Based on test version at https://mwcore-securepoll-test.wmflabs.org
In the poll creation page the signing key and encryption keys are asked for. As discussed in the design meetings and https://www.mediawiki.org/wiki/SecurePoll_Redesign#Phase_1:_Poll_Design_Wizard keys should be auto created (and private key displayed or saved, personally I think it should be saved to server). Many poll creators are not versed in key creation (and should not be expected to be).
Version: unspecified
Severity: enhancement
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=68118