Release Notes:

OmniFocus 2 for iOS

Release Notes: What's new, updated, or fixed

This release adds the ability to specify an encryption passphrase separate from your sync password. Don’t set a separate passphrase until you are running OmniFocus 2.16 on all of your iOS devices and OmniFocus 2.7 (in public test as of Sept 1) on all of your Macs.