USB Neutralizer

USB Neutralizer

We’ve all been there. A colleague, friend, or relative hands you a USB flash drive followed by the famous words: "Don’t worry, I formatted it. It’s clean."

If you work in IT or cybersecurity, your internal alarms probably start ringing. For years, my personal policy was simply never to plug untrusted USB drives into my main systems. But sometimes, you just can’t avoid it. Many times, I found myself thinking: what is the most reliable, cheap, and fast way to sanitize a USB device before it ever touches my OS?

That train of thought led to the USB Neutralizer a tiny hardware device built on the incredibly cheap Raspberry Pi Pico and fast enough no matter of the size of the USB drive. In a matter of seconds you have a device which you can safely plug to your System.

⚠️ WARNING: DATA DESTRUCTION ⚠️ Plugging a USB drive into this device will instantly and permanently destroy its partition tables. All files and data will be lost. Do not connect a drive unless you intend to erase it.

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mountpi 0.2 released

mountpi 0.2

Following the contributions from @pevsonic and @RobertLauferElektrobit I decided that is time to update mountpi to version 0.2. In the first version I described the overall functionality and all the manual steps to mount the ext4 partition of Raspberry PI OS to Linux. The new version contains extra functionality to simplify even more working with Raspberry PI images.

Changelog

  • Added – List image partitions usign the list flag (-l)
  • Added – Mount the boot partition using the boot flag (-b)
  • Added – Mount any ext4 partition by specifying it’s index (-p)
  • Added – Mount all image’s partitions using all flag (-a)
  • Added – More information during script execution using verbose flag (-v)
  • Fixed – Unmounting no longer requires the image name, only the mount directory.
  • Fixed – Flags and parameters handling optimization

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ESP32 Bus-Pirate for ESP32-S3DevKit

Bus-Pirate

About a year ago, I ran into a problem where I wished I could connect to a Serial port over the internet. It made me wonder: why hasn’t anyone turned an ESP32 into a Serial and I2C gateway over WiFi? Soon after I found the JetKVM and as you can see from my relative post I solved my issue with the Serial port. Two weeks ago, on a reddit post I discovered ESP32 Bus-Pirate which I believe has the potential to grow to something amazing.

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Kali GPG Error the repository is not signed

Kali GPG Error

On April 28th Kali announced the rolling of a new signing key for the Kali repository. As a result, any existing installation will fail with the error GPG Error, the repository is not signed, when trying to update the repositories using the sudo apt update command:

Err:1 http://kali.download/kali kali-rolling InRelease
The following signatures couldn't be verified because the public key is not
available: NO_PUBKEY ED65462EC8D5E4C5
Warning: GPG error: http://kali.download/kali kali-rolling InRelease: The fol
lowing signatures couldn't be verified because the public key is not availabl
e: NO_PUBKEY ED65462EC8D5E4C5
Error: The repository 'http://http.kali.org/kali kali-rolling InRelease' is n
ot signed.
Notice: Updating from such a repository can't be done securely, and is theref
ore disabled by default.
Notice: See apt-secure(8) manpage for repository creation and user configurat
ion details.
Notice: Repository 'Kali Linux' changed its 'firmware component' value from
non-free' to 'non-free-firmware'
Notice: More information about this can be found online at: https://ww.kali.
org/blog/non-free-firmware-transition/

As stated on the official blog, to fix this issue, the new key should be manually installed using the following command:

sudo wget https://archive.kali.org/archive-keyring.gpg -O /usr/share/keyrings/kali-archive-keyring.gpg

This is the only required action. After that, sudo apt update will function as it did before.

Kali updating repositories

Stream Audio over IP using MediaMTX

Audio Over IP

Audio over IP (AoIP) is the distribution of digital audio across an IP network, local or even the Internet. Many proprietary systems came into existence for transporting high-quality audio over IP based on Transmission Control Protocol (TCP), User Datagram Protocol (UDP) or Real-time Transport Protocol (RTP). Even European Broadcasting Union (EBU) published an interoperable standard for audio over IP using RTP the N/ACIP or Tech3326. In this post we will use MediaMTX Server in combination with FFMPEG to stream an audio input channel over network.

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Keypirinha Search CSV package

Keypirinha CSV Package

Keypirinha is an open-source fast launcher which boosts your efficiency with hotkeys, keywords, text expansion and more. It allows users to quickly find and launch applications, files, bookmarks, URLs, and even perform tasks like evaluating mathematical expressions, hashing strings, and generating random UUIDs.

It features a plugin-oriented architecture, meaning its functionality is largely driven by plugins, which help populate its internal database (the Catalog) with searchable items. Users can configure Keypirinha manually via INI files, as it does not have a graphical interface for configuration.

Unfortunately, Keypirinha appears to have been discontinued, with no new updates since November 8, 2020 (v2.26) although it remains fully functional.

Last week I was wondering how I can easily search and copy values from different csv files. After some hours of searching I wasn’t able to detect any existing solution. So I set to deploy my own Search CSV package for Keypirinha.

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JetKVM – Control your serial devices over the network

Control your serial devices over the network

JetKVM is an open-source KVM over IP (Keyboard, Video, Mouse) solution designed for efficient remote management of computers, servers, and workstations. Originally launched as a Kickstarter project, I supported it and received my own device in early 2025. Like many renowned reviewers, I was impressed by the build quality of both the hardware and the software. However, this post is not just another review of the device. Instead, it will describe how you can further extend its functionality to manage even more devices—specifically, how to control your serial devices over a network.

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[Product Review] LC Gigabit Ethernet Port Switcher

Ethernet Port Switch

I recently purchased the LC Gigabit Ethernet Port Switcher from Aliexpress. It appears to be manufactured by Shenzhen LC Technology Co., Ltd, although the product’s web page seems incomplete. Given the electronic nature of the device (specifically for its switching functionality), the ability to switch to a different Ethernet connection using a GPIO is intriguing. This approach can maintain network or device isolation at the hardware level, enabling connectivity only under specific circumstances.

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Reset Raspberry PI using Raspberry PICO or Arduino

While working on my last project, I wanted a way to manually trigger a hardware reset on a Raspberry Pi using a microcontroller such as a Raspberry Pi Pico or Arduino. All recent versions of Raspberry Pi boards have a RUN pin (separate from the GPIO header) that can be used to either reset the device or wake it up from a halt state. The official documentation mentions "Connect to GND to reset" for this specific pin. Using this information, I came up with a very simple schematic that can be used with both 5V and 3.3V logic microcontrollers, utilizing a common NPN bipolar junction transistor (2N3904).

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Network Tap v2 MiTM Edition

Network Tap v2 - MiTM Edition

In my previous post I described how to utilize a Raspberry Pi and capture the traffic from a network device’s SPAN port. In this post, you will find out how to create a proper Network Tap which directly intercepts a network device’s traffic. This is actually a hardware variance of the Man in the Middle Attack (MiTM) which eliminates the requirement for network speed degradation of the Passive Taps.

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