How secure is Flex? August 09, 2019 22:54 Flex uses 256-bit encryption for all your data. That's the same level of security as governments and militaries! Related articles How does Flex use my data? Why does Flex need my bank account information? Does Flex have a customer support number? When will my rent get paid? How do I qualify for Flex? Comments 0 comments Article is closed for comments.