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Encrypt it with a symmetric key, and then encrypt the symmetric key separately with each of your friends' public keys.





But then if just one of your friend's private key is stolen, you lose control of everything you wrote, past or present.

Well, yeah. That's what sharing the things you've written with them is.

Well, there are algorithms that support perfect forward security.... but nah

This is a good argument for not rolling your own.



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