2021-04-28 A repeatable 36 kilometer ride 1 month ago
Yesterday I cycled the same ride as I did last October and a few times since then. It was a good way to spend a few hours riding on our kings day. I stopped along the way to drink some water and relax. It's still 36 kilometers and the average speed according to the speedometer on my recumbent bicycle was 21.77 kilometer per hour.
2021-04-27 HackTheBoxCTF writeup: Forensic challenges (the ones I tried) 1 month ago HackTheBoxCTF writeup: Forensic challenges (the ones I tried)
2021-04-27 HackTheBoxCTF writeup: Hardware challenges 1 month ago
I found a writeup of the HackTheBox & CryptoHack Cyber Apocalypse 2021 I participated in at How HackTheBoxCTF Exposed The Marriage of Saleae And Hardware - Equus 🐴 (Annie) but I did some things a little different so I decided to share how I did it.Read the rest of HackTheBoxCTF writeup: Hardware challenges
2021-04-27 Played in the HackTheBox & CryptoHack Cyber Apocalypse 2021 1 month ago
A CTF or Capture the flag is an information security competition where puzzles are offered that have to be solved with techniques from information security. This can range from a simple knowing where to look for clues in data to having to use the latest exploit techniques against systems to get access. The solution is usually a digital 'flag' that proves you solved the puzzle. A co-worker who has been at the 'receiving end' a few times of the CTF challenges the SURFcert team creates with some help of me invited a number of people at work to the HackTheBox & CryptoHack Cyber Apocalypse 2021. And I decided to join! We dove into the challenges a number of evenings. I solved a few hardware challenges on my own, and I did parts in solving other challenges. I learned about .sal files and logic analyzers. And I learned cracking a (not too big) public RSA key is doable these days. Where others wrote bits of python to solve things I used grep and awk. But in the end we got there. Our team ended in the top 6% which is not bad for doing this on weekday evenings besides our jobs and other bits of life. I posted about this on linkedin in Dutch: Collega Simon Kort BICT nodigde mij uit voor het meedoen in deze CTF.
2021-04-24 Getting some new countries on the 17 meter band, 10 meter opening 1 month ago
With a bit of trying and retrying I tuned my home endfed to the FT8 frequency in the 17 meter amateur band. I'm chasing 'slots' on that band: countries I haven't worked on that band before. Today I got the Balearic Islands, Wales, Kenya, Indonesia and Lebanon in the log, all new on this band for me. Before that there was a nice 10 meter opening during the day, where I worked several European stations. Nice to see good propagation! Update 2021-04-25: On Sunday I tried FT8 on 17 meters again, this got me Thailand as a completely new country! And Belarus, Latvia, Lithuania new on the 17 meter band.
2021-04-14 Year 2038 is coming! 2 months ago
Interesting kernel message in Linux today:[ 3906.977410] ext2 filesystem being mounted at /media/koos/disk supports timestamps until 2038 (0x7fffffff)So that filesystem (and lots of others) will give issues in 2038. Things need work before that date!
2021-04-10 Cleanup of my gpg private key 2 months ago
I learned about changes in GPG needing some updates to private keys so I loaded the private key for 0x5BA9368BE6F334E4 in a backup keyring and tried to find out what needs to be done. The explanation at Fixing old SHA1-infested OpenPGP keys seems to have the important parts. Make sure the preferences are set correctly (no SHA1) and do a 'clear' on the key. I took the chance to change the expiry date to something a bit more in the future, set the e-mail address that I now use as primary and updated the weblink to my homepage to https://idefix.net/. I also updated the details on PGP - Koos van den Hout so these can be verified.
