VM Sandboxing Data

VM Sandboxing Data

In previous posts, VirtualBox sandbox creation was covered. VM exporting and importing were also covered as a way to migrate to new hosts. In this post I’ll be covering how to work with sandbox data. The data on a sandbox more often than not needs to remain isolated from other systems. This is a challenge when data needs to be placed on or retrieved from the sandbox. There are a few ways to do this, which we will cover here….

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VM Sandboxing with VirtualBox

VM Sandboxing with VirtualBox

Sandboxing is a term used to describe a computer environment that uses 1 or more computer systems that are logically separated from a production computer environment. The sandbox environment allows administrators to test conditions that will not influence the production environment. Unlike a lab environment that will replicate exactly what exists in a production one, sandboxing is primarily used to test behaviors. This post will cover how to use VirtualBox to create and operate a sandbox environment. It will not…

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Moving VMs in VirtualBox

Moving VMs in VirtualBox

In this post, I’ll be covering how to export and import virtual machines in VirtualBox. This will allow you to move VMs from one system to another. As a consequence, it also provides a method of backup and recovery. VirtualBox is a virtual machine hosting app that can be installed on Linux, Mac, or Windows computers. VirtualBox provides these hosting computers a way to run virtual computers that mimic traditional computers. The VMs consist of similar components that make up…

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SoX Background Audio Monitoring – Triggered Recordings

SoX Background Audio Monitoring – Triggered Recordings

SoX offers quite a few ways to record audio. In this post, I’ll be covering how to record audio for the purposes of security. Home invasions are a sad fact of modern life for any number of reasons. I’ll show how to use SoX to capture audio so it can be added to the tools available to secure your personal belongings. One of the most simplest ways to get a recording from a microphone is to use the following commands….

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RF Spectrum Sweep

RF Spectrum Sweep

Identifying RF Channels to monitor can be a time consuming effort. Using a standard non PC radio receiver can take a long time to identify a transmitting channel. Using RTL_Power and SDR FFT Spectrum Logging provided here (http://kmkeen.com/rtl-power/), makes the effort less challenging. RTL_Power will sweep through a range of radio frequencies at given steps and log the RF power levels detected by the USB SDR receiver. It does this over and over at set intervals to create a log…

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RTL-SDR Radio Scanner

RTL-SDR Radio Scanner

In this post I’ll be giving some background and install steps on RTL-SDR. SDR stands for software defined radio and has been in use since the 1970s. Traditional radio processing is handled by hardware components like oscillators, regulators, and mixers. SDR replaces these functions with digital computer processing. RTL-SDR is a device that was originally designed to receive digital television transmissions, namely DVB-T TV using the RTL2832U chipset. The device is typically contained in a USB dongle. The RTL2832U chipset…

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Decoding DTMF with MultiMon-NG

Decoding DTMF with MultiMon-NG

Dual Tone Multi Frequency signaling, commonly referred to as DTMF, is mainly used for phone dialing systems. But this isn’t the only use for DTMF signaling. Another common use is security access systems. In this post, I’ll be covering how to decode DTMF using MultiMon-NG. SoX will be used to record the DTMF signals generated on cell phones and keyless entry systems. I’ll be using a high gain directional microphone with a secondary microphone to cancel out background noise. SoX…

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Sonic data analysis with SoX

Sonic data analysis with SoX

In this post I’ll be using SoX to export audio to data values that can be processed outside the audio realm. The example I’ll use here is a breif recording that will be plotted with GNUPlot. SoX and other programs provide spectrograms, which are frequency domain images of audio files. I’ll be using GNUPlot to create an image of an audio file in the time domain. First, I’ll use this command to convert the audio wav file into a text…

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Noise Cancelled Microphone with SoX

Noise Cancelled Microphone with SoX

In this post I’ll be using two USB microphones to record audio, one for the intended sounds I wanted to record, the other to capture background noise that I want to filter out. I’m using two cheap USB embedded microphones that I bought for less than $10 each, http://a.co/eIsnp3Z. The machine I’m recording on is a Raspberry Pi 3 running Ubnutu Mate. Since the Raspberry Pi doesn’t have an audio in device built in, I selected the USB microphones. These…

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Ultrasonic SoX

Ultrasonic SoX

This post will be quick and to the point. We’ll be using SoX to bring high frequency audio, commonly referred to as ultrasound, down to a range that can be heard. First thing I did to validate the process was generate an ultrasonic data file using Audacity. The problem with the standard 44.1k sampling rate is ultrasound frequencies will be dropped. I created my data files with a sampling rate of 192k. play “/home/local/Desktop/Ultrasound/Audacity192k_33khz.wav” Playing audio from this sample is…

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