[http-auth] CFRG Curves in Mutual
Ilari Liusvaara <ilariliusvaara@welho.com> Sat, 14 November 2015 13:32 UTC
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Date: Sat, 14 Nov 2015 15:31:59 +0200
From: Ilari Liusvaara <ilariliusvaara@welho.com>
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Subject: [http-auth] CFRG Curves in Mutual
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Should CFRG curves (Edwards25519 and Edwards448) be added to Mutual spec? The curves (but no point formats) are defined by CFRG-CURVES, which has been sent to the RFC Editor (currently being copyedited). The existing point format in the Mutual draft is rather bad[1] (especially for these curves), but as far as I can tell, it is not mathematically unworkable. (The point decoding may also divide by zero. Fortunately all the points where this happens are of order 4 and as such invalid anyway). [1] Putting the y sign bit at LSB position makes one chainshift the entiere thing. And for Edwards curves, usually y is written in full and x is compressed to one bit, not the vice versa that is usually done with Weierstrass curves. -Ilari
- [http-auth] CFRG Curves in Mutual Ilari Liusvaara
- Re: [http-auth] CFRG Curves in Mutual 大岩寛