CRYPTO NEWS

Jesse Powell to Step Down as Kraken CEO


Jesse Powell will remain as executive chairman of the crypto exchange, focusing his time on product development and crypto industry advocacy. (Read More)

How can an S-Box be reversed?

So, as an exercise to greater understand some things about cryptography, I decided to try and implement GOST 28147-89, which uses eight 4×4 S-Boxes. I can grasp the concept of putting 4 bits through the S-Box and getting four out, but how would one reverse this? Furthermore, how would one reverse uneven S-Boxes, such as::Listen

So, as an exercise to greater understand some things about cryptography, I decided to try and implement GOST 28147-89, which uses eight 4×4 S-Boxes. I can grasp the concept of putting 4 bits through the S-Box and getting four out, but how would one reverse this?

Furthermore, how would one reverse uneven S-Boxes, such as DES’s 6×4 S-Box, when multiple inputs give the same output (e.g., for DES’s S-Box S5, where inputs of 100011, 101110, 011101, and 010000 all give an output of 1000).

Jesse Powell to Step Down as Kraken CEO

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