The argument of SHA-512/256 makes NO SENSE. If you know about that, then just use HMAC.
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that sounds fair
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For the usage as a MAC, we had some numbers here comparing truncation and HMAC: https://eprint.iacr.org/2016/142.pdf (Appendix A)
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New conversation -
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Just use CRC32
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Son. of a. Let's just send people private keys while we keep the public keys. wtf.
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This is not a bad idea. A rsa pubkey is pretty small. This way you optimize your space
End of conversation
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