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what would be the best way to encrypt a cast, so that only a set of selected fids can decrypt it?

(ofc not in warpcast, warpcast would only see gibberish)

Sounds like Broadcast Encryption
https://crypto.stanford.edu/~dabo/pubs/papers/broadcast.pdf

customer support @supercast

trying to sound smart /doingnumbers

Researcher at https://chainlight.io 🔗‍💥🔦,
Building https://relicprotocol.com

Hmm I'm not seeing any 😕. Btw, if the recipient sets are small, you could always just encrypt the message for each recipient and broadcast the ciphertexts. The benefit of the above system is that ciphertext size is independent of the # of recipients.

thanks! any good js or python implementations?