Dan Kaminsky once found a flaw in DNS that would have basically destroyed the internet and helped fix it in secret. Doesn’t get any more legendary than that. RIP. https://t.co/suzTRqhdEA

— rob rhyne (@robrhyne) April 24, 2021

it's mind blowing scrolling through my feed and seeing nothing but fond memories of @dakami

that's all there is

he impacted so many of us on so many levels, and it's amazing ? https://t.co/1EgMPCtnL5

— Whitney Champion ?? (@shortxstack) April 24, 2021

It’s impossible to reference the old “scene” without mentioning ⁦@dakami⁩. His work and personality were highly influential to the foundation this community was built on. He was never too famous for anyone, and his absence will forever be felt. https://t.co/cHzfXARuEt

— ʝօɦռռʏ Ӽʍǟֆ (@J0hnnyXm4s) April 24, 2021

A very long time ago, @dakami didn't think I was a joke, and helped convince me of that as well. If you asked me to name someone enormously kind in InfoSec, his name likely would have come first.

He even insisted on sending me a care package, with a note I have now lost. ?

— SwiftOnSecurity (@SwiftOnSecurity) April 24, 2021

Aw Dan. The year we met, you showed me a camera that fit in an Altoid box the night HD told me he was building metasploit.
Your DNS bug catalyzed the creation of Microsoft Vulnerability Research. But your kindness is what we’ll miss. Rest easy old friend?https://t.co/cbeta7uRGe

— Katie Moussouris (she/her) is 1/2 vaccinated (@k8em0) April 24, 2021

This thread of mourning for @dakami demonstrates just how many lives one touches, often without realizing it.

Now observing 53 seconds of silence in honor of your favorite port. Our community already misses you, Dan. https://t.co/q1SnpY3SB3

— Rob Flickenger ⚡ (@hackerfriendly) April 24, 2021

I am shocked and stunned. The brilliant Dan Kaminski has passed away at the age of 42. I hung out with him at multiple hacker cons, he was always kind, energetic, and so so smart. Here is a pic of us at the Def Con speaker lounge, Alexis Park in Las Vegas. @dakami #defcon RIP https://t.co/nGR1zk0n2j pic.twitter.com/uQ02w7xNBt

— Elonka Dunin (@ElonkaDunin) April 24, 2021

.@dakami was smart. He was kind. Even when I barely knew what a buffer overflow was, he made me feel like a valued member of the security press. He answered my many calls & emails, in part because he loved to talk about security but also because he was so generous with his time.

— Dan Goodin (@dangoodin001) April 24, 2021

It’s a footnote in his remarkable career, but I’ll always remember @dakami for making DanKam, an amazing AR vision app for the colorblind. Grateful I got to meet him a few years ago and thank him in person. https://t.co/O68a3MkDvu

— Andy Baio (@waxpancake) April 24, 2021

So much good advice here and a document of Dan’s kindness https://t.co/bdwHfEYMdr

— Anthony DeRosa ? (@Anthony) April 24, 2021

I’m speechless. I don’t know what to say. I didn’t know Dan well, but in the conversations I had with him, he was impressive to say the least. My sincerest condolences to his friends & family. This is a huge loss to not only those that knew him, but the entire community. https://t.co/Ki6LBjPfoU

— Adam Caudill (@adamcaudill) April 24, 2021

Dan Kaminsky was a pioneer in the information security community, one of the original big names of modern internet security. Holy shit, what an incredible loss to the tech community and the world. https://t.co/1QbWzIhuBd

— Mike (@miketheitguy) April 24, 2021

Today the industry lost yet another great person. Having only met @dakami a few times at Defcon he was always happy to help and offer good advice, the thread below is a highlight of just some of the great advice he was known to give. https://t.co/nDQn1TNwEn

— Andy (@ZephrFish) April 24, 2021

This is incredibly sad. Dan (doxpara) was clever, brilliant, loving, and kind. He let me crash with him at Defcon when I wasn't old enough to book a room, kicking off 20 years of friendship. He was a brilliant hacker, researcher, and entrepreneur. He will be missed terribly. https://t.co/igqdSZIaLK

— David Ulevitch ?? (@davidu) April 24, 2021

Bloody hell, I knew he was sick but this is a very great loss. Every single internet user has benefited from Dan's work, it's a great loss.

