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joshkerr.com

Photography nerd 📷❤ — sometime developer. 💻❤

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Getting Started with AI-Powered Pentesting Tools in 2026

After eight months of using AI in real penetration testing engagements, I'm finding 30-40% more vulnerabilities in the same time window. Here's exactly how I'm integrating AI into reconnaissance, exploitation, and reporting—complete with prompts, techniques, and hard lessons learned.

The Quest for the Perfect Update Tool: Why Topgrade Changed Everything

My update routine used to be a ritual: App Store, then Homebrew, then pip, then rustup, then... did I forget something? Probably. Then I discovered Topgrade—one command that detects every package manager on your system and updates them all.

Hack The Box Write Up for Cache

This is a fun medium skill level server at Hack The Box . It is a linux Ubuntu box and it had a few fun elements. I learned a lot about memcached for this one. It also requires some sqlmap work so if you aren’t familiar with that tool,

Hack The Box write up for Tabby

Detailed walkthrough of Tabby HackTheBox machine. Learn about LFI exploitation, Tomcat RCE, and LXD privilege escalation techniques used to compromise the system.

Hack The Box write up for Remote

This is my guide to hacking the server Remote on HackTheBox.eu. I was able to get user and root flags.

Hack the Box write up for Devel

This is the guide and walkthrough for the Devel machine on HacktheBox.eu

Hack The Box write up for Traceback

This guide will help you complete the traceback challenge at hackthebox.eu.

Stunning sunset in downtown Austin, TX

I took this photo from my balcony. I used my iPhone XS (which takes pretty great photos.)

How to move your blog from Medium to Wordpress

Medium recently shut down their third-party API without any notice. I was immediately incensed and decided to migrate my blog away from Medium . You can read more angst on this post and followup discussion on HackerNews about why I left. This article will show you how to migrate your

Proof that the Universe will repeat itself

Discover the Poincaré recurrence theorem—a mind-bending mathematical proof that suggests everything in the universe, including you, will happen again given enough time.

How canaries protect us from the snooping US Government

Learn how warrant canaries exploit a legal loophole to alert users when companies receive secret government surveillance orders—and what happens when they go silent.

Medium needs to support Latex for math and science

Medium is a great story telling platform but it falls short for publishing any serious science and math related articles. The big issue with this type of content on Medium is that it relies on math which can’t be easily rendered on Medium. Most writing platforms struggle with

The Infinite Monkey Theorem

The infinite monkey theorem is a bar in Austin, TX, but it is also a very cool mathematical theorem that deals with very big numbers. This article is about the theorem which has become very popular in recent times. The theorem as I understand it is as follows: A monkey

1+2+3+4+... = -1/12

This is a remarkable and hard to believe consequence in mathematics. If you were to sum the natural numbers all the way to infinity, you would get \(-\frac{1}{12}\). $$ 1+2+3+4+5+6... = -\frac{1}{12} $$ This is just insane. It makes no sense that a series

Graham's number - big numbers blow my mind!

Explore Graham's number—a number so large that memorizing its digits would collapse your brain into a black hole. Learn how it's built using Knuth's up-arrow notation.