Uploaded January 2025 | Updated September 2026, 2 weeks ago
OK, maybe I'm being a little too self-congratulatory here, lol. In truth, it was the Hilton hotel itself choosing to be proactive, research the problem, and then spend the money necessary to address it. (I think I can be proud, however, of the fact that I have helped several hotels and other buildings spend a very *small* amount of money in pursuit of this goal!)
If you were fortunate enough to attend the final ShmooCon in Washington, DC this past weekend (or if you saw some social media posts from others who were there) then you may already be aware of some upgrades that this property (and others around town) made to all of their doors. Yes, now every single door at the hotel is equipped with a small blocker shroud designed to make under-door attacks as preventable as possible while still complying with building regulations regarding ADA codes and fire codes.
I am proud that my team and I have highlighted this concern to the degree that many facilities teams are now aware of it and I am proud that my team and I have offered up a solution that is achievable and simple. Is it perfect? No... no security is absolutely perfect. But we have solid evidence from our customers that these are having the effect intended. And I think that's pretty cool.
As always, this isn't an ad and I'm not going to link to or explicitly mention our site... if you care about installing door handle shrouds at your facilities, you can find us with a search or by reading comments down below. Enjoy! πππ
- -- ----- ----------
Sign up for give-away drawings here...
deviating.net/contests/give-aways
I'm on the Fediverse. That's a great place to find me...
https://defcon.social/@deviantollam
I'm also on Instagram. I mostly use it for liking my friends' photos...
instagram.com/deviantollam
Bluesky is a newer community, and I'm over there, too...
https://bsky.app/profile/deviantollam.bsky.social
I'm also on Discord, but mostly only because my daughter uses it, lol...
discord.com/users/deviantollam
I post dumb questions to Reddit and sometimes answer folks' questions there, too...
reddit.com/u/deviantollam
This is my GitHub. I post my design files there...
github.com/deviantollam
I still have my Twitter account. I don't use it anymore and neither should you...
twitter.com/deviantollam
This is my personal web site. Most things i create wind up online...
deviating.net
This is my company. We're good at stuff...
enterthecore.net
This is where I train. Come and learn badass skills...
redteamalliance.com
- -- ----- ----------
OK, maybe I'm being a little too self-congratulatory here, lol. In truth, it was the Hilton hotel itself choosing to be proactive, research the problem, and then spend the money necessary to address it. (I think I can be proud, however, of the fact that I have helped several hotels and other buildings spend a very *small* amount of money in pursuit of this goal!)
If you were fortunate enough to attend the final ShmooCon in Washington, DC this past weekend (or if you saw some social media posts from others who were there) then you may already be aware of some upgrades that this property (and others around town) made to all of their doors. Yes, now every single door at the hotel is equipped with a small blocker shroud designed to make under-door attacks as preventable as possible while still complying with building regulations regarding ADA codes and fire codes.
I am proud that my team and I have highlighted this concern to the degree that many facilities teams are now aware of it and I am proud that my team and I have offered up a solution that is achievable and simple. Is it perfect? No... no security is absolutely perfect. But we have solid evidence from our customers that these are having the effect intended. And I think that's pretty cool.
As always, this isn't an ad and I'm not going to link to or explicitly mention our site... if you care about installing door handle shrouds at your facilities, you can find us with a search or by reading comments down below. Enjoy! πππ
- -- ----- ----------
Sign up for give-away drawings here...
deviating.net/contests/give-aways
I'm on the Fediverse. That's a great place to find me...
https://defcon.social/@deviantollam
I'm also on Instagram. I mostly use it for liking my friends' photos...
instagram.com/deviantollam
Bluesky is a newer community, and I'm over there, too...
https://bsky.app/profile/deviantollam.bsky.social
I'm also on Discord, but mostly only because my daughter uses it, lol...
discord.com/users/deviantollam
I post dumb questions to Reddit and sometimes answer folks' questions there, too...
reddit.com/u/deviantollam
This is my GitHub. I post my design files there...
github.com/deviantollam
I still have my Twitter account. I don't use it anymore and neither should you...
twitter.com/deviantollam
This is my personal web site. Most things i create wind up online...
deviating.net
This is my company. We're good at stuff...
enterthecore.net
This is where I train. Come and learn badass skills...
redteamalliance.com
- -- ----- ----------

![Recovering a Locked or Bricked T5577 Credential
[= T5577 Test Mode Recovery cheat sheet =]
lf t55 write -b 0 -d 00000000 r0 -t
lf t55 write -b 0 -d 00000000 r1 -t
lf t55 write -b 0 -d 00000000 r2 -t
lf t55 write -b 0 -d 00000000 r3 -t
lf t55 wipe
-
My recent video about the Flipper Zero on Modern Rogues channel...
https://www.youtube.com/watch?v=ClWmbxdCmVY
Dangerous Things forum post about recovering bricked T55 credentials...
https://forum.dangerousthings.com/t/reviving-a-bricked-t5577/17885
Conversation in Icemans Discord about the T5577 and Test Mode, etc...
https://discord.com/channels/738045391416852520/756008559069888525/1284376539240206439
T5577 Recovery Script (I believe by Gary Bell) in the RRG Proxmark repo on GitHub...
https://github.com/RfidResearchGroup/proxmark3/blob/master/client/luascripts/lf_t55xx_reset.lua
This is the specific ring featured in this video...
https://www.amazon.com/dp/B09F2FG95V (not a sponsored or affiliate link)
This is the longer talk about Implantable RFID that I recently gave at BSidesRDU...
https://youtu.be/3EFKJ9KaWGY
Link to the Dangerous Things community forum...
https://forum.dangerousthings.com/t/deviant-bsides-talk-about-implants/23417/8
Link to the Biohackers Digital Discord...
https://discord.gg/implants
Link to Icemans RFID Hacking Discord...
https://discord.gg/ICEMAN
-
This is another video about RFID rings, but mostly its about what to do if you have a T5577 credential that is misbehaving, possibly due to being soft-bricked or being password-locked. There are some commands you can run (if youre completely stuck, Ive listed them in order at the top of this doobly-doo) which may be able to recover your T55 card. If you dont care about why or how your credential got borked and you dont care about the data that may be on there and you just want a clear card (and its a real T5577) you can try those commands.
But of course I suggest you try the Proxmarks T5577 Check command to try the password dictionary attack first. Enjoy! πππ
-
Sign up for give-away drawings here...
https://deviating.net/contests/give-aways/
Im on the Fediverse. Thats a great place to find me...
https://defcon.social/@deviantollam
Im also on Instagram. I mostly use it for liking my friends photos...
https://instagram.com/deviantollam
Bluesky is a newer community, and Im over there, too...
https://bsky.app/profile/deviantollam.bsky.social
Im also on Discord, but mostly only because my daughter uses it, lol...
https://discord.com/users/deviantollam
I post dumb questions to Reddit and sometimes answer folks questions there, too...
https://www.reddit.com/u/deviantollam
This is my GitHub. I post my design files there...
https://github.com/deviantollam
I still have my Twitter account. I dont use it anymore and neither should you...
https://twitter.com/deviantollam
This is my personal web site. Most things i create wind up online...
https://deviating.net
This is my company. Were good at stuff...
https://enterthecore.net
This is where I train. Come and learn badass skills...
https://redteamalliance.com
- Recovering a Locked or Bricked T5577 Credential](https://i.ytimg.com/vi/QLhTazEKfXE/mqdefault.jpg)








