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ASAC — A Strong(er) ADFGVX Cipher — Part 5 Level 2
by Stefan Fendt, published on 7/9/2016
This series consists of 5 challenges based on each other. It introduces a new three-step cipher called ASAC, which is a modified version of ADFGVX. Part 5 is a "bonus" and just modifies the second challenge of this series by improving the second step of the cipher.