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DDoS: What we can do to prevent it
Distributed Denial of Service, DDoS for short, is the shooting star in today’s Internet nightmare gallery. Here is a quick overview over what each and everyone of us can do to prevent his. And some hints at manufacturers and researchers.
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Modern ejabberd configuration
ejabberd is one of the most widely used XMPP servers. It is easy to get it running for text-based messaging with a few configuration changes. However, to obtain a smoothly running modern feature set is harder. The configuration documentation is detailed, but even for a seasoned systems administrator or XMPP guru, a lot of questions…
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Automatic SOGo configuration for iOS (iPhone/iPad) and MacOSX (and more)
Apple provides a lot of autoconfiguration for their groupware (Mail, Address Book/Contacts, iCal Calendar) on their Desktop OS X systems and their mobile devices. However, some of this autoconfiguration was there before there were agreed-upon standards, which especially plagues Contacts and Calendar when working with the excellent SOGo groupware. Especially the AddressBook on OS X…
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How to create DNSsec DANE TLSA entries
Rationale One of the most promising features for DNSsec is the ability to tell a client which certificate to expect when connecting via Transport Layer Security (TLS). RFC 6698 specifies how TLS Authentication information can be put into DNSsec. So when you ask for the IP address of the server, you can simultaneously obtain the information which…
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Dealing with Apple .mobileconfig Configuration Profiles Quirks
During the preparation of the iOS/OS X SOGo autoconfiguration tool, I noticed a few quirks. In order to make it easier for others to use these profiles, I am documenting what is missing in the official documentation or does not work according to specs (i.e., which is broken), in the hope that .mobileconfig files will…
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DEFCON Voting Village 23 Panel
There was a DEFCON Voting Village panel «If I can shop online, why can’t I vote online?» which I found extremely important to read or listen to. Not just for me, in fact, for anyone talking about electronic voting. Here is a transcript for those who prefer reading (or searching for keywords).