Asked him once why he hadn't gone to the dark side and got rich. He said he didn't want his mum to risk having to visit him in prison. https://t.co/PHBlkLrPSE

— Iain Thomson (@iainthomson) April 24, 2021

I still remember his 2008 ToorCon talk when Dan "Rickrolled the internet," as he put it, to show the dangers of ISPs injecting ads into mistyped domains, which at the time was common.https://t.co/H2FJll6JSn

The way Dan moved his hips to Rick Astley had the audience in stitches

— Dan Goodin (@dangoodin001) April 24, 2021

just hearing about dan kaminsky. i don’t have any words worthy of the man. he was a beautiful, kind, important person, and a friend. love you, man. we’ve got it from here. rest now <3

— Mike Solana (@micsolana) April 24, 2021

Dan Kaminsky’s @dakami passion, creativity, desire to learn and teach really help influence both #defcon and @BlackHatEvents in the early years. He became an icon in all the positive ways and we looke up to him. RIP Hacker.

— DEF CON (@defcon) April 24, 2021

I guess theres no hiding it now. We lost @dakami yesterday. One of the brightest lights in infosec and probably the kindest soul I knew. The vacuum he leaves behind is impossible to measure. Please keep speculation to yourself and be respectful of his family and friends.

— Marc Rogers (@marcwrogers) April 24, 2021

Lots of people have goofy @dakami stories. That's something I love about him. RIP Dan Kaminsky. #defcon https://t.co/tkseGRw24E

— miss jackalope (@djjackalope) April 24, 2021

Saddened at the loss of @dakami. He was incredibly smart and incredibly nice. https://t.co/LjusLfzbA5

— Mark Russinovich (@markrussinovich) April 24, 2021

DEF CON 8 (2000). Here is a young @dakami helping to put out a trash fire. This picture is prophetic.

My fave pic of Dan. Please RT. pic.twitter.com/TpGOQZZT92

— Shatter (@Shatter242) April 24, 2021

Dan Kaminsky was one of smartest people I've ever known. He wrote an op-ed for @CyberScoopNews the day it debuted, where he called for a better way to guard the internet. Only the cached version exists, but you should read it, as it is very prescient. RIP https://t.co/RVManzkB1L

— Greg Otto (@gregotto) April 24, 2021

Many people are remarking on all those in their timelines are talking about @dakami.
This is the impact you can have with effervescent intrigue and kindness. It matters on the level of human society.
We need to advertise this and reward it – not regret "what could have been."

— SwiftOnSecurity (@SwiftOnSecurity) April 24, 2021

When Dan was hacked and 4 years of his email and IMs were leaked on the eve of the 2009 Black Hat, Dan was clearly shaken, but he took it in stride. "Messy, but heh," he wrote. "Walk onto a battlefield, you might get shot." That's the kind of guy he was.https://t.co/N72B3n2HVr

— Dan Goodin (@dangoodin001) April 24, 2021

I’m so sad about this. Dan did so many things for me early in my career. His kindness and patience and lighthearted approach kept me going many times. He treated me like a peer when he was a giant. I’m very sad ? https://t.co/FJ7LVNhUW6

— ? Sherrod DeGrippo (@sherrod_im) April 24, 2021

When Len died, @dakami was one of the first people who reached out. He DMed his phone number. That’s just who he was.

When a trans friend of ours couldn’t afford surgery, he paid for it so that dysphoria wouldn’t get in the way of her hacking. That’s just who he was.

— Meredith L. Patterson (@maradydd) April 24, 2021

I remember attending his talk at DEFCON 12 and being blown away by it. Three years later, I went on the original "Hackers on a Plane" trip and ended up seated next to Dan on one of the flights. We quickly became friends. His mentorship over the years had an enormous impact on me. https://t.co/5wfmMAauxI

— Ryan Castellucci (@ryancdotorg) April 24, 2021

Terrible loss. RIP Dan. Thank you for all of your contributions. https://t.co/IsgnVOyqpj

— Ann Johnson (@ajohnsocyber) April 24, 2021

This lengthy thread that Dan wrote a year ago is him imparting the salient parts of everything he learned in life and in infosec. https://t.co/LOBUYOyWFu

— Kim Zetter (@KimZetter) April 24, 2021

Shit! Here's another example of Dan's thoughtfulness. At a dinner during a con where the group had grown to an unmanagable size, he noticed I'd had a hard time getting served. He not only shared his sushi with me, but on the walk back to the hotel got us a pizza to share. https://t.co/7Baq17VV8O

— Sandy Clark (@sa3nder) April 24, 2021

Damn. One of the nicest and most talented hackers I've ever met. I randomly met him at a @dweekly house party in like 2005 or so and kept in touch since. He randomly sent me a NES console a few years ago, out of the blue. a huge loss. https://t.co/Xboqhue30P

— Sean Zadig (@seanzadig) April 24, 2021

Oh, no...

Dan was a monumental intelligence. Beyond infosec, Dan and I had many conversations about neuroscience and the neuroscience of vision and color.

