Key mixing In our cipher. we break the 16-bit data block into four 4-bit sub-blocks each sub-block forms an input to a 4x4S-box(a substitution with 4 input and 4 output bits). we use a simple bit-Wise exclusive-or between the key bits In our cipher. we shall assume that all bits of the subkeys are independently generated and unrelated 2020 Key Mixing • In our cipher, we break the 16-bit data block into four 4-bit sub-blocks. Each sub-block forms an input to a 44 S-box (a substitution with 4 input and 4 output bits). we use a simple bit-wise exclusive-OR between the key bits. • In our cipher, we shall assume that all bits of the subkeys are independently generated and unrelated