Can someone please tell me what this symmetric key is for. I'm thinking the cipher suite will still compute a shared secret because it still needs a public key for decryption from the sender, but I'm bit nervous about sharing a public key and a symmetric key. Can anyone please help me understand what's going on here. It seems like sharing two directives of a symmetric key would only make it less secure and easier to compute. Is it safe to pass this symmetric key back and forth?
What's the deal with encapsulatedKey? In Apple's HPKE.Ciphersuite.P521_SHA512_AES_GCM_256 Is this sensitive data?
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