Hello @gleenk,
Thank you for contacting us.
In the current version or in the pro version of our plugin, we do not have the provison to save the data encrypted.
But you may do it on your own risk, if you are a developer you can use the filters that we have provided on before storing the data to database and before showing the data in the back office.
below are the two mention filters
1) Before saving the data to the Database
vsz_cf7_posted_data
2) Before showing the data in the back office
cf7d_entry_value
The above two mentioned filter will help you to get the records and then you can apply your encryption and decryption functionality.
Hope this will help you.
If you still have any queries, feel free to get back to us.
Regards,