Harbinger Security
JeremyExploring hacking and exploitation from first principles
| Platform |  | Pricing | Only free issues | Publishes | Monthly |
|---|---|---|---|---|---|
| Issues | 11 | Founded | a year ago | Last Issue | 5 months ago |
| Active | |||||
Read this Newsletter
harbinger01.substack.comLatest Issues
Detour: The Perceptron Convergence Theorem
Introduction
In the last post, we started exploring neural nets, and in particular the architecture and function of Multi Layer Perceptrons (MLPs). I had said that the next post would be about how MLPs “learn” or get “trained”. However,...
Neural Nets
Motivation
To reliably attack a technology well, we need to understand it on a deep level. This blog post is part of an effort to get a gears-level understanding of LLMs for the purposes of attacking them and their surrounding infrastru...
NorthSec 2025 CTF - Memory Corruption Writeup
I just returned from NorthSec’s annual conference where I was honored to speak on the ethics of AI and security. I also participated in the fantastic CTF, and figured I would write up some of the challenges I did to solidify my learning. We...
Coming soon
This is Harbinger Security.
Subscribe now
Start Studying Security with SQLi
Start Studying Security with...
We previously explored how Cross-Site Scripting (XSS) makes for an excellent topic to understand the reach and impact of hacking. In this post, we'll improve on conceptual understanding and try to help n...
Key Facts
Audience Metrics
Subscribers, engagement, traffic and sponsorship for Harbinger Security.
| Subscribers | Engagement | 61 | Monthly Web Visits | ||
|---|---|---|---|---|---|
| Accepts Sponsors | Estimated Cost per Ad | ||||
Explore More
Authors
The writers behind this newsletter.
Frequently Asked Questions
How can I access the email archive for Harbinger Security?
You can find recent issues that have been published by Harbinger Security on Reletter by scrolling up to where it says Latest Issues. Tap on the link for any of the most recent emails or hit More Issues to see older ones.
How many subscribers does Harbinger Security have?
To see how many people subscribe to Harbinger Security, simply upgrade your Reletter account. We provide readership numbers and lots of other stats for this newsletter so you can decide if it's worth reaching out to.
How can I advertise in Harbinger Security?
Newsletter advertising can be extremely effective when it's done right. Before you pitch Harbinger Security as a potential sponsor or partner, make sure that you've done your research and checked its newsletter stats with Reletter.
Then, personalize one of our winning pitching templates and send it to the right person using the contact info provided.
How much does it cost to sponsor a publication like Harbinger Security?
Newsletter ad rates (or CPM) vary depending on many factors, including industry, number of subscribers, open rate, ad placement and more.
To find out how much an ad will cost, contact Harbinger Security using the contact information provided and ask for a copy of their media kit.
How can I find newsletters related to Harbinger Security?
Scroll up to where it says Related Newsletters to see other publications like Harbinger Security. You can also search our email newsletter directory to discover other newsletters that cover the topics you're interested in.
How do I contact Harbinger Security?
Reletter provides this newsletter's website URL above, where you will often find their contact information. We also provide links to associated social media accounts and pitching templates so you can reach out fast.