Let's say a device has 2 private keys and service has the 2 corresponding public keys. Is there an efficient way to encrypt a symmetric key from the service side utilizing the 2 public keys, such that on the client, it requires both private keys in order to decrypt? I.e if I only have private key...

I'm not familiar with ECC, sorry if this question is a bit weird/stupid. I'm implementing some protocol using some 3rd party repository (Private Join and Compute), and the repo only supports built-in curves in FIPS modules (P-224, 256, 348 and 512) in openssl when creating EC group: StatusOr<ECGr...