I understand what is happening and how the endpoint is computed but I'm still a bit unsure of where "SP" (Staring Point) came from. Are the starting points, randomly selected keys from the key-space n?
for example...
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1$\begingroup$ What reference are you pulling this terminology from? That context would be helpful. $\endgroup$– mikeazoApr 11, 2016 at 14:47
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$\begingroup$ Sorry, I've included an example image. Alot of images that I find start with either S or SP for starting point. I'm just trying to figure out exactly what this is. $\endgroup$– ellefcApr 11, 2016 at 15:04
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1 Answer
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Given the diagram, yes they are randomly selected keys, $P$ is a fixed plaintext and the projection of the output to the keyspace gives you the next input as key to the cipher, thus creating a pseudorandom walk through the keyspace.
