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Tim Medin

@timmedin.bsky.social
1.5K followers 778 following 296 posts

Kerberoast Guy • RedSiege CEO • Hater of Pants • Former SANS 560 Author, Senior Instructor • Packers owner • Work Req: redsiege.com/contact

PostsRepliesMedia
Tim Medin @timmedin.bsky.social · 06/01/2026
I decided to chat with a spammer/scammer. I found them to be pretty honest and forthcoming.
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Tim Medin @timmedin.bsky.social · 06/01/2026
Apple's Liquid Glass was cool for like 1 minute.
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Tim Medin @timmedin.bsky.social · 11/12/2025
My "Death by Dashboards" talk from WWHF is up!
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Tim Medin @timmedin.bsky.social · 11/12/2025
Months of battling, and I won. Inbox zero. ... for now.
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Tim Medin @timmedin.bsky.social · 10/12/2025
Microsoft created Get-KerbEncryptionUsage.ps1 (see link in article) to query the event log to see which encryption types Kerberos used within your environment. Run this, find the ones that MUST use RC4, and burn the rest. Then figure out how to upgrade the others from RC4 or pick a great password.
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Reposted by Tim Medin
WinterKnight @winterknight.net · 29/11/2025
The ones here are obnoxious. But there’s a charm about Wisconsin alcoholics that Minnesota alcoholics just don’t have.
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Tim Medin @timmedin.bsky.social · 10/12/2025
I can't spell that stupid word correctly... ever
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Tim Medin @timmedin.bsky.social · 10/12/2025
"By mid-2026, ... Windows Server 2008 and later to only allow AES-SHA1 encryption. RC4 will be disabled by default and only used if a domain administrator explicitly configures an account or the KDC to use it." www.microsoft.com/en-us/window...
microsoft.com
Beyond RC4 for Windows authentication
As organizations face an evolving threat landscape, strengthening Windows authentication is more critical than ever.
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Tim Medin @timmedin.bsky.social · 29/11/2025
I love WI airports. Concourse beers are not only legal, but it’s encouraged with signs all over the airport.
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Tim Medin @timmedin.bsky.social · 18/11/2025
“Killer” lol So bad. ;)
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Tim Medin @timmedin.bsky.social · 14/11/2025
I'm home after teaching Offense for Defense at NineStart Connect. They offered free (yes, free) training to whomever wanted to attend. I can't thank them enough for offering this to our community! The class is available here: training.redsiege.com (affordable, not free... sorry you missed out 😉)
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Tim Medin @timmedin.bsky.social · 06/11/2025
Wrapping up @defcon.bsky.social Bahrain at the ICS Village. Not my best picture, but excellent photo bomb.
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Tim Medin @timmedin.bsky.social · 25/10/2025
Damn. I’m never going to find this room.
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Tim Medin @timmedin.bsky.social · 10/10/2025
Two days of teaching Pen Testing: Beyond the Basics ✅ Two hour Kerberos workshop ✅ Talk ✅ Tomorrow, time to be a full time booth babe.
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Tim Medin @timmedin.bsky.social · 09/10/2025
Last year at @wildwesthackinfest.bsky.social a few packages arrived late (not mine). The maintenance staff regularly receives packages and thought it was theirs. They opened it, found a pack of stickers. They have been putting them on their stuff and the hotel. "We wondered who that guy was"
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Reposted by Tim Medin
Red Siege @redsiege.com · 09/10/2025
Senior Security Consultant Justin Palk tells you everything you need to know about getting started with proxy chains in this blog 🔗 redsiege.com/proxychains #hacking #infosec #cybersecurity
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Tim Medin @timmedin.bsky.social · 09/10/2025
The booth is hopping! Stop by to get tons of stickers, a shirt, and get entered to win a framed autographed picture from Hackers.
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Tim Medin @timmedin.bsky.social · 01/10/2025
Join us tomorrow!
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Tim Medin @timmedin.bsky.social · 01/10/2025
Live now with pre-show banter with @mzbat.bsky.social (Kimber) and @antisyphontraining.bsky.social. Close Security Gaps, Pass Audits, Stay Secure w/ Kimber Amos and @redsiege.com www.antisyphontraining.com/event/anti-c...
antisyphontraining.com
Anti-Cast: Close Security Gaps, Pass Audits, Stay Secure with Kimber Amos - Antisyphon Training
Join Kimber Amos for a free one-hour training on cutting through compliance theater and running reviews that actually strengthen defenses and keep auditors happy.
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Tim Medin @timmedin.bsky.social · 30/09/2025
I think about this often. What is a real world bad guy's level of effort for cracking? How long do they spend? How big is their cracker? Do they have multiple crackers? How do they distribute the load?
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Tim Medin @timmedin.bsky.social · 30/09/2025
BRB, going to wake up Billie Joe. www.youtube.com/watch?v=pGhw...
youtube.com
Green Day - Wake Me Up When September Ends (Official Audio)
YouTube video by Green Day
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Tim Medin @timmedin.bsky.social · 26/09/2025
Join me next week on the Thursday Defensive (thursdef.com) next Thursday at 1:30 ET on Offensive for Defense - How defenders can use offensive tools to test themselves.
thursdef.com
Thursday Defensive Webcast - Recon InfoSec
Unscripted, commercial-free discussions between seasoned cybersecurity professionals, streamed live.
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Tim Medin @timmedin.bsky.social · 24/09/2025
Couldn't agree more. How many high/crit PHP findings in your vuln scan reports that are meaningless because that function isn't used (or used with user input). Teams work hard remediate issues that have 0 impact, largely because it shows up in a dashboard, metrics, or KPIs... not because it matters.
