iOS & Mac OS X icon redesign : Password Sync Symbol

This is what Password Sync was looking for in their logo design

Password Sync is an iPhone and Mac app that syncs seamlessly passwords and other sensitive data across a user's devices. Basically, it does what Lastpass and 1Password do but using Apple's native technologies and with a minimalistic style. It also provides military grade encryption to make syncing safe for our users.

I'm in the process of designing a new version, Password Sync 2, exclusively made for devices running iOS 7 and OS X Mavericks (or more recent). Starting with my existing symbol (the "syncing key"), I'm looking for an updated symbology that will reflect Password Sync's new context. I've designed the original key and icons, not being a designer I'm looking for a little bit of input from people who know what they're doing.

*** Attachments ***
File 1 : Just a little showcase of iOS 7 aesthetic. For reference and inspiration.
File 2 : Current key symbol ("syncing key") vector for reference (that's what I'm looking for you to redesign; see note)
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