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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

thanks! any good js or python implementations?

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.

oh yeah we are def ok with stuff that doesn't scale

im just looking for a good js lib to implement the encryption, haven't done it before

I can have a look around later today, but any standard encryption library based on ethereum public keys should work. You should just need to combine it with a fid -> public key lookup