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It turns out that this is not very difficult to solve. It also looks like this is part of a public cryptography challenge, so rather than giving it all away, I'll just provide you with a couple of pointers. First take a look at this: There is a clear repeating pattern every 5 bytes. This suggests two things: (i) an XOR key with a length of 5 was used ...


This question as stated actually has a fairly interesting and unintuitive answer. Assuming an 8 byte 64 bit xor key and your test for printable ascii characters then after a megabyte of correct data your chances of having the right key are... about one in four billion. This is completely independent of how much data you have or verify, 1/2^32 is the maximum ...

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