while nip17 isn't as secure as signal in the cryptographic sense, it does have a nuanced advantage of being able to send to personal inbox relays where only you have access to the encrypted material.

its up to you if you consider this more or less secure...

if there's nothing for an adversary to decrypt, does forward secrecy gain you anything?

as long as we're not blasting giftwraps to public relays then it should be pretty secure.

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