Last week’s installment on columnar transposition ciphers described a formula for the underlying permutation for a CTC. If we assume that the number of columns being used divides the length of the ...
We prove that the disjoint cycle decomposition of the permutation $(12 \cdot\cdot\cdot n_1)^{k_1} (12 \cdot\cdot\cdot n_2)^{k_2} \cdot\cdot\cdot (12 \cdot\cdot\cdot n_r)^{k_r}$ consists of cycles of ...
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