How do you calculate Pairwise XOR?

Question

How is pairwise XOR calculated ? I googled but could not find anything relevant.

EDIT : How is it different from normal XOR?

score 2 · Accepted Answer · answered Sep 16 '14 at 00:33

2

Each bit of the number are pairwise XOR'd with each other. For example:

  15 = 0000 1111
  21 = 0001 0101

So, the XOR is

       0001 1010 = 26

answered Sep 16 '14 at 00:33

BadZen

How is this different from normal XOR? – Nitish Upreti Sep 16 '14 at 00:35
2

I'm not sure what you mean by "pairwise". There's not a standard, different XOR function called "pairwise XOR" - it probably just refers to the fact that you're repeating XOR calculation among two collated sets/arrays. If this is for a class however, all bets are off - if the prof defined "pairwise XOR", you've got to know what the definition is... – BadZen Sep 16 '14 at 00:39
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Was going through this paper and stumbled onto it : http://lanterns.eecs.utk.edu/publications/kBF_infocom.pdf – Nitish Upreti Sep 16 '14 at 00:40
Ah. "pairwise" there just refers to the fact that each char of the strings in question are XOR'd with the corresponding chars in the other, paired string. So, str_a[0] with str_b[0], str_a[1] with str_b[1], etc... – BadZen Sep 16 '14 at 00:43
Oddly enough, I was looking for a similar paper on this exact stuff but had forgotten the name of it. So, thanks! *lucky!* =) – BadZen Sep 16 '14 at 00:45

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