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I want to implement a library to provide ECIES (Elliptical Curve Integrated Encryption Standard). We could see DH can be used as KA function for ECIES. I want to know specifically the ECDH (Elliptic Curve Diffie-Hellman) function can be used for KA (Key Agreement) functionality?

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Diffie-Hellman is a specific form of key agreement, and any key agreement can be used for IES. Of course ECIES normally uses ECDH - ECIES cannot use the normal DH scheme, as it doesn't use Elliptic Curves.

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