Use different public key for each contact.
Use different public key for each contact.
For example, I have the public key "036156" for my friend Manolo. And have the public key "194618" for my friend Petro.
So to speak, different public identities in each contact.
It is something like protecting "encapsulate" each conversation individually.
I do not know if I have explained myself well, in my opinion it is an additional layer of security, if a password is compromised, the other conversations are not compromised.