Category: Communications & Receivers

Three Letters Re: COMSEC: One Time Pad Generation

Sir: I agree with the response posted, and your reply. While older versions of Perl used relatively poor pseudo-random number seeds, the original author’s use of a time (at runtime) index as a pseudo random number (PRN) generator seed is a reasonably “secure” method of generating a series of PRNs. That was the first thing I looked for in his code, and such a method would be secure given the caveats you suggest. (That is, it won’t be up against true high-power cryptanalysis). If applied with random letters instead of words as suggested, (like a “real” one time pad), it …


Letter Re: COMSEC: One Time Pad Generation

Hey Jim: I am a little concerned about yesterday evening’s post by B.R. regarding the generation of one-time pads. It claims to generate a “pad” using a random selection of dictionary words. A properly generated one-time pad requires a truly random selection of letters; it is only as strong as the source of entropy. Using a dictionary of English language words, acronyms, etc. does not seem to be very wise. Additionally, while I am not terribly familiar with Perl, I know that a lot of languages have built-in “random” functions that are not as random as one might hope for; …


COMSEC: One Time Pad Generation, by B.R.

While re-reading the ‘Radio Ranch’ chapter in JWR’s novel “Patriots“, I started thinking about the Book Code method versus a One-Time Pad. I went through the books on my shelf, and noticed the lack of duplicate books; the number of ‘common’ books; and how many of my books I figured would be in the Uncle Sam’s cracked book repository. At that point I thought I’d be SOL when trying to setup a secure method of communication. Being an ex-Army Infantry turned computer geek and prepper, I figured it would be much easier to write some code to generate pages of …


Letter Re: Antenna Launching Alternatives

CPT Rawles:s I know this is a very obscure topic, but having been a communication guy on a Special Forces A Team for many years and a ham radio operator, I know a couple things about wire antennas in trees. I’ve tried them all, slingshots, bow and arrow, lead weight, one-quart canteens et cetera. The problem is getting the right weight to mass ratio – otherwise you either can’t get the rope up high enough, it gets caught up in the branches or wraps around the branch you are throwing at. The single best object I have found is an …


Two Letters Re: Blending In–Unremarkable and Invisible Architecture

Sir, Happy Independence Day to you and your family. Concerning underground tanks for fuel storage, most states require both lining systems and cathodic protection to prevent leakage into the ground and or ground water. I fully agree with the defensive sense, being a veteran of the US Army and most of my time serving in the Infantry, having prepared many a defensive position.   As such for OPSEC, finding a discreet contractor may present a challenge, and of course the local county may get interested, Hopefully not too much. – Grog   JWR Replies: Cathodic zinc anodes (commonly called “sacrificial …


Electronics for Mobile Self Sufficiency, by Blue Sun

I believe that the ultimate survival strategy for the ultimate collapse of civilization goes far beyond simply fortifying and stocking a retreat and locking yourself into a potential box canyon, I believe that the last resort for survivors is to develop the skills and knowledge to exist for years, or even for the rest of your life, in the most extreme and remote areas as a hunter-gatherer with nothing in terms of equipment except what you can carry on your back. So, here I will present part one of my must-haves for total self-sufficiency: self-contained electronic tools that can be …


Letter Re: TOR and the Onion Networks

The Onion Routing (TOR or Tor) project is one of the best ways to stay anonymous on the web. The project was initially funded by the Navy, but over a few years evolved into a non-profit organization. The goal of the TOR project is twofold: to allow for the anonymous browsing of the internet, and to allow people to connect to the .onion network. This is a basic illustration of how it works is this. Lets say every internet site you visit is a store front in a basic town. You go in and out of stores in the daylight. …


Letter Re: Vacuum Tube Radios for Preppers

Jim: A lot of us got the radio bug from a Hallicrafters S-38 series or a Zenith Trans-Oceanic. I have both and still enjoy them, but when I need to tease out an obscure signal my old National HRO usually beats about any other radio in the shack (new or old) hands down. The S-38 is a good choice since outside of the band-switching arrangement it has the guts of an All-American Five radio. This makes it a lot more repairable, most of the components are “generic”, i.e. tubes, capacitors, IF transformers, et cetera. The only downside to a [transformerless] …


Our Community-Wide SHTF Contingency Plan, by T.M.

We are located in the Southeastern United States. There are nine families in our “block”, with the next neighborhood or community more than two miles away. I refer to it as a block because a major highway runs through it. The only dwellings on the major highway are three houses and one country store. The rest are on a “U” shaped secondary road that starts across from the store on the main highway and ends, back on the main Highway, 1 mile east, at a cross road. We are all contained in one square mile within that “U”. I should …


Vacuum Tube Radios for Preppers

I often have SurvivalBlog readers write to ask me about vacuum tube technology and its robustness in EMP and CME events, and which antique multi-band vacuum tube radios to look for. I’m also asked how to determine which models can be run on both AC and DC power. To begin, vacuum tubes are inherently “hard” to EMP and CME but not invulnerable. They are also relatively safe from lightning strikes–but again not invulnerable. Modern integrated circuits are at the opposite end of the scale for vulnerability. In essence, the smaller gates in a microcircuit, the greater its vulnerability. In recent …


Letter Re: Survival Electronics and the Lowly Vacuum Tube

James: This is in response to an earlier letter where a reader asserted that his knowledge as an electronics engineer will be of little use after TEOTWAWKI. He is wrong, we will not abandon all the technology invented over the past 100+ years. Say for example we are hit with the big solar event, several EMPs and most solid state electronics are destroyed. One component that will survive is the vacuum tube. There will still be means to generate electricity here and there that will not be affected, hydroelectric generators will still spin, steam turbines, some of these can be …


Letter Re: Keeping Your Communications Private

Jim, I would like to offer a suggestion and a word of caution concerning F.J.B. suggestions for secure and private communications. The suggestion is the computer media containing the data.  Instead of trying to find a small thumb drive or a thumb drive in some nondescript package, one should look at the MicroSD card.  These generally come with an SD card carrier and SD card writers are inexpensive and small.  Once removed from the carrier, the MicroSD card measures only 11x15x1 mm (.43x..59x.04 inches) and is available in sizes up to 64 GB.  This extremely small gadget can easily be …


Survival Electronics, by M.B. Ham

As an electronics and computer engineer for the past 30 years my personal skill sets are of limited but interesting value after TEOTWAWKI. Given that there may be very limited electricity, and/or the fact that CME/EMP may destroy most electronics devices, the need for these skills may be rare. I feel that these skills will be mostly useless unless you are part of a sustainable group of retreatists that have electricity and devices that use it. I plan to be part of such a group, and so I am planning ahead to make sure that my skills can be applied …


Two Letters Re: Keeping Your Communications Private

Sir: After reading the recent SurvivalBlog article on “Keeping Your Communications Private” I went on eBay to see an endless variety of Flash drives that are very small and very camouflaged as to what they are. My wife and I will be going on a cruise later in the year and one of the cruise line’s suggestion is a flash drive to store copies of important documents.   I already do this for my BOB but I wanted something that we could carry that does not look like a flash drive. There were several options available at varying prices. I …


Keeping Your Communications Private, by F.J.B.

In this age of continuing disregard for an individual’s privacy, it can be difficult to keep your communications private. Warrant-less phone taps, postal service mail tracking, RF scanners,  and random roadside searches will appear fairly tame once the strip-searches start at the mall. Of course, this is their goal but even non-government snoopers are out there scanning your ID, listening to your phone calls, and trying to hack into your email. Going somewhere? Who knows your schedule? Did someone overhear your plans? How can you know? What has happened to our right to privacy? Many people today are so beaten …