I've been thinking of writing a "secret storage" system for Android -- does such a thing already exist? I've used Zetetic's open-source Strip tool for many years on PalmOS, and found it handy, so I'd like to have something like that on Android.
Ideally, I would use SQLite databases to store the info, but it seems that there's no way to encrypt those database files. This is a huge security hole. SD card storage of course can be compromised, but even on-device storage is available to a sophisticated attacker who actually has the physical phone. I see that a ticket was opened about this in Feb 2008, but apparently closed shortly thereafter with a somewhat short-sighted analysis of the security problem. Would it be futile to re-open such a ticket? Does anyone else have a solution to this?
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