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+To: Henri Sivonen <hsivonen@hsivonen.fi>
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+From: Wladimir Palant <gtiobnam@palant.de>
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+Subject: Re: [rfc] Passphrase-based encryption
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+
+On 03.07.2017 20:29, Henri Sivonen wrote:
+> If you don't need AES specifically, you can find an XSalsa20+Poly1305
+> implementation at:
+> https://github.com/hsivonen/obnam/compare/salsa?expand=1
+
+Interesting, thank you for sharing. This is way more advanced than my
+quick and dirty plugin of course.
+
+> I haven't had the time to write proper unit tests, benchmarks or docs,
+> which is why I haven't tried upstreaming it.
+
+Unfortunately, I assume that the arguments against upstreaming my
+solution apply to yours just as well - so even with tests, benchmarks
+and docs it won't get accepted.
+
+> Probably more important that letting users tweak the key size is to
+> make sure that the AEAD construction is good and suitable for use with
+> a randomly-generated nonce for the amount of data one would expect to
+> encrypt using Obnam. I don't know if CFB fits this, but
+> XSalsa20+Poly1305 or XChaCha20+Poly1305 should (the non-X variants of
+> Salsa20 and ChaCha20 *don't*).
+
+CFB uses initialization vectors (randomly generated for each file in my
+case) which I think serve a similar purpose. But I'm not really familiar
+with either Salsa20 or ChaCha20 so I would be grateful if you could
+expand. What kind of issues is this about? Are you implying that these
+algorithms would be better performance-wise? I don't really know how
+they compare to AES but at least for me the performance is clearly
+limited by the uplink and not by the CPU. In other scenarios it could be
+completely different of course.
+
+regards
+Wladimir
+
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