Blog of Julian Andres Klode

Debian, Ubuntu, Linux in general, and other free software

Archive for the ‘Uncategorized’ Category

Key transition

I started transitioning from 1024D to 4096R. The new key is available at:

and the key server. A very short transition statement is available at:

and included below (the http version might get extended over time if needed).

The key consists of one master key and 3 sub keys (signing, encryption, authentication). The sub keys are stored on an OpenPGP v2 Smartcard. That’s really cool, isn’t it?

Somehow it seems that GnuPG 1.4.18 also works with 4096R keys on this smartcard (I accidentally used it instead of gpg2 and it worked fine), although only GPG 2.0.13 and newer is supposed to work.

Hash: SHA1,SHA512

Because 1024D keys are not deemed secure enough anymore, I switched to
a 4096R one.

The old key will continue to be valid for some time, but i prefer all
future correspondence to come to the new one.  I would also like this
new key to be re-integrated into the web of trust.  This message is
signed by both keys to certify the transition.

the old key was:

pub   1024D/00823EC2 2007-04-12
      Key fingerprint = D9D9 754A 4BBA 2E7D 0A0A  C024 AC2A 5FFE 0082 3EC2

And the new key is:

pub   4096R/6B031B00 2014-10-14 [expires: 2017-10-13]
      Key fingerprint = AEE1 C8AA AAF0 B768 4019  C546 021B 361B 6B03 1B00

Version: GnuPG v2


Written by Julian Andres Klode

October 14, 2014 at 23:46

Posted in Uncategorized

hardlink 0.3.0 released; xattr support

Today I not only submitted my bachelor thesis to the printing company, I also released a new version of hardlink, my file deduplication tool.

hardlink 0.3 now features support for xattr support, contributed by Tom Keel at Intel. If this does not work correctly, please blame him.

I also added support for a –minimum-size option.

Most of the other code has been tested since the upload of RC1 to experimental in September 2012.

The next major version will split up the code into multiple files and clean it up a bit. It’s getting a bit long now in a single file.

Written by Julian Andres Klode

September 25, 2014 at 14:41

Posted in Uncategorized

APT 1.1~exp3 released to experimental: First step to sandboxed fetcher methods

Today, we worked, with the help of ioerror on IRC, on reducing the attack surface in our fetcher methods.

There are three things that we looked at:

  1. Reducing privileges by setting a new user and group
  2. chroot()
  3. seccomp-bpf sandbox

Today, we implemented the first of them. Starting with 1.1~exp3, the APT directories /var/cache/apt/archives and /var/lib/apt/lists are owned by the “_apt” user (username suggested by pabs). The methods switch to that user shortly after the start. The only methods doing this right now are: copy, ftp, gpgv, gzip, http, https.

If privileges cannot be dropped, the methods will fail to start. No fetching will be possible at all.

Known issues:

  • We drop all groups except the primary gid of the user
  • copy breaks if that group has no read access to the files

We plan to also add chroot() and seccomp sandboxing later on; to reduce the attack surface on untrusted files and protocol parsing.

Written by Julian Andres Klode

September 24, 2014 at 23:05

Posted in Uncategorized

Looking for HP Touchpad, Intel tablets, and other devices

If someone in Germany (or want to send it to Germany [at low costs]) still has (new) Touchpads to sell, I’d buy one or two of them at the reduced price (16GB: 99€, 32GB: 129€), or take them for free.

I promise that I will not sell them to others. I’m interested in WebOS, in running Debian and/or Ubuntu on those devices (for the extra fun factor), and lend it to family members for surfing, etc.

I also take other tablets and smart phones and various kinds of ARM and PowerPC hardware (I guess that’s all that’s interesting for me) for free, just send me an email if you have some and want to give them to me. This applies to Intel stuff as well, I’d really like to get some kind of WeTab/ExoPC, but can’t buy one currently (and they’re probably to outdated hardware-wise for buying to make sense).

Written by Julian Andres Klode

August 23, 2011 at 13:19

Posted in Uncategorized

Vettel world champion

Vettel made it – F1 World Champion 2010.

Written by Julian Andres Klode

November 14, 2010 at 16:53

Posted in Uncategorized


Get every new post delivered to your Inbox.