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Fill in holes in the documentation.

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I've filled in some text about prime generation methods and Ed448,
which were all the things marked as 'review before release'.

While I'm at it, also filled in a reasonable enough DSA key length
recommendation, because the FIXME comment in that section was within
sight of one of the places I was editing. FIPS 186-4 seemed to think
that RSA and DSA had comparable relationships between the key length
and practical security level, so I see no reason not to use the same
recommendation for both key types.
This commit is contained in:
Simon Tatham
2021-04-11 15:06:44 +01:00
parent 7153218b08
commit a21056acd2
3 changed files with 71 additions and 13 deletions
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doc/config.but
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@ -2422,8 +2422,9 @@ PuTTY currently supports the following host key types:
\b \q{\i{Ed25519}}: \I{EdDSA}Edwards-curve DSA using a twisted Edwards
curve with modulus \cw{2^255-19}.
\b \q{\i{Ed448}}: another \I{EdDSA}Edwards-curve DSA type.
\#{XXX-REVIEW-BEFORE-RELEASE: better description}
\b \q{\i{Ed448}}: another \I{EdDSA}Edwards-curve DSA type, using a
larger elliptic curve with a 448-bit instead of 255-bit modulus (so it
has a higher security level than Ed25519).
\b \q{ECDSA}: \i{elliptic curve} \i{DSA} using one of the
NIST-standardised elliptic curves.