A block cipher can be easily broken if its encryption functions can be seen as linear maps on a small vector space. Even more so, if its round functions can be seen as linear maps on a small vector space. We show that this cannot happen for the AES. More precisely, we prove that if the AES round transformations can be embedded into a linear cipher acting on a vector space, then this space is huge-dimensional and so this embedding is infeasible in practice. We present two elementary proofs.
Titolo: | A note on an infeasible linearization of some block ciphers | |
Autori: | ||
Data di pubblicazione: | 2018 | |
Rivista: | ||
Handle: | http://hdl.handle.net/11697/123494 | |
Appare nelle tipologie: | 1.1 Articolo in rivista |
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