AES with linear S-Box
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If the AES S-Box is replaced with a linear or affine transformation, for instance the identity mapping $sigma(x)=x$, does the cipher become entirely affine and hence trivially weak?
aes s-boxes affine-cipher
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up vote
2
down vote
favorite
If the AES S-Box is replaced with a linear or affine transformation, for instance the identity mapping $sigma(x)=x$, does the cipher become entirely affine and hence trivially weak?
aes s-boxes affine-cipher
add a comment |Â
up vote
2
down vote
favorite
up vote
2
down vote
favorite
If the AES S-Box is replaced with a linear or affine transformation, for instance the identity mapping $sigma(x)=x$, does the cipher become entirely affine and hence trivially weak?
aes s-boxes affine-cipher
If the AES S-Box is replaced with a linear or affine transformation, for instance the identity mapping $sigma(x)=x$, does the cipher become entirely affine and hence trivially weak?
aes s-boxes affine-cipher
asked Aug 10 at 11:47
conchild
397313
397313
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1 Answer
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votes
up vote
6
down vote
accepted
does the cipher become entirely affine and hence trivially weak?
Yes; the AES sbox is the only source of nonlinearity (the ShiftRows and MixColumns are linear, and AddRoundKeys for a fixed key is affine), and so if you replace it with a linear/affine one, the entire cipher becomes affine.
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
6
down vote
accepted
does the cipher become entirely affine and hence trivially weak?
Yes; the AES sbox is the only source of nonlinearity (the ShiftRows and MixColumns are linear, and AddRoundKeys for a fixed key is affine), and so if you replace it with a linear/affine one, the entire cipher becomes affine.
add a comment |Â
up vote
6
down vote
accepted
does the cipher become entirely affine and hence trivially weak?
Yes; the AES sbox is the only source of nonlinearity (the ShiftRows and MixColumns are linear, and AddRoundKeys for a fixed key is affine), and so if you replace it with a linear/affine one, the entire cipher becomes affine.
add a comment |Â
up vote
6
down vote
accepted
up vote
6
down vote
accepted
does the cipher become entirely affine and hence trivially weak?
Yes; the AES sbox is the only source of nonlinearity (the ShiftRows and MixColumns are linear, and AddRoundKeys for a fixed key is affine), and so if you replace it with a linear/affine one, the entire cipher becomes affine.
does the cipher become entirely affine and hence trivially weak?
Yes; the AES sbox is the only source of nonlinearity (the ShiftRows and MixColumns are linear, and AddRoundKeys for a fixed key is affine), and so if you replace it with a linear/affine one, the entire cipher becomes affine.
answered Aug 10 at 14:54
poncho
84.8k2127214
84.8k2127214
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