2021-04-08 Stopping with NTP servers at work 2 months ago
For almost 20 years I was involved with the running of NTP time servers at work. But the hardware aged and my job is no longer in systems administration and not in the department actually housing the timeservers. So, time to stop doing it. The pool ntp server has been retracted, DNS names removed and soon I will make one final trip to shut down hardware one last time and remove it from racks. The end for ntp.cs.uu.nl and others. I still run an NTP server at home which is available in the IPv6 NTP pool. That server also compared itself to one of the servers at work so it has been reconfigured. I added a few upstream servers and made sure all of them are reachable via IPv6. The log of NTP service at cs.uu.nl was kept, here is the final version:
Date Event 8 Apr 2021 DNS names for ntp service at cs.uu.nl removed 2 Apr 2021 Announcement posted to system administration mailing list that ntp service at cs.uu.nl will stop 24 Sep 2014 A second stratum-1 ntp appliance is brought on-line, galileo.cs.uu.nl 28 Nov 2011 Fixed the networking for stardate, the full time lab is up and running. 23 Nov 2011 The antenna cable connectors are soldered on which results in a working setup after a few tries. Stardate is better at reporting the state of the power to the GPS antenna, but has no working network. Huygens has working network and serves time to metronoom. 22 Nov 2011 The server ntp.cs.uu.nl is active at its new IP. Our own GPS reference doesn't work yet: we still need to solder the right connectors on the antenna cable. The server is added to the ntp pool and traffic starts to flow a few hours later. 15 Nov 2011 The ntp servers are moved to their new location 14 Nov 2011 The ntp servers are switched off 13 Nov 2011 We retract ntp.cs.uu.nl at its current address from the pool because the serverroom will move physically, the ntp equipment will move to a different location and the IP will change to deal with the traffic better 18 Sep 2011 Stats for doei.cs.uu.nl, five years after withdrawing it from the ntp pool 19 Sep 2010 Stats for doei.cs.uu.nl, four years after withdrawing it from the ntp pool 4 Mar 2010 The turkish adsl provider ttnet falls off the Internet for a few hours, traffic falls from 2000 packets/second to 100 packets/second in that time 22 Jan 2010 We volunteer ntp.cs.uu.nl for the turkish part of the ntp pool. Traffic explodes, peaks over 5000 packets/second 18 Sep 2009 Stats for doei.cs.uu.nl, three years after withdrawing it from the ntp pool 28 Jul 2009 ntp.cs.uu.nl back at full speed in the ntp pool, firewall configuration fixed 15 Jul 2009 rear doors of racks closed again 2 Jul 2009 10:00 serverroom airco has problems with high temperatures (28-30 C), we open rear doors of racks which makes the temperature go down a bit in the racks but the airco still has hard work Mar 2009 ntp.cs.uu.nl tuned down in the ntp pool to avoid firewall issue 18 Sep 2008 Stats for doei.cs.uu.nl, two years after withdrawing it from the ntp pool 17 Jan 2008 huygens.cs.uu.nl has a GPS reception failure, fixed with a software update 18 Sep 2007 Stats for doei.cs.uu.nl, a year after withdrawing it from the ntp pool 11 Mar 2007 airco failure serverroom 5 Mar 2007 all ntp servers moved to one rack close together for temperature stability 20 Jan 2007 airco failure serverroom 9 Jan 2007 huygens.cs.uu.nl added as stratum-1 23 Dec 2006 airco failure serverroom 29 Nov 2006 powerfailure in our building 1 Nov 2006 metronoom.dmz.cs.uu.nl takes over as ntp.cs.uu.nl and joins pool.ntp.org ~ 24 Oct 2006 antenna cable to stardate.cs.uu.nl reconnected ~ 6 Oct 2006 ntpd on stardate disabled: free running clock starts to differ too much from correct time ~ 25 Aug 2006 antenna cable from stardate.cs.uu.nl disconnected because of building and recabling activities 1 Aug 2006 doei.cs.uu.nl leaves pool.ntp.org 19 Aug 2003 doei.cs.uu.nl joins pool.ntp.org 10 Jan 1999 stardate.cs.uu.nl set up as stratum-1 with GPS time reference
2021-04-07 The NTP ham clock is ticking 2 months ago
Recently the parts for the NTP ham clock I saw in the Electron magazine arrived: an ESP32 module and a TFT display. It took a bit before I had time to actually do something with them but recently I put the modules on breadboard and started making the needed connections. There are not a lot of those, only 8 wires need to be connected between the ESP32 microcontroller and the TFT display. After some fiddling it worked and I managed to program it all with the settings I like, such as the right timezone rules for the Netherlands, 24 hour display on both clocks and it fetches the NTP time from the NTP server in the shed so it doesn't rely on outside connectivity. Now to find a case for it and wire it neatly.
2021-04-05 I participated in the EA RTTY contest 2021 2 months agoItems with tag english before 2021-04-05
Last weekend was the EA RTTY Contest 2021 edition. I decided to participate because I appreciate the contests organized by the Unión de Radioaficionados Españoles. Participation time was somewhat limited due to other things happening in the easter weekend. In the end I made 79 contacts and entered my log in the 'SINGLE ALL LOW POWER DX' category. As 'low power' is defined as 'below 100 watts' and my RF amplifier isn't working at the moment this is the fitting category. Update 2021-05-05: Results are in: 71 valid contacts, 117 qso points and 51 multipliers: rank #225 of the single operator multiband low power DX category.