My colleague Josh Good jgd may be able to share more information with you.
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We are just finalizing a formal paper. Qlik Sense Cloud is very secure by using a variety of industry best practices to ensure only you (and the people you authorize) can gain access to your data. Perhaps the best proof point is we (Qlik) use Qlik Sense Cloud ourselves to for our own sensitive information. I will contact you directly in case you have any specific questions.
Any update on when we can expect to see a formal paper?
Only info I can find is that Cloud is based on AWS, but am interested to know things like:
Where is data stored and encrypted
How is access partitioned between Cloud users
Is traffic encrypted on upload (SSL?)
What protocols are being used and where