They call me the content machine. I write about information security topics, with an emphasis on cryptography and distributed denial-of-service (DDoS) attacks. I've written for DarkReading, SC Magazine, and Network World. But most people know me from my monthly column at SecurityWeek.
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One of my favorite pieces, and one of the most high-profile as well. Lots of great discussion around this.
This is the most-read article I've ever written. A true-story about a cyberattack that supposedly involved the nude pictures of Jennifer Lawrence and Kate Upton.
This is is one of my favorite articles. There was a crazy rumor going around after the Paris attacks that the terrorists were using Sony PlayStations to communicate with each other. And that the PS4 encryption was hiding their communications from Europol. So I decided to find out what kind encryption the PS4 uses. And how resistant would it be to surveillance.
The idea for this, my favorite article, had been rattling around my head for years. "Why don't you use your knowledge for evil?" I surveyed over three dozen of my friends and colleagues to find out what their prices were, if any. Some illuminating results.
You’ve been having trouble sleeping because of the SSL visibility problem with all the fancy security tools that don’t do decryption. Put down that ambien, because this Lightboard Lesson solves it. In episode, David Holmes diagrams the Right Way (tm) to decrypt and orchestrate outbound SSL traffic, improving SSL visibility, decreasing failures and improving network performance.
This may be the most significant document I've ever written. Customers used to ask me if we a a Best Practices document around DDoS and I got tired of telling them we didn't. So I wrote it. It took my close to 9 months to birth this baby. It documents every single kind of DDoS we've ever seen and how to combat them. My magnum opens for DDoS.
Took me three years to compile the data for this report. It started out as a personal project that I wrote in a hotel room in Cologne Germany over a weekend. But hundreds of hours and millions of computer scans later... this report. It's all about global encryption trends over a three year period, with some analysis about why each trend is going the way it is. Warning: usual doses of Holmes humor contained within.
Ladies and Gentlemen! Gamers and Cryptoheads! Have you ever wondered which major gaming console has the best message encryption? Well, I’m going to reveal the clear winner in my own recent personal test.
I was born to write this article. It was floating around in my head for years and years, and finally came together. I've delivered a talk about the topic of RNG to dozens of audiences around the world, and the best parts of that talk are summarized in this SecurityWeek piece.
This is by far the most popular thing I've ever written. It consistently gets over 1000 views every month. That means since I wrote it, over 50,000 people have read it. Maybe it goes to show you that people want problems solved!
Here is one of the most important papers I ever wrote. The description of a proper DDoS-resistant network architecture. The real meat of the knowledge lies with the recommended practices document, but this whitepaper outlines it pretty well and makes its case.
F5 Network security evangelist David Holmes offers concrete advice about how cloud outsourcing can help companies with a talent shortfall solve three enterprise security problems: application security, penetration testing, and bug bounties.
TechWeekEurope's Michael Moore speaks to David Holmes, Senior Security Evangelist for F5 Networks, at InfoSecurity Europe 2015
I wrote a piece about the UDP-based distributed denial of service (DDoS) attack involving Spamhaus and CyberBunker. It was published in ComputerWorld in 2013.
Here's the complete list of everything authored by yours truly in 2015. Except the NC-17 stuff, which I've been told should remain unpromoted. Actually, this website you're reading right now is basically my greatest hits, but this blog post gather just a single, awesome year of it.
Here's a fun virtual roundtable that Brian McHenry and me did for the DevCentral guys, Jason Rahm and John Wagnon. Over a half hour we discuss the F5 advanced firewall module. We chat about the market, the history and some of the things that differentiate the product.
Worldwide Security Evangelist. Great title, huh! So what does a Security Evangelist do? This article explains it all.
Here's a 7 minute interview that CSO's Anthony Caruana did with me at the CSO Perspectives roadshow; this one was in Sydney. He asks about the new National Mandatory Breach Notification law, the Internet of Things, and where did I get that awesome shirt? Belgium.
Not every day you get on the front page of the local paper! Was in the Philippines immediately after the first SWIFT banking theft: $81M had been stolen (by the Lazarus group, probably) and laundered through local casinos. I happened to be there speaking with the media about bank fraud anyway, so that's how country manager Oscar Visaya and I ended up on the front page of the paper.
When asked for Comment on the Panama papers, I said heck yeah, there are so many questions. So I put them into a SecurityWeek byline, and then answered them. Most of them. Even the one about Simon Cowell.
I still get questions about this SecurityWeek piece, which is good because I'm quite proud of this one. It's a look at three different systems that tried to patch one of the nagging security "holes" in the Internet and why they all failed.
"The giraffe was probably dead." LOL that is the best line I've ever used to start an article. This SecurityWeek piece about Twitter security came out of a trip I did to Africa.
For the first few years, I had to talk myself into paying the $450 annual fee for American Express Platinum card. This little piece is me getting talking myself into it on paper, as it were. The math checks out. And if anyone is keeping score, I still get the platinum card every year, and it pays for itself.
“Is it possible to quantify your own security posture as it relates to denial-of-service? “ That’s the question a customer of ours has been asking themselves, and they came up with plan to measure exactly that. They’re going to DDoS their own production systems. And here's how they're going to do it.
After many discussions with some of the most high profile brands in the world, I've consolidated their feedback into this single playbook. These are the ten steps you need to do when you get attacked with a distributed denial-of-service. It's basically vendor agnostic, with just the F5 logo on it.
The right guy at the right time. Here's my take on the huge DDoS attacks of September and October 2016. Had to rush this one to release as an official company position on the attacks. I like how it came out.
