A place for developers to talk about building on Farcaster.

/dev

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)

A rudimentary v1:

- create a new client and request a new signer for each user in the secret group

- client manages a key in its backend to encrypt all casts posted via client

- users are able to read decrypted versions of the casts

- Map it to a FIP-2 not on Warpcast to reduce timeline spam

2. whats a good algo for that? ideally with a js implementation out of the box
4. will you hate us if we use it as a growth hack?

Depends on the nature of how you want membership to work — do you want it to be exclusively casts available only to people who are in the group, or one where any prior/future members can see/post?

BDFL of Quilibrium, Eng @ Farcaster, ex-Coinbase, always opinionated, never hydrated

/quilibrium

2. no idea cc @cassie 

4. nope, but people might mute / unfollow users doing a lot of it