Default kSecAttrAccessible value for keychain items?

Update: As of a few years ago, the default is now kSecAttrAccessibleWhenUnlocked.

According to the Session 209 (Securing Application Data) video from last year's WWDC, the existing data defaults to kSecAttrAccessibleAlways (so you'll need to update the accessibility class as necessary).

I've tested this on IOS 8.1 and default value is kSecAttrAccessibleWhenUnlocked.

I've just tested this on iOS 5.1 and 6.0, the default is now kSecAttrAccessibleWhenUnlocked.

However, I think it is always better to set an explicit kSecAttrAccessible, rather than relying on defaults to be secure enough for you.