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Data lifecycle questions, not only for Blockchains
In any data-centric applications, understanding the data lifecycle (also as part of the product lifecycle) is important, especially when trust or traceability are also goals. If Blockchain should play a role, then the requirements associated with the data lifecycle can even become a decisive factor: Either adapt the data model or the processes, or, if…
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Tutorial: Cyclic Redundancy Check (CRC) Computation
Introduction Cyclic Redundancy Checks fall into the same category as parity bits, check digits, and checksums: Their use is to detect transmission errors. Depending on the error model assumed (i.e., what types of transmission errors are to be expected, which typically depends on the transmission media), different forms of checking are appropriate. Before starting to…
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Compact Archives Widget for WordPress
The standard Archives Widget looks like the image right here. It works well when only a few months are to be displayed. However, it fails if your blog’s history goes back a long way. Here is aΓΒ quick way to get down from 12 lines per year to 1, increasing usability and page size.
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NTS and dynamic IP addresses
Good news is that NTS relies on DNS names, no longer “naked” IP addresses. But what happens when the DNS name changes, pointing to a different IP address? A look at the protocol, the Chrony source, and the implications.
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Compact Archive for WordPress
The default WordPress Β«ArchiveΒ» block becomes very long and narrow, when months accumulate. Here is an easy way to make it more compact.
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Ubuntu Apache update broke “Listen” command
[Updated 2013-07-28: Corrected “https” to “http” in Listen] After a recent Apache update, Apache 2.2.22 (on Ubuntu 12.04 LTS “precise”) the following message appeared in the Apache error log: [error] Server should be SSL-aware but has no certificate configured [Hint: SSLCertificateFile] ((null):0)
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chrony NTS certificate reload
The chrony NTS daemon has no way to automatically reload its NTS certificate. A quick hack fixes this.
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DNSSEC made easy: Converting an existing DNS zone to Inline signing with BIND
DNSSEC Γ’β¬β the security extensions to the trusty Domain Name System (DNS) upon which almost all Internet transactions rely Γ’β¬β is often considered hard to set up. My own setup has been very dated, using complicated scripts which needed to run after every change to the zone file. There was time to change this. Modern…