For understanding public key in general, you may want to read http://en.wikipedia.org/wiki/Public-key_cryptography
In MNet, public keys are generated and exchanged automatically between MNet peers. If for any reason you need to know its value, visit http://your.moodle.site.with.mnet.enabled/mnet/publickey.php
Moodle networking (MNet)
sso in moodle
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