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ZIP 316: improve resolution and size of Feistel diagrams. 

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
This commit is contained in:
Daira Hopwood 2021-05-12 15:26:08 +01:00
parent 935b3ea767
commit f42dfd4260
2 changed files with 4 additions and 2 deletions
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4
zip-0316.html
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@ -337,7 +337,7 @@ c^{n+m}}{q}\)</span>
<span class="math">\(\mathsf{ceiling}(\ell_R/\ell_H)-1]\)</span>
.</p>
<figure class="align-center" align="center">
<img src="zip-0316-f4.png" />
<img width="372px" src="zip-0316-f4.png" />
<figcaption>Diagram of 4-round unkeyed Feistel construction</figcaption>
</figure>
<p>(In practice the lengths
@ -364,7 +364,7 @@ c^{n+m}}{q}\)</span>
<section id="heuristic-analysis"><h4><span class="section-heading">Heuristic analysis</span><span class="section-anchor"> <a rel="bookmark" href="#heuristic-analysis"><img width="24" height="24" src="assets/images/section-anchor.png" alt=""></a></span></h4>
<p>A 3-round unkeyed Feistel, as shown, is not sufficient:</p>
<figure class="align-center" align="center">
<img src="zip-0316-f3.png" />
<img width="372px" src="zip-0316-f3.png" />
<figcaption>Diagram of 3-round unkeyed Feistel construction</figcaption>
</figure>
<p>Suppose that an adversary has a target input/output pair

2
zip-0316.rst
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@ -477,6 +477,7 @@ concatenation of
:math:`\mathsf{ceiling}(\ell_R/\ell_H)-1]`.
.. figure:: zip-0316-f4.png
:width: 372px
:align: center
:figclass: align-center
@ -509,6 +510,7 @@ Heuristic analysis
A 3-round unkeyed Feistel, as shown, is not sufficient:
.. figure:: zip-0316-f3.png
:width: 372px
:align: center
:figclass: align-center