[MacPorts] #49233: selfupdate fails with "Failed to verify signature for MacPorts source"

[MacPorts]

#49233: selfupdate fails with "Failed to verify signature for MacPorts source"
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  Reporter:  n.gilbert@…     |      Owner:  admin@…
      Type:  defect          |     Status:  new
  Priority:  High            |  Milestone:
 Component:  server/hosting  |    Version:  2.3.3
Resolution:                  |   Keywords:
      Port:                  |
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Comment (by marco.outatime@…):

 Hi, I just want to notify that at the moment I'm unable to use Macports at
 all. I've just installed it from scratch on El Capitan. The "port search"
 is broken and requires "port selfupdate", which cannot be done because of
 the signature failure reported in this thread.
 If you know a workaround let me know. Thanks.

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Ticket URL: <https://trac.macports.org/ticket/49233#comment:152>
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