, it can tear and destroy every pillow after using it.

Without the ability to predict, there is nothing for an attacking computer to enter its teeth.

You still need a good source of randomness – some of the irreplaceable material process is mainly to convert into unexpected parts of equality. Fortunately, this problem has already been solved for me. I found A small battery circuit from Make: magazine It depends on the electrical noise produced by the effect Electrons The wrong road through the transistor base and the Baath stations, leaving an unintended mosque station. Make:S Simplist of the circle by Aaron Logue, however Make: Fortunately it has a copy of the original planning. This uses 12 and 5 Volt Instead of 18 and 5 volts used by Make:A copy, so I can use old power I also had an additional additional current to pay the thermal printer. The original circuit also contains two nice additional features for the cost of some additional chips.

the Firstly The feature is a clean controller Interface. One by one at one time is sent in parallel, and a controlled alert every time it is available by a new byte. An alert is needed because the time needed to create a random vary is slightly different due to the other gentle feature: automatic CoordinationUsing four points of face and xor gate. Coordination It means that even if the electric noise generator tends towards, for example, more than 1S, the final product will be statistically balanced.

PAD-O-MATIC Electrical Approach Samples at regular intervals to create a stream of bits. To prevent the final numbers from bias towards those who have many 0S or 1S, pairs of bits are compared. Only if they differ, it is more examined, with the pioneering number. Eight of these exposed bits are filled in bye, then subject to Units A section for the production of a random number Between 0 and 9.James Provest

For my control, I finally got using Arduino Uno R4 Minima. Although this latest version of the beloved Uno came out about 18 months ago, I have not found a project that he needs – so far. Her larger memory – 32 kilograms of ram reverse 2 km in ReV3-You are necessary, because PAD-O-MATIC must generate a whole series of towns -50 in my case-ownership memory. With 250 numbers per pillow, this requires more than 12 km. Because the numbers only live in the RAM, there is no risk They leave any trace of themselves behind them.

Microcontroller produces numbers of random bitules by throwing first, i.e., with a. value More than 250. Then he performs Standard division By 10 on each remaining byte, leaving the numbers within 0 to 9.

I chose 50 pillow for each series, although I got the memory for more, because I actually have to print one series to keep it and a copy to share it, then create and print another series and copy it: The first series is to send messages from me to my secret correspondence, and the second series is to send messages to me. This eliminates the risk of using the same pillow accidentally when the messages cross each other. A total of 100 paddles around the use of one lap of thermal paper.

I put everything in a wooden container, and is appointed! When pressing one button, PAD-O-MATIC Whites lifePermanent spitting – and now more shockingly! protection.