The PLAIN mechanism defines a simple username/password mechanism that lets a server authenticate a client. PLAIN makes no attempt at security or confidentiality. It is intended for use on internal networks where security requirements are low. The PLAIN mechanism is defined by this document: \m[blue]http://rfc.zeromq.org/spec:24\m.
To use PLAIN, the server shall set the ZMQ_PLAIN_SERVER option, and the client shall set the ZMQ_PLAIN_USERNAME and ZMQ_PLAIN_PASSWORD socket options. Which peer binds, and which connects, is not relevant.
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