29
Jul
WTF is happening on tcp:0? 2020 edition
tl;dr: 0.06% of the publicly-addressable IPv4 space is listening to and responding on TCP Port 0. Why? idk…
3 min read
caseyjohnellis
hacker/hustler. chairman/founder/cto @bugcrowd and cofounder @disclose_io. husband, dad, musician, believer. pioneer of crowdsourced security as-a-service.
17
Jul
A few good cybersecurity companies
I spend a lot of time looking at cybersecurity solutions and companies, partly on request, and partly because it always fascinates me to see people are attempting to solve big problems.
4 min read
08
Jun
On not being not-racist
An active problem needs an active opposing response, a passive response will always allow the aggressor to succeed in the end.
2 min read
26
May
First principles
Simple is strong.
Respect is key.
Build it like you own it.
Don’t be valuable, create value.
Think like a hacker.
360-degree accountability.
1 min read
16
May
Priority One: Insights into Submission and Payment Trends
2020: Chaos is a Ladder
As 2020 comes to a close, I’ve started to see summaries of the year
3 min read
08
Apr
To err is human - Kerckhoffs' Principle in Software Transparency
Shannon and Kerckhoff were pioneers of disclosure thinking — They understood the concept of “build it like it’s broken”. This was especially true in WWII cryptography, but it’s becoming increasingly clear in its relevance to the 'peacetime' software that we use today.
2 min read
29
Mar
Hacking styles
Broadly, there are two things that come into play when it comes to the style a person applies to hacking: The level of experience, and the overall wiring of the hacker.
1 min read
28
Mar
A message to folks providing "free testing" at the moment
TLDR: If you’re performing any active, unsanctioned testing on healthcare systems: Please stop it. Don’t make their job any harder than it is right now.
1 min read
28
Mar
COVID-19/Coronavirus - What are the bad guys up to?
As expected, the covid19 pandemic has out brought some of the Internet’s worst. I’ve been working with several groups to information share and fight back on this stuff, including the COVID-19 CTI Group.
2 min read
23
Mar
Changes
You know that awkward thing at the moment when you see someone and go to shake their hand or hug
1 min read