Tag Archives: raspberry

Wordclock…

I made a Wordclock with MicroPython and an ESP8266, and one with a Raspberry Pi and Python.

I gave a talk at Grazer Linuxtage about the build process. You can see the talk on CCC’s media website or on YouTube.

The slides can be found here: https://flowolf.github.io/glt18-talk.

At some point I’m planning on releasing the source code and the vector files for the Wordclock face. Have still some cleaning up to do. In the mean time: there are several word clock projects out there that use a Raspberry Pi and Python; just search for them.

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Fail2ban country statistics…

I was lucky enough to seize a “Raspberry Pi Colocation“-slot for my Raspberry Pi.

To secure it further I just recently installed fail2ban.
The software basically detects login attempts and blocks the IP for some limited time in the future. This prevents a depletive password guessing for server logins.

I was interested in the password-guessers` country of origin. Now I can confirm, at least for my Raspberry Pi, that most attacks come from China.

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    110       CN
      2       UA
      2       RU
      2       DE
      1       VN
      1       PE
      1       KR
      1       CZ
      1       BD

the quick and dirty command for this looks like this: (you need to have ‘whois’ installed)

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for i in `sudo cat /var/log/fail2ban.log | sed 's/.*[Bb]an \(.*\)/\1/' | sort | uniq | cut -d ' ' -f 1 | grep "\."`; do
  echo $i; whois $i | grep country\: |head -n 1 >> fail2ban_ctry.log ;
done
cat fail2ban_ctry.log fail2bancry2.log | sed 's/country:  //g' |sort | uniq -c |sort -nr

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Bitcoin Paper Wallet Treasure Chest…

The Bitcoin Paper Wallet Treasure Chest
The Bitcoin Paper Wallet Treasure Chest
One of the challenges with bitcoin is to store them securely. There have been several well known incidents where Bitcoins have been stolen. It is no mystery. Bitcoin IS money! It’s the same with Euros or Dollars, when you have it lying around it will eventually be missing.

There is a twist with bitcoin to regular money. With Bitcoin one single piece of information is enough for the thief to steal your Bitcoins: Your private key. With Bitcoin it’s about keeping this piece of information secret.

Continue reading Bitcoin Paper Wallet Treasure Chest…

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