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use HMAC digest to sign messages instead of cleartext key...
use HMAC digest to sign messages instead of cleartext key also some cleanup of Session code security doc updated as well. Buffers do not get digested, so large (non-copying) messages should not cause performance to suffer too greatly.

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logtopics.rst
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Log Topic Specification

we use pyzmq to broadcast log events over a PUB socket. Engines, Controllers, etc. can all broadcast. SUB sockets can be used to view the logs, and ZMQ topics are used to help select out what to follow.

the PUBHandler object that emits the logs can ascribe topics to log messages. The order is:

<root_topic>.<loglevel>.<subtopic>[.<etc>]

root_topic is specified as an attribute