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Results tagged with s-boxes
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user 44603
(or substitution boxes), components in many block ciphers used to substitute parts of the data in a non-linear way. While often fixed by the algorithm (like in DES and AES), sometimes they are key-dependent (like in Blowfish).
7
votes
1
answer
338
views
AES s-box representation
I have seen in various papers like in this one page 4, that the AES s-box equation is:
$S=A \circ φ^{-1}(φ(x)^{254})$ where $φ$ is the isomorphism from $\mathbb{F}_2^{8}$ to $\mathbb{F}_{2^{8}}$ with …
- 391
3
votes
1
answer
308
views
Are non bijective sboxes weaker (on feistel networks)?
I have heard it anecdotically that non-bijective sboxes are potentially weaker to be used in designs like feistel networks. (since by design, it is allowed for the sbox to be non-reversible)
Is that …
- 391
3
votes
0
answers
73
views
Does this approach on MEDP take into account the multiple differential trails?
I was reading this (chapter 3.1) paper, and the author proposed this method to calculate the MEDP on 2-round AES:
I cannot fully understand what he is doing but it seems like it iterating over all …
- 391