Here is Part 0 (or part 1) of a series on threat modeling the Internet of Things. Here I introduce these two topics: Internet of Things and Threat modeling and suggest that maybe we need to spend more time putting them together. I like the intro and extro for this piece :)
I get lucky sometimes. This was one of those times. I ran into a member of CERT.be, and he told me of an interesting report about a cyberespinage case in Europe. Made for a great SecurityWeek article.
Strict Transport Security is a simple but very powerful security fix. So why does no-one use it? I explore the topic in this piece for SecurityWeek.
My third piece in the trilogy of articles I've written about the open CA "Let's Encrypt" for SecurityWeek. This one is a more measured look at how LE might impact Internet Security.
After I came back from my 50 days in Asia, I wrote up three observations about how infosec is different there. Some good analogies. Kinda proud of this piece.
As you would imagine, being a security and networking professional, I ran a pretty sophisticated home network. One time I plugged our partner Webroot's IP reputation tool in front of my home router to see what kind of malicious traffic it was flagging. Here are the results.
My technical piece about the Heartbleed vulnerability. Also includes my own rant about OpenSSL. And how to scan your own network for it. And other cool stuff related to it.
I wrote, starred in, or was mentioned in 48 pieces last year. A new record. Here's the best of them.
Sabu was such a rock star in his time. His character and his exploits were legendary at the time and his downfall even more so. I really enjoyed writing this one. I actually had more information on this but couldn't publish it to due privacy concerns. But buy me a beer sometime and ask me about it.
I've been a cryptocurrency skeptic for years. Much of that skepticism comes from hundreds of hours of talking with real CISOs and directors of security about how they can better protect real (not virtual) currency. Even with the resources of enormous budgets and huge security teams they can barely keep the hackers from stealing all the monies. When F5 Labs asked me to write up my opinions about Bitcoin, I threw this together. Not a bad little piece.
Here's the keynote I did for F5's security event in Singapore in June. I teach the audience how to threat model the internet of things (iot),
My love letter to my favorite algorithm of all time, RC4.
In this piece, yours truly evaluates the SWEET32 cryptographic attack relative to other SSL cryptographic attacks such as DROWN and BEAST.
A young hacker came up to me after a talk in Belgium and told me this story. Made for a great article for SecurityWeek.
Here's an awesome whitepaper I wrote in the fall of 2016. I embedded eight references to Huey Lewis and the News. Can you find them all?
My response, representing the vendor community, to US-CERT's warning about SSL interception products.
The explosive second half of the profile of famed hacker Sabu.
Hey look, IT News Africa reprinted my ten-step guide to combating DDoS in real time. This is basically a shortened, texty version of the DDoS playbook.
After a conversation with a chip-maker, I did a bunch of research into Quantum Computing, and collected my notes into this pretty cool report.
Maria Korolov interviewed and quoted me extensively for a Data Center Knowledge piece on WannaCry. I had no time to prepare for this interview, and was surprised when it got published. Sometimes I prepare a LOT and nothing comes of it. You never know, I guess. Just keep doing them.
CSO Online picked up the Maria Korolov's interview did with me and republished it. That's pretty awesome!
We commissioned the analyst firm IDC to do an encryption survey. They asked questions that I always wanted to know the answer to. So what does that have to do with goat parkour? Read on and find out.
This is one of the articles that launched my career as a technical evanglist. I worked on this blog article in my spare time (waiting for builds) as a developer. It hit at just the right time and got a few mentions in the right places. And now here I am, doing this for a living.
Here is an early reaction to the Dyn DNS DDoS attack of Friday, Oct 21. I spent about 8 hours working on an article about the Brian Krebs attack from an airplane over the Atlantic. About halfway through, the Dyn attack happened, and I had to rewrite the article! It was a long day, but at least when I got down there was a decent article ready to go :)
Here's a whitepaper I did on the expectation of SSL everywhere and what it means for business today. Topics covered include Forward Secrecy, Privacy, advanced key management and how to protect everything with an "always on" architecture.
A fine article about evaluating the risks and creating sound strategy around moving to Office365. In the article I briefly mention 5 threats you should add to your threat modeling for cloud collaboration. Threat modeling for cloud could, and should, be its own article or even series of articles. Remind me to write that! :)
“Regulation will likely be the fix for IoT security,” F5 Networks evangelist David Holmes notes in a SecurityWeek column, citing Mikko Hypponen, Chief Risk Officer of F-Secure. However, he also explains that Internet security cannot be regulated like other manufacturing processes. Increasing awareness among users could also help resolve this issue, with the IoT Defense scanner being a small step in this direction.
The Intel Active Management Technology (AMT) vulnerability (now referred to by many as “Silent Bob”) is one of those truly brutal, ugly ones that make you queasy to even think about. Like Heartbleed or Venom. Here's how to scan for it on your network. And what ports to block.
Had a fantastic, wide-ranging interview with Malaya Business Insight reporter Raymond Gregory.
I promised some really nice reporters in Singapore that I would get them my top three safety tips for IoT. So I put together this little blog and posted it on LinkedIn. I think we might expand it for an cyber site somewhere.
Had a long, fun, wide-ranging interview with India Economic Times.
Got quoted by a Forbes article. “Nearly all clients rely on DNS to reach their intended services, making DNS the most critical—and public—of all services,” explains David Holmes... and “This single point of total failure…makes DNS a very tempting target for attackers,” Holmes continues. The pic is Jon Postel, who I consider a father of the Internet.