I'm exploring various ways to implement cryptographic read receipts, that would be used to tell the content producer that the content was viewed. In addition to feedback reporting, a response might also provide a decryption key useful for the client to decrypt additional content.
Both the advertisement and featured content could be
- An email
- Facebook post
- Video (advertisement?)
Said another way, my strategy is to embed a redemption code within the advertisement, which would then unlock the content of interest.
I believe a variant of broadcast encryption could be used, or perhaps even DRM could be leveraged to accomplish this.
Is there any previous implementation, field of study, or thought I should search for prior to assembling something of my own creation?