New answers tagged s-boxes
0
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Generalizing AES s-box circular shifts in bigger GF
There something misleading in Wikipedia article. They wrote:
$s = b \oplus (b <<< 1) \oplus (b <<< 2) \oplus (b <<< 3) \oplus (b <<< 4)$
Is equal to:
$s = b \times ...
- 795
2
votes
Generalizing AES s-box circular shifts in bigger GF
I calculated the matrix from the Wikipedia article and independently calculated the xor-rotation sequence from the matrix.
The matrix I calculated matches the Wikipedia article
...
- 21
2
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Accepted
Generalizing AES s-box circular shifts in bigger GF
OK the left vs right shift issue has to do with if the variable is represented by "big-endian" or "little-endian" convention, i.e., if the Least Significant Bit is on the left or ...
- 16.1k
0
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AES with other SBoxes
There is a nice tool, SBox Generator, which generates SBoxes and inverses from a given irreducible polynomial. GF($2^8$) has 30 so-called characteristic polynomials. Rijndael authors simply took the ...
- 127
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