One of the toughest transmitters to direction find is that of an unauthenticated, WiFi client. Without being attached to an access point, a WiFi client may only send out a transmission, or probe request, once every 5 minutes. It is not uncommon to see requests sent every 20 minutes. There are ways to expedite the …
In a previous article (which you really should read before going any further), I detailed how one could use a particular transmitter, the Adafruit Feather LoRa 433MHz transmitter, to produce all manner of signaling types. To round out the experience, I’ve bought the other 3 ISM band transmitters Adafruit has on offer. I’ve updated and …
“Make us a transmitter for training.” This has been one of the single most requested items since I’ve been in business. Unfortunately, there has been no easy answers. I’ve tried a number of different approaches but nothing seemed robust enough or cost effective enough for the average tech to produce. There are many RF chips …
This tutorial explains how to control the duty cycle of the 555 timer’s output. Not only does this design control the duty cycle but the frequency remains relatively stable during the adjustment. This is helpful for a number of applications such as working with pulse width modulation. Schematic: Formulas in the Video:
Before we get started, you should know I am not pushing my own bug sweeping services. I do not sell my services commercially. I have 15 years of experience in technical surveillance countermeasures (TSCM) and am often called upon to give advice regarding many aspects of this profession. I gain nothing from this article other …
The objective of my career has been pretty simple up until recently. Bad guys want information X. Keep bad guys from taking information X. Simple enough. There’s also an Appendix to that objective. Bad guys always want to take information X. Build a program to stop bad guys from taking information X. Routinely check the infrastructure …
Knock off those network analysis cobwebs by downloading the file below and taking part in the Wireshark VoIP challenge. This a a short capture but a tricky one. Wireshark PCAP File MD5 Hash: 139b7dfea64ee097a4a415ba320cc5b6 The Challenge I’m currently putting together a new VoIP class and came across a nasty little Linux program that can manipulate VoIP …
The WiFi Pineapple is a very evil rogue access point (AP) that can quite easily trick an unsuspecting WiFi enabled device or user into connecting to itself. It does this mainly through a suite of programs called PineAP. Thanks to the makers of the WiFi Pineapple, Hak5, their website is full of Get Started tutorials …
It’s been about a year since my last tutorial. Over the last year I learned that teaching in the real world will take away time from teaching in the virtual world. Many people have contacted me asking about a tutorial for the 555 timer in Monostable mode. The great thing about this mode is that you …
This is the kind of stuff I love. Recently I was given a GPS tracker from an individual. This tracker had been embedded in a victim’s car for 6 years. The following video examines the tracker’s components and method of install. Below the video you’ll find some close-up photos of the device. GPS Tracker Photos …
