10 questions linked to/from Desirable S-box properties
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### What are the standard properties of an S-Box [duplicate]

Apart form the following, what are the other properties of a good cryptographic Substitution box or the S-Box: Changing one input bit should change about half of the output bits. Each output bit ...
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### Is the following s-box more linear or more non-linear?

I am trying to figure out whether the following simple s-box configuration I created is more linear than non-linear or vice versa more non-linear than linear? The parameters for this 16*4 table of ...
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### Is this an example of a Feistel cipher?

Have tried to create simplest example. A,B,C,D are 32-bit unsigned, as is k[4]. P is an expansion type p-box of 256 "random" 32-bit values. Assume key-whitening and multiple rounds/keys ...
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### Blowfish, Sboxes and the digits of PI, and the P_Array

I am trying to use the Blowfish algorithm, however, I am trying to understand SBoxes that were used in the algorithm. I saw that it uses the hex digits of PI. I looked around in the web and found some ...