OH8STN: Raspberry Pi Field Computer – Off Grid Communications

Julian, OH8STN, has added another video to his Off Grid Communications series. This one is on the Raspberry Pi field computer he has been working on for a while.

The video starts off with an overview of my raspberry pi field computer, the QRP GoKit used in the field test, and some of the reaities of field communications when off grid. The video then moves on to discuss the reality of off grid field communications, and why we need to be smarter operators, with smarter yet easy to maintain gear.

OH8STN: Ultimate Raspberry Pi Build for Amateur Radio

Julian, call sign OH8STN, posted a new video last week about Ultimate Raspberry Pi Build. He uses the AmRRON Raspberry Pi scripts for part of the process and praises their work. Julian is using the Raspberry Pi with his radio to build a very light and portable radio communication system that could be used for emergency response operations or just for fun, portable operation.

Hello Operators.
Each of us has a different idea about what the ultimate raspberry pi build would be or look like. For my station, reducing the cable mess, replacing a large audio interface with a low-cost usb audio codec, and creating a lightweight, energy-efficient configuration for ham radio data mode operations. Also important was getting my raspberry pi to work off os 12 volts, just like my Yaesu FT-818 and Yaesu FT-891. In this video, we will go through all the hardware, hardware mods, hats, and software used to make this station the ultimate rasberry pi build for ham radio data modes in the field.

73, Julian #oh8stn

Brushbeater: True Random Numbers How-To

NC Scout has posted an article at his Brushbeater blog from one of his readers about how to generate true random numbers (as opposed to pseudo-random numbers and non-random numbers) for one time pad (OTP) encryption – R-Pi OTP/DRYAD True Hardware RNG How-To. It is lengthy and technical, but does a pretty good job of walking you through setting it up on a Raspberry Pi computer.

There are only three ways that I know of to generate a truly random One Time Pad – for the “regular guy”: 1) The old-fashioned way with a set of dice (preferably 10-sided) and paper/pencil; 2) purchase one of AmRRON’s ADL-1 units from AmRRON.com (https://amrron.com/2018/03/18/amrron-dark-labs-otp); 3) The following method outlined in this how-to. Maybe there are others. I wanted to come up with a way for anybody to put one together with easily available components. So here it is. You shouldn’t need to procure any unobtainium to build it. (It was valid in May 2018 when I first put this together. It should be fine as Raspbian Stretch is still the current distribution.)

The script will print either numerical or alphabetic OTPs. Besides the standard OTP generating scripts, also included is a script for generating a DRYAD-type table (it does not have the formatting options of the OTP script) and a special, limited-use/audience OTP script for split keys and variants at the end of this how-to.

This how-to also includes a procedure for building an SD card from scratch purely for the production of secure OTPs. Prior to that is some helpful info for those who are interested. If you wanted to build a good OTP generator, then this is for you…

Click here to read the entire article at Brushbeater.