Top all-time · #4725
Georg Lukas
Personal blog · op-co.de/blogprogrammingsecurity
Georg Lukas's personal blog at op-co.de covers programming and security. Since 2012, 16 different Hacker News readers have linked it 49 times, most often “The Sad State of Mobile XMPP in 2014”. It is still writing: the last post was on 2026-07-26, and you can follow it by feed.
Too few sampled comments (10) to say how often HN recommends it.?
Why HN links it
HN readers link Georg Lukas's blog for its analysis of why XMPP struggles on mobile devices and for reverse engineering of Samsung NX camera firmware and its crypto.
Summarised by Claude from a sample of 10 HN comments that link here. Each comment is marked recommending, critical or neutral (citing without judging); how this works.
Georg Lukas' personal home page with different projects: Open Source programs, (embedded) Linux related code and wireless/networking research.
Most-linked posts?
- The Sad State of Mobile XMPP in 20145 people · 5 mentions · first linked 2014-01-30
- Samsung Galaxy NX: a decade's review2 people · 5 mentions · first linked 2024-07-15
- Authoritative Dnsmasq in a MikroTik Container2 people · 2 mentions · first linked 2026-07-26
- Hacking the Samsung NX300 'Smart' Camera2 people · 2 mentions · first linked 2016-03-19
- Hacking the Samsung NX300 "Smart" Camera2 people · 2 mentions · first linked 2014-05-07
- Are emoji allowed in XMPP addresses?2 people · 2 mentions · first linked 2026-07-17
What Hacker News says?
Jabber/XMPP has a number of problems that make it unsuitable for modern chat environments where clients (read: smartphones) have poor connections and frequently want to sleep to conserve power. For example, XMPP wants an always-on TCP connection between the client and the server for the client to appear "online". There's an extension which allows for sleeping, but having async mobile connections in an extension mean…
Comment linking /blog/posts/mobile_xmpp_in_2014/
on “Gchat Was the Future of Messaging, but Google Didn’t Know”Submitted Why Android SSL was downgraded from AES256-SHA to RC4-MD5 in late 2010 as a story · 365 points
HN discussionXMPP is only a kind of alternative for nerdy users: http://op-co.de/blog/posts/mobile_xmpp_in_2014/
Comment linking /blog/posts/mobile_xmpp_in_2014/
on “iOS holding my phone number hostage = the worst bug I’ve ever experienced”Submitted Samsung WB850F Firmware Reverse Engineering as a story · 212 points
HN discussionGiven that HP is also using obscure/outdated Linux images in their own Intelligent Provisioning / Smart Storage Administrator tools that are installed on the built-in flash of (at least) gen8 servers < https://op-co.de/blog/posts/microserver_gen8_fix_boot_order/ >, I'm not at all surprised to see similar approaches in other situations.
Comment linking /blog/posts/microserver_gen8_fix_boot_order/
on “The weird Hewlett Packard FreeDOS option”Submitted Samsung's abandoned NX cameras can be brought online with a $20 LTE stick as a story · 180 points
HN discussionI liked https://op-co.de/blog/posts/samsung_nx_cryptofail/#index3h3 more. Absolute astonishing firmware "crypto" fail
Comment linking /blog/posts/samsung_nx_cryptofail/
on “Samsung WB850F Firmware Reverse Engineering”Submitted Hacking the Samsung NX300 "Smart" Camera as a story · 126 points
HN discussionIndeed. Take a look at this insightful blogpost: http://op-co.de/blog/posts/mobile_xmpp_in_2014/
Comment linking /blog/posts/mobile_xmpp_in_2014/
on “Mandatory encryption on XMPP starts today”Submitted The Sad State of Mobile XMPP in 2014 as a story · 102 points
HN discussionYeah, I've documented a thing or two about the NX series on https://op-co.de/blog/tags/samsung-nx/ Regarding the RTOS, I took my NX300 from the shelf some weeks ago to make a few shots for the live demo at https://programm.froscon.org/froscon2025/talk/fc37ae17-9264-... and OH MY FSCKING GOD IT'S SLOW! I made a burst shot of a model train approaching, and the camera was busy processing it for multiple minutes. The NX…
