Qquestions that i can not understand!!!
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Qquestions that i can not understand!!!
in the BR ,why do we choose bits from s0,s2,s5,s7,s9,s11,s14,s15 other than others ???
what is the reason of this choice??
When we set values of LFSR states,why we choose D like:
d0=100010011010111
d1=010011010111100
d2=110001001101011
......
what if we choose other values?????
what is the reason of this choice??
When we set values of LFSR states,why we choose D like:
d0=100010011010111
d1=010011010111100
d2=110001001101011
......
what if we choose other values?????
Daystar Guest
Re: Qquestions that i can not understand!!!
Pls. refer to the criteria on the design of the bit reorganization below:
1. Suitable for software implementation;
2. The four 32bit words from the bit reorganization have good randomness in the statistical sense;
3. The number of the overlapping bits of four 32bit words at consecutive times is small.
As for the constant D, it is constructed by some msequences of length 15, see:
https://zucalg.forumotion.net/t32thesourcefortheconstantd
1. Suitable for software implementation;
2. The four 32bit words from the bit reorganization have good randomness in the statistical sense;
3. The number of the overlapping bits of four 32bit words at consecutive times is small.
As for the constant D, it is constructed by some msequences of length 15, see:
https://zucalg.forumotion.net/t32thesourcefortheconstantd
Xiutao Feng Posts : 13
Join date : 20100820
Re: Qquestions that i can not understand!!!
Of course, you can choose other values to the constant D. I believe that they have no essential effect to ZUC's security.
Daystar wrote:in the BR ,why do we choose bits from s0,s2,s5,s7,s9,s11,s14,s15 other than others ???
what is the reason of this choice??
When we set values of LFSR states,why we choose D like:
d0=100010011010111
d1=010011010111100
d2=110001001101011
......
what if we choose other values?????
Xiutao Feng Posts : 13
Join date : 20100820
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