I regret that we did not have the opportunity to introduce him to a couple of his neuroscientist heroes, the Neitz’s. https://t.co/AFI1fZlLI5

— Bryan William Jones (@BWJones) April 24, 2021

Oh no. This is terrible to hear. Dan was both brilliant and incredibly kind. https://t.co/aGYCMMrHfb

— Mike Masnick (@mmasnick) April 24, 2021

This is very sad to hear. I had great respect for @dakami, and I've got videos and lecture material based off his pioneering work in DNS security. https://t.co/rGlXxfBziq

— Mike Pound (@_mikepound) April 24, 2021

It's a mighty thing to truly comprehend how things work, mightier still to transmit that understanding to others.
In memory of master teacher @dakami, a list of videos full of Dan's explanatory magic . Feel free to add your favorite Dan links in the thread. pic.twitter.com/7b0QG0U2Cj

— DEF CON (@defcon) April 24, 2021

This hits hard. Dan was always fun to talk to, and his ideas were fueled by a fundamental goodness and optimism for humanity. Not many security people are like that. I’ll miss him. I wish I knew what else to say. https://t.co/0idvbMwPW0

— David Horn (@Madrox) April 24, 2021

I had the pleasure of meeting @dakami in 2010 at HOPE in NYC, and while he'd already established himself as the literal saviour of the internet, he was such a kind and thoughtful person, and was happy enough to answer the bullshit questions of a 20 year old irish volunteer #RIP https://t.co/OI8yMtWZMq

— Andrew Bolster (@Bolster) April 24, 2021

Very few in infosec have their own Wikipedia page. Dan has one because he was such a legend: https://t.co/2xcwN8uxEi

Rest in peace! https://t.co/COzNP1qgE3

— Catalin Cimpanu (@campuscodi) April 24, 2021

RIP Dan Kaminsky. Most people know Dan for DNS cache poisoning and his Black Hat & DEFCON talks. But he was much more. Caring. Generous. Humbly engaging deep in twitter threads with n00bs (like me). I hope Dan's legacy lives on in the best traits we all choose to adopt from him. https://t.co/qtGrUQqt1R

— Ben Goerz (@bengoerz) April 24, 2021

So sad to learn of Dan’s passing. He was immensely kind, a teacher and friend to all. Still in shock... what a loss for the world... https://t.co/n3uAGpvU5A

— Dylan Field (@zoink) April 24, 2021

The first time I saw Dan present was at DEFCON X, and the way he told stories and related to computers was truly something different. Later I would come to realize he was one of the kindest, most creative souls in our community. RIP Dan. You will be missed. https://t.co/CCCmLKKWKC

— Maarten Van Horenbeeck (@maartenvhb) April 24, 2021

He didn't take credit then, but at our Women In Tech book launch in 2016 in Seattle, Dan generously paid for us to have a champagne afterparty for family + friends.

He said "Women deserve to have their achievements celebrated."

We sent him this hello. We will miss you, @dakami. pic.twitter.com/M6tCqqsmLn

— Tarah (@tarah) April 24, 2021

What a tragedy. Dan Kaminsky was the soft-speaking, big-thinking type who was a pleasure to dream with, like when we helped build this LED float. Oh, and he saved the internet by patching a major DNS flaw. His legend will live on. https://t.co/BYTd1RE5mZ pic.twitter.com/TodD4wqoMq

— Josh Constine - SignalFire (@JoshConstine) April 24, 2021

カミンスキー・アタック（DNS キャッシュポイズニングの手法の一つ）などで有名な、ダン・カミンスキーさんが42才で亡くなられたそうです。

Security Researcher Dan Kaminsky Has Died https://t.co/iHhmdsJH1b

— みむら (@mimura1133) April 24, 2021

It’s impossible to reference the old “scene” without mentioning ⁦@dakami⁩. His work and personality were highly influential to the foundation this community was built on. He was never too famous for anyone, and his absence will forever be felt. https://t.co/cHzfXARuEt

— ʝօɦռռʏ Ӽʍǟֆ (@J0hnnyXm4s) April 24, 2021

RIP Dan Kaminsky, a legend in network security https://t.co/EoQffaPWXT

— /r/netsec (@_r_netsec) April 24, 2021

“The #Cybersecurity world woke up Saturday to news of the sudden passing of Dan Kaminsky (@dakami), a celebrated hacker who is widely credited with pioneering research work on #DNS security. Dan Kaminsky was 42.” ⁦@SecurityWeek⁩ #MayHeRestInPeace https://t.co/1XPfPT83mn

— Christina Ayiotis (@christinayiotis) April 24, 2021

Just learned my friend of many olden years, @dakami, passed away - way too early. Infosec will be a much sadder place for it ? https://t.co/CT2efuru96

— astera (@astera) April 24, 2021