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There are many advantages to Curve25519, but in many cases you need to use RSA. E.g., when you're trying to talk to arbitrary websites securely, you don't get to choose what was used to sign their certificate. There are many circumstances where you have to build systems that work with other systems, and ignoring that doesn't make it go away.

I think the key advice is to use an existing crypto library. A non-expert who tries to implement ECC themselves will almost certainly screw it up as well. Sure, it is a little less likely, but it is still possible.




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