Option: Go down Cryptography path

[hadasz]

Overview

If nothing existing is found, find some cryptography protocols that might fit into this

Reference

• Reference
• To issues
• That might be

Questions

Are there existing protocols that would work? Is there a slight modification to an existing protocol that could work? Is doing this cryptographically worth it? Is it feasible in terms of performance? Feasible to implement?

Assumptions

• There is a way to use cryptography to de-incentivize someone from sharing their token off chain.
• Timeboxed sizing

Acceptance

• Bullet point list and short description of how the architecture could work.
• Write up in Github (markdown doc) to use as the basis for maybe a medium article.

Tasks

• Find words and phrases regularly used in this context: A few are, "non-transferable token", "proprietary certificate", "collateral certificate", "digital watermarking", "Data Dissemination Control", "LSB Substitution Pattern"
• Think. Play around with things until something comes together
• Write architecture up. If it is compelling enough, write it into a github document

[hadasz]

"Implicit Certificate"

[hadasz]

Search Terms: "client-side watermarking", "secure watermark embedding"

[hadasz]

Best Candidate as of now: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.139.3168&rep=rep1&type=pdf

nevermind - it does not have any proven security for the encryption of the video itself

[hadasz]

Study on how LUT client side embedding is not secure

GA Based blind digital watermarking “Forensic tracking watermarks” - watermarks for tracking ownership “Secure watermark embedding” - sending encrypted content, that when decrypted, leaves a watermark

BUYER-SELLer watermarking protocol With Trusted Computation

BroadCast Monitoring FingerPrint Embedding and Decryption for Secure Video Distribution

[hadasz]

Most promising paper as of now: [TTP-Free Asymmetric Fingerprinting Based on Client Side Embedding ](TTP-Free Asymmetric Fingerprinting Based on Client Side Embedding)

Uses additive homomorphic encryption to create a decryption key for each individual user. When the user uses this decryption key to decrypt the video, the fingerprint is implicitly embedded into the video. Homomorphic Encryption allows this system to be possible without a trusted third party. A client will send their encrypted fingerprint to the server. The server uses homomorphic encryption to devise a decryption key containing that fingerprint. The user uses this decryption key to decrypt the video, thereby imbedding their personalized watermark into the video.