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Re:Show HN: I'm 17 and I created an iOS app to hide one phot... by wingerlang on Wednesday November 09, 2016 @12:52AM (#12906508)
> The app works by minutely altering the first photo to conceal the other.

What does this mean?

From the end-users perspective, I guess they still need the app to do this, at which point you could just send two images and no one would know anyway - and it'd save you some time.

Re:Show HN: I'm 17 and I created an iOS app to hide one phot... by andars on Wednesday November 09, 2016 @02:04AM (#12906925)
Re:Show HN: I'm 17 and I created an iOS app to hide one phot... by mike_eirinberg on Wednesday November 09, 2016 @09:40PM (#12917255)
Yup, on point. This is a method of Steganography.