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If you want to incorporate random S-boxes, refer to the design of Twofish Algorithm which uses key-dependent S-boxes for encryption.


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The question is contradicting with the title. A random S-Box with a "very good diffusion mechanism" would be perfectly ok, assuming enough rounds. A random S-Box without a "very good diffusion mechanism" would be worse. For example, consider the AES with the S-Box replaced by a random S-Box. We can use known bounds on the number of active ...


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