Are the iPhone mobile apps MS Word, MS Excel, Pages/Numbers (both from Apples, Inc.) as secure as their Windows Desktop version

We would like to know if we save a MS Office document with 128 bit AES encryption password in our Windows Desktop MS apps, and the mobile apps opens these documents, does it mean that the apps also support AES encryption?  (including if opening in the mobile apps of Pages and Numbers from Apples, Inc.)
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btanExec ConsultantCommented:
iPhone itself already support AES. Regardless of where the iWork document was created or password protected, it will enjoy cross-platform compatibility with Pages, Keynote, and Numbers. It is Apples themselves, so no surprises.

For Microsoft support itself, it came up with Supported Apps (required user to have Office 365 subscription) to view their document @ . In fact, you only need the Office365 subscription to create or modify files. Otherwise, the Apps works as a reader. It will be good to test out Apps for iPhone to see if it will allow access to the password-protected file, even if in read/only mode. See
Only Office for Windows and Office for Mac can open password protected documents. None of the other Office variants for browser or mobile can handle them....

Update:  Office for iPad DOES open password protected documents … as it should.
Realistically, the lack of password support in Office Mobile and Office Web Apps is because Microsoft doesn’t want to spend the time and money necessary to make it happen.
Privacy and Security in Microsoft Office has a lot more on password protected documents and other ways to maintain email and document privacy.

Regardless, if the apps can open the password encrypted doc, with prompt appearing, it simply means it support the crypto (or secret algo) required to decrypt and open properly that document. Especially if it can prompt means it is already knowing the format of the protected file like iOS knows how to open ZIP files (better to use iZip Apps) . Most of the times, custom Apps is created by others as it provides more features, and wider interoperability (not just crypto but also transparency e.g. Dataviz in the OS - as compared to relying on native iOS support...

To drill into Apples security, its whitepaper is handy -
rayluvsAuthor Commented:
Please advice on viability in iPhone mobile apps if security encryption exist. The iPhone apps we would like EE opinion are: MS Word, MS Excel and Apple own Pages/Numbers apps.

Are these as secure as their Windows Desktop counterparts?
This everymac article form October 2013 suggests that the iPhone is capable of reading MS files, but not editing them.
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rayluvsAuthor Commented:
Thanx for the info.  Unfortunately, the article is a couple for years old.  Now the iPhone apps in question, MS Office and Apple compatible Word/Excel apps, can open and edit Desktop version  of Ms Office documents.

What we would like to know if the apps in the iphone in relation to opening these Ms Office files are as secure as their Windows Desktop version.
Natty GregIn Theory (IT)Commented:
The answer to the question above is yes.
btanExec ConsultantCommented:
definitely secure by apps and iOS. the caveat is there is vulnerability in both as well. if the device is jailbroken, forget about security lockdown, in other words, not secure for both.
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