This is an interesting idea, but since the client ultimately gets both halves one can just recombine them out-of-band. (If each half is displayed 50% of the time, it shouldn't require many screenshots to get both. And that assumes you have a 100% secure runtime / SSL chain for delivering the images to the app, which is highly unlikely.)
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This is an interesting idea, but since the client ultimately gets both halves one can just recombine them out-of-band. (If each half is displayed 50% of the time, it shouldn't require many screenshots to get both. And that assumes you have a 100% secure runtime / SSL chain for delivering the images to the app, which is highly unlikely.)
I think you are over-estimating the technical capacity of most users of SnapChat.
This provides 'good enough' security for most people's uses.
But it's very easy to write an app that's called "SnapChat Self-Destructing Image Saver" and then the feature becomes pointless.
http://en.wikipedia.org/wiki/Smart_cow_problem
Thank you for that wiki reference, I'm adding 'smart cow' to my lexical bestiary.
maybe you could generate a new set of randomized halves every second, so that getting two matching halves is less likely.