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Useful Old Technologies: ASN.1 (2013)
Useful old technologies: ASN.1
Top posts
Every blog post that took off on Hacker News, ranked by the votes of its best submission. 3,021 posts.
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Flightradar24 ADS-B Receivers On-board a Surface Ocean Robot
We are excited to announce for the first time that we have received and processed ADS-B signals collected by our autonomous boat. The unmanned surface vehicle, a Wave Glider® manufactured by Liquid Robotics® and managed by Maritime Robotics as part of their new partnership, is receiving ADS-B signals from aircraft…
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DEFCON Router Hacking Contest Reveals Major Vulnerabilities
"I could take down the internet with that, and so could you." Dan Geer, Chief Information Security Officer of CIA’s venture capital arm, didn't mince words when he mentioned the security flaws in home routers during his keynote address at last month's Black Hat conference in Las Vegas. But he also...
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Using SNI proxying and IPv6 to share port 443 between webapps
I hate HTTP reverse proxies and want my webapps to listen directly on port 443. How can I make this work in a world of IPv4 scarcity?
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What DMARC Protects You From, and What It Does Not
DMARC verifies a domain owner authorised an email; it does not verify the email is safe. Where DMARC helps, where it falls short, and why authentication is not trust.
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Yes, the Book of PF, fourth edition is coming soon
© 2025 Peter N. M. Hansteen Long rumored and eagerly anticipated by some, the fourth edition of The Book of PF is now available for ...
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Fixing the Ethernet Board from a Vintage Xerox Alto
A Xerox Alto system on the East coast had Ethernet problems, so the owner sent me the Ethernet board to diagnose. (After restoring our Alto,...
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How and why Daily is using Rust for our WebRTC APIs
Exploring why Rust is our preferred language for a core WebRTC library
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eBPF Networking Techniques – Packet Redirection
This is the first post of a many planned to shed light on the various networking techniques eBPF makes available to a Linux network developer.
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Email Done My Way, Part 0 – The Journey
Warning. This whole series is not a simple HOWTO. This series is about how I run my mail server. I go through the configuration, line by line and explain. It’s not going to be a simple Copy/Paste to run your own mail server. You have been warned.
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Some thoughts on security after ten years of Qmail 1.0
Some thoughts on security after ten years of qmail 1.0 Bernstein, 2007 I find security much more important than speed. We need invulnerable software systems, and we need them today, even if they ar…
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TeraWave Satellite Communications Network
Blue Origin today announced TeraWave, a satellite communications network designed to deliver symmetrical data speeds of up to 6 Tbps anywhere on Earth.
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A month using XMPP (using Snikket) for every call and chat (2023)
For the last month, I’ve been using XMPP (using Snikket) for every call and chat between me and my wife Sandra, at least.
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Mastodon Is Rewinding the Clock on Social Media – In a Good Way
A comment on a Hacker News thread inspired me to contemplate why Mastodon is everything we loved about social media before…
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TCP connection timeout mystery
For over a year, I’ve been investigating a strange issue with the internet in my apartment. I’m posting the details here in case someone more knowledgeable than me can solve the mystery. I live in graduate student housing with internet provided by the university campus. Usually things work reasonably well, with one…
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TCP/IP over audio
We present a simple to use implementation of networking across ultrasonic frequencies, by making use of Gnuradio and a microphone and speakers. This allows you to use TCP/IP , UDP across an audio link.
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No, it’s not the end of XMPP for Google Talk
There’s some recent discussion about the sky falling for XMPP at Google. See this blog post by Dan York for example. In reality, we don’t know the state of XMPP inside Google because they don’t share their use of XMPP with the XSF. …
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Device offers long-distance, low-power underwater communication
A new underwater communication and networking technique can achieve kilometer-scale ranges while consuming about one-millionth the power required by current communication methods.
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Telegram stalking
Update 20151216: This quick post got far more attention than expected. I regret not mentioning that the leakage can easily be prevented via a setting. In practice the problem remains, users in general will have no idea about this being a relevant setting to change and will stay with the default. The best discussion on…
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The tech behind building an independent, internet radio station
Oscar is on the web
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Building a legacy search engine for a legacy protocol
Most users who use the internet today, are mostly focused on three protocols, HTTP, TLS, and DNS.
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The text adventure game of exiting a Telnet session
We've all been there, right? You debug something, you try telnet to see if a port is open, and now you're stuck in a telnet session.