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Tim Medin @timmedin.bsky.social · 18/09/2025
Really cool to be interviewed and quoted in this article.
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Tim Medin @timmedin.bsky.social · 16/09/2025
RC4 used with Kerberos isn't the fundemental flaw we think. Yes, RC4 is deprecated, but the real issue is the key generation for AES v RC4 for cracking (Kerberoasting). With RC4 the key = password hash. With AES it is 4096 rounds of hashing of hash+username+domain. The 4096 rounds matters, a lot!
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Tim Medin @timmedin.bsky.social · 12/09/2025
I'm looking forward to @wildwesthackinfest.bsky.social. I also have a Kerberos workshop there, so check that out. Oh, and we'll have tons of swag at the @redsiege.com booth, so stop by if you're in-person!
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Tim Medin @timmedin.bsky.social · 11/09/2025
In response to Senator Ron Wyden's letter to the FTC, I have put together my comments on Kerberoasting and RC4. redsiege.com/blog/2025/09...
redsiege.com
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Tim Medin @timmedin.bsky.social · 10/09/2025
A senator talking about Kerberoasting was not on my bingo card!
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Tim Medin @timmedin.bsky.social · 10/09/2025
The issue isn't as much RC4 as it is bad passwords. While RC4 isn't good, other encryption does *not* prevent Kerberoasting. AES128 and AES256 just slow down the attack by ~100-170x. If the password is really bad, 170x is meaningless. @matthewdgreen.bsky.social arstechnica.com/security/202...
arstechnica.com
Senator blasts Microsoft for making default Windows vulnerable to “Kerberoasting”
Wyden says default use of RC4 cipher led to last year’s breach of health giant Ascension.
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Tim Medin @timmedin.bsky.social · 16/08/2025
“Always go for more sparkles!” Words of wisdom from a 9 yo at Heathrow when I asked if I should get the more and less sparkling water. Such a valuable life lesson there. She also said, “trust the diva”. Another valuable lesson.
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Tim Medin @timmedin.bsky.social · 15/08/2025
I love KC. BBQ capital of world! Had some fantastic Gates BBQ!
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Tim Medin @timmedin.bsky.social · 14/08/2025
After some fantastic KC BBQ at Gates last night, Molly and I are at INTERFACE KC 2025. Great group and I'm thankful for the opportunity to present! If you're here, come stop by the @redsiege.com booth!
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Tim Medin @timmedin.bsky.social · 03/08/2025
Day 1 of Red Team Tactics in the bag! And we got the best named room at @blackhatevents.bsky.social!
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Tim Medin @timmedin.bsky.social · 29/07/2025
I watched Happy Gilmore 2 with my boys last night. It was fantastic and so much fun. Loved all the fan service and cameos. It was actually funny too. Loved it!
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Tim Medin @timmedin.bsky.social · 24/07/2025
lol
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Tim Medin @timmedin.bsky.social · 24/07/2025
Got to the gate three minutes before boarding. What do I do with all this extra time?
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Tim Medin @timmedin.bsky.social · 22/07/2025
Back in studio recording another class!
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Tim Medin @timmedin.bsky.social · 15/07/2025
.@blackhatevents.bsky.social just expanded the number of seats in our class, so there is (new) room available! Come join us!
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Tim Medin @timmedin.bsky.social · 14/07/2025
The most listened to song of all time is not from the Beatles. It's this banger. That said, no one wanted to listen to it. www.youtube.com/watch?v=IAjY...
youtube.com
Tim Carleton & Darrick Deel — Opus No. 1 (Opus Number One) 1080p (Cisco Default Hold Music)
YouTube video by jack7cat
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Tim Medin @timmedin.bsky.social · 08/07/2025
Wow, it's been a year since we went our own way on training. I couldn't be happier where things have ended up. We now have 4 classes! One is running at Black Hat. Two are running at WWHF. One more will be ready for on-demand very soon. The price point for the direct classes is more affordable too!
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Tim Medin @timmedin.bsky.social · 02/07/2025
I’ve been reading Fox in Sox to my kids for 16 years and I *finally* had a perfect reading with no mistakes or stumbles! Sorry, but the world now ends tomorrow.
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Tim Medin @timmedin.bsky.social · 01/07/2025
Super excited to have this available for you all. The videos are 🔥!
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Tim Medin @timmedin.bsky.social · 25/06/2025
How many dozen oysters is too many dozen oysters? I’m at three. It’s $1/oyster today. The record here is 144 (12 dozen).
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Tim Medin @timmedin.bsky.social · 21/06/2025
Two boys, two balls. I love how baseball players and fans make it about the kids.
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Tim Medin @timmedin.bsky.social · 21/06/2025
Yankees Stadium with the boys (two of them)
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Tim Medin @timmedin.bsky.social · 21/06/2025
I love NYC, but is there a grosser combo of subway and taxis anywhere in the developed world? Paris is almost as bad.
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Tim Medin @timmedin.bsky.social · 20/06/2025
Had a great time at #SecretCon today.
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Reposted by Tim Medin
Lee Zimmerman @zim2918.bsky.social · 16/06/2025
A single line poem
This work © 2025 by Lee Zimmerman is licensed under Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International
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Tim Medin @timmedin.bsky.social · 13/06/2025
Finally fought my way to Inbox Zero to find that Microsoft updated the empty inbox image. What the heck is it? Soap holder? AirPod case?
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Tim Medin @timmedin.bsky.social · 29/05/2025
lol, spammer oopsie
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