Implementation of XSL attacks on block ciphers using dynamic S-Boxes

princeofmillerovo

2/4/24, 1:23 PM

For those who are not familiar with; XSL attacks basically focus on deriving a set of equations from the internal mechanics of a block cipher and then solving the same equations to recover the secret key.

Also a reason why Camellia is often seen equal to AES in terms of security despite using more rounds.

My question is:

Are block ciphers which utilize dynamic s-boxes such as Twofish immune to XSL attacks?

A) If yes why are they not used as the industry standard but rather AES?

B) If no considering AES and Serpent why there are not many documents/articles about XSL attacks on them?

0 + 1

s-boxes

aes

serpent

twofish

bk2204

2/4/24, 4:11 PM

XSL attacks are not currently considered to be practical, and whether they work at all is is the subject of some controversy. However, dynamic S-boxes tend to require table lookups, which are subject to timing attacks, which usually are practical.

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Implementation of XSL attacks on block ciphers using dynamic S-Boxes

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