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What is meant by vectors here? Just the inputs and outputs of the function. The function $f$ takes, as input, a sequence of bits (for example, 1010), and returns a sequence of bits (for example, 1100); the text refers to such a sequence of bits as a vector Can someone explain this? Consider a function f that is made up of two operations: Take ...


"Can a permutation/transposition cipher by itself apply diffusion?" Yes, it can. Look at a Pearson Hash. It's effectively a Merkle-Damgard construction operating on a block size of 8 bits. Bush has hit it on the head. Shannon's principle applies to large block sizes that cannot be operated upon by a single large substitution box. Pearson uses an 8 bit ...

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