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Wouldn't encrypting a message with AES, then encrypting the (randomly generated) AES key and IV with the EC public key suffice? Yes it would suffice and is what is usually done. However for this to work you'd have to have a way to reliably convert a random integer to a curve point and back which isn't trivially possible. And even if you could reliably ...


ECIES may seem complex, but if you try another approach, you would end up with something very much like it. If you only encrypt with AES, then you are not authenticating, which is most cases you also need to do. If you then encrypt and authenticate by yourself, you pretty much reinvented ECIES. But yes, ECIES is in higher layer of abstraction compared to ...

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