Comment linking /blog/tags/samsung-nx/
on “SonyShell – An effort to “SSH into my Sony DSLR””Submitted Backward-incompatible GRUB2 change causing BIOS setup bootloop as a story · 97 points
HN discussionThey are proper cameras, with proper camera-sized sensors, and some model had interchangable lenses. One of them, for better or for worse, even came with Android. https://op-co.de/blog/posts/galaxy_nx/
Comment linking /blog/posts/galaxy_nx/
on “Samsung's abandoned NX cameras can be brought online with a $20 LTE stick”Submitted Reverse-engineering Fujitsu M7MU RELC hardware compression as a story · 40 points
HN discussionAnd even one with interchangeable lenses: https://op-co.de/blog/posts/galaxy_nx/
Comment linking /blog/posts/galaxy_nx/
on “Samsung's abandoned NX cameras can be brought online with a $20 LTE stick”Submitted Java/Android SSLSocket Vulnerable to MitM Attacks as a story · 12 points
HN discussionSo I've used the discussion here and the inspiration by @samcat116 to finally publish my review of the Samsung Galaxy NX - half smartphone, half "professional" camera: https://op-co.de/blog/posts/galaxy_nx/
Comment linking /blog/posts/galaxy_nx/
on “Samsung's abandoned NX cameras can be brought online with a $20 LTE stick”Submitted IT Security Lessons from Fairy Tales as a story · 10 points
HN discussionSamsung actually released multiple Android-based cameras: the Galaxy Camera range with built-in zoom lenses ( https://www.zisman.ca/blog/2013-01-05.html ) and the Galaxy NX with interchangeable lenses: https://op-co.de/blog/posts/galaxy_nx/ They all suffered from running Android 4.x with no major upgrades from Samsung.
Comment linking /blog/posts/galaxy_nx/
on “Samsung's abandoned NX cameras can be brought online with a $20 LTE stick”Submitted Samsung WiFi Camera Museum as a story · 8 points
HN discussionOriginal blog post: https://op-co.de/blog/posts/samsung_nx_mastodon/
Comment linking /blog/posts/samsung_nx_mastodon/
on “Samsung's abandoned NX cameras can be brought online with a $20 LTE stick”Submitted Hacking the Samsung NX300, part 2: Get Root as a story · 8 points
HN discussionWhat are your thoughts on http://op-co.de/blog/posts/mobile_xmpp_in_2014/ ?
Comment linking /blog/posts/mobile_xmpp_in_2014/
on “XMPP Myths”Submitted .IM TLD DNSSEC DLV DANE XMPP TLSA RR as a story · 7 points
HN discussionBecause iOS doesn't let you do that (see http://op-co.de/blog/posts/mobile_xmpp_in_2014/#index6h2 )
Comment linking /blog/posts/mobile_xmpp_in_2014/
on “XMPP Myths”Submitted Samsung NX Mini (M7MU) Firmware File Format as a story · 4 points
HN discussionHowever, low quality tends to surface anyway. With mutt, several issues come to my mind, like: * broken transparency (and trailing spaces in copy&pasted emails) when run in screen. * the hoops you have to jump through if you want to script certain aspects (like opening new mails in their own terminals, http://op-co.de/blog/posts/mulit-window_mutt/ )
Comment linking /blog/posts/mulit-window_mutt/
on “Reading Code: In praise of superficial beauty”Submitted Samsung NX camera to Mastodon bridge as a story · 4 points
HN discussionA lot of the "smarter" cameras already are running Linux; here is an example (more of a "look at how bad the security is" post, but you get the idea): http://op-co.de/blog/posts/hacking_the_nx300/ Personally I think this is a fun hack that shows how much processing power the hardware has, but I wouldn't want to run a full OS on my camera...
Comment linking /blog/posts/hacking_the_nx300/
on “Linux on Your Canon DSLR? Why Not?”Submitted Unix Time: 1,5B Seconds and Y2K38 as a story · 4 points
HN discussion
