Only problem I have with AppStore is that it requires my password for free downloads. Paid download? Hell yes, require my password if I haven't typed it in for 15 minutes.

I have kids. I'm happy they _always_ ask for a password... Free apps can be malicious e.g giving away location to parties unknown. But still you're right - this could be an option users can decide.

This is part of a deeper problem with most mobile OSes. I might give my phone to somebody so they can make a quick call or look something up online. However, I don't really want them being able to dig through my history or be automatically logged into my email etc.

If I had a child I'd want to be able to let them use my phone but only in a special mode that allowed access to a limited number of whitelisted websites & apps.

Schneier today:

http://www.schneier.com/blog/archives/2012/07/all-or-nothing... http://cups.cs.cmu.edu/soups/2012/proceedings/a2_Hayashi.pdf

But: yes.

I'd like my phone to offer a few different "shells" of access:

- Emergency calls.

- "Share" or "play" mode. Selected photos or apps.

- "Mobile" -- ready access to stuff I need, but not distractions (the "Car Panel" on some Android phones is somewhat like this, but I'd appreciate if it didn't encourage use while driving).

- "Full" complete and potentially immersive access.

There are currently a few projects ongoing with enabling VMs on smartphones. The way it was thought is that you would put your corporate stuff on a protected VM that would have no external app install, and the rest (games, social networks...) would be on the "fun" VM. That way, the company data would be better protected.

This isn't a popular sentiment but the way I solve this is not to let anyone borrow or touch my devices.

iOS 6 removes the needs to enter passwords for app updates. finally.

I haven't lied if I say it's one of the sweetest things I've found in iOS 6.

The good thing about the AppStore password timing out after 15 minutes is that you can hand your child the ipad/iphone/etc. and not get a surprise $5,000 itunes bill.

That's an edge case, though. Why not make it a configurable option?

This is definitely not an edge case. How many kids do you see at the grocery store with their noses in an iPhone will their parent(s) shop?

That said, it would be nice to have the option of telling the app to cache your credentials.

Edge case was perhaps the wrong term. It certainly is not a majority case. As I said- make it an option, everyone is happy.

Not the person who turns on the option to make their life easier and then complains because their kid spent $400.

?! Are you suggesting that everyone should be denied the choice because some people are unable to make informed decisions?

This is confusing authentication and authorization. Is this phone legitimately tied to this Apple ID? Yes. Is the owner of the account authorized to make such a purchase? No.

A short appstore PIN could solve this much more easily.

I'm not so sure having _yet another_ PIN for users to remember would be a good idea. And besides, a short PIN would be far easier to deduce by looking over a person's shoulder.

It is a configurable option (Settings -> General -> Restrictions)

Yeah, it's configurable between "Demand my password again if 15 minutes has passed" and "Demand my password again immediately." You can tell you're going in the wrong direction when you first have to "enable restrictions" hoping to relax the restriction. I take it you've never actually tried to configure this option.

Holy not an edge case Batman! That is most definitely a very common reason to timeout the password...

Oh my god that is so not an edge case.

How about using fingerprint scanner for authentication? Or face recognition using front-facing camera? It's 2012 after all.

The Samsung Galaxy S3 has face recognition. It can be unlocked using a photo of the user. Google Images search, point cam at laptop, bingo you're in.

They "fixed" this in JellyBean.

too many false positives.

Now, an SD card with a certificate plus face recognition might be ok ;-)

Why an SD card? The phone itself is already a portable device you control.

It depends on the app but at least in the areas I work (business apps relating to tracking money) I wouldn't assume that device authentication is sufficient.

But for biometrics, keep in mind that biometric systems are currently seen as the most subject to false positives of any authentication system out there with the possible exception of improperly maintained and insufficiently strong passwords.