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DNS doesn't “propagate”
DNS "propagation" is actually caches expiring
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Please do not put IP addresses into DNS MX records
This blog is written by Hanno Böck. Unless noted otherwise, its content is licensed as CC0 .
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Hunting down the stuck BGP routes
BGP is the glue between all of the thousands of border routers that make up the internet (you can find this post (battleships) and this post (EvE) as a crash course on how BGP works).
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Can We Stop Pretending SMS Is Secure Now?
SMS text messages were already the weakest link securing just about anything online, mainly because there are tens of thousands of employees at mobile stores who can be tricked or bribed into swapping control over a mobile phone number to someone else. Now we’re learning about an entire ecosystem of companies that…
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Microsoft Silently Dropping Emails – a Sad but True Story (2020)
From time to time Microsoft decides to block or even silently drop emails that are sent by my selfhosted email server. It’s always a pain and takes a lot of effort to deal with it. This time I decided to…Read more ›
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ISP announces 86% slowdown “in line with others”
Altice wins the race to the bottom.
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WhatsApp and most alternatives share the same problem
Shall I migrate to Signal, Threema or Telegram? No, because they all have — WhatsApp included — the same problem: They are walled gardens. Imagine a world where for each mail recipient using a separate domain, I would need separate mail client? Or in other words: Gmail users can only communicate with Gmail users…
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How Does FaceTime Work?
As an ex-pat living in Denmark, I use FaceTime audio a lot. Not only is it simple to use and reliable, but the sound quality is incredible. For those of you old enough to remember landlines, it reminds me of those but if you had a good headset. When
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Where's the fastest place to put my server? How much does it matter?
Using my own web server accesslogs and public latency data to get a quantitative answer and why roundtrips are such a pain.
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Let's Encrypt's old root certificate is expiring
On 30th September 2021, the root certificate that Let's Encrypt are currently using, the IdentTrust DST Root CA X3 certificate, will expire. You may or may not need to do anything about this Root CA expiring, but I'm betting a few things will probably break on that day
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Plain Text Protocols
If you haven't noticed already I really love plain text so I thought I would find some plain text protocols that are used in different software systems. The Redis Protocol specification states it best by describing its own protocol, but this applies to all of the plain text protocols I will cover.
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The Rise of One-Time Password Interception Bots
In February, KrebsOnSecurity wrote about a novel cybercrime service that helped attackers intercept the one-time passwords (OTPs) that many websites require as a second authentication factor in addition to passwords. That service quickly went offline, but new research reveals a number of competitors have since…
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VPN over SSH? The Socks Proxy
Some resources on the internet might be only accessible from clients with particular IP addresses. For example, suppose you want to…
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Change your MAC address with a shell script (2019)
Sometimes I'm at a coffee shop and get locked out of the wifi, after an hour or two has passed. Rather than spending 2 minutes/week entering terminal commands, I thought it made sense to spend a few hours figuring out how to make it take one minute a week, instead, via AUTOMATION
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DDoS-Guard to forfeit internet space occupied by Parler
Parler , the beleaguered social network advertised as a “free speech” alternative to Facebook and Twitter, has had a tough month. Apple and Google removed the Parler app from their stores, and Amazon blocked the platform from using its hosting services. Parler has since found a home in DDoS-Guard , a Russian digital…
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Incenser, or how NSA and GCHQ are tapping internet cables (2014)
A weblog about Signals Intelligence, Communications Security and top level telecommunications equipment
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Superhighway84 – a Usenet-inspired decentralized internet discussion system
Superhighway84 is a USENET-inspired decentralized internet discussion system, featuring a retro text user interface and powered by IPFS and OrbitDB.
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It’s time to stop using SMS for security
By now most infosec professionals are aware of various ways SMS text messaging can be hijacked. For example so-called “SIM Swap” attacks…
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DIY Mail
I have another post about half-written that I will finish up and publish soon, but in the mean time I have been thinking today about something that perennially comes up in certain orange-tinted online communities: running your own mail server.
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Raspberry Pi WiFi to ethernet bridge
The goal is to connect a non-WiFi computer to a WiFi network using a Raspberry Pi. We will use a Raspberry Pi 4 Model B as a bridge between the non-WiFi computer and the WiFi network. The Raspberry Pi connects to WiFi and shares its connection with other computers over Ethernet. These instructions were only tested and…
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I’m putting a WiFi router into a wall charger
Read the updated story here
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Anatomy of a Linux DNS Lookup
Since I work a lot with clustered VMs , I’ve ended up spending a lot of time trying to figure out how DNS lookups work. I applied ‘fixes’ to my problems from StackOverflow without really understanding why they work (or don’t work) for some time.
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The Drunken Bishop Algorithm
There’s a tradition in my family that everyone takes a turn stirring a secret wish into the yearly christmas pudding . It’s important that the wishes remain secret to the wisher or the pudding magics wont work so since moving to America I’ve implemented a new way of hashing my wish so it can be stirred in via text…
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Imaging Cygnus a at 8.45 GHz with ATA
Earlier this year, I published a post showing our results of the interferometric imaging of Cassiopeia A and Cygnus A at 4.9 GHz with the Allen Telescope Array . Near the end of July, I decided to perform more interferometric observations of Cygnus A at a higher frequency, in order to obtain better resolution. I chose…