Make every word tell.

“Vigorous writing is concise. A sentence should contain no unnecessary words, a paragraph no unnecessary sentences, for the same reason that a drawing should have no unnecessary lines and a machine no unnecessary parts. This requires not that the writer make all his sentences short, or that he avoid all detail and treat his subjects only in outline, but that every word tell.”

— “Elementary Principles of Composition”, The Elements of Style

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The Certification Authority Authorization (CAA)

The Certification Authority Authorization (CAA) DNS Resource Record allows a DNS domain name holder to specify one or more Certification Authorities (CAs) authorized to issue certificates for that domain.

How to check a domain’s CAA record which is identified by a type257 DNS record:

$ dig +short -t TYPE257 google.com
\# 19 0005697373756573796D616E7465632E636F6D

For more information:

  1. http://en.wikipedia.org/wiki/List_of_DNS_record_types
  2. http://tools.ietf.org/html/rfc6844
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