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In order to answer this question, we need to understand the basis behind all of modern cryptography, which is computational hardness. Today, we believe that we know how to construct block ciphers that are secure, except for brute force search (or almost that secure). However, we don't really know this. We also think that factoring is hard, and so on. All of ...


We recently discussed this question with some colleagues and this is what we came up with (no guarantees): Grovers algorithm only outputs a correct answer if it is feed with a input set such that the target function evaluates as 1 for a single input and as 0 otherwise. The algorithm then iterates a subroutine $\sqrt{N}$ times (where $N$ is the size of the ...

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