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a guest Apr 25th, 2015 211 Never
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  1. assuming you have a commutative encryption operations (like XOR)  where  ((pt+E1)+E2)-E1 = (pt+E2)
  2.  
  3. then
  4.  
  5. person A                      person B
  6. OTP char a                    OTP char b
  7. message pt
  8. pt+a            ------->        pt+a
  9. pt+a+b          <--------       pt+a+b
  10. pt+a+b-a
  11. pt+b          -------->         pt+b
  12.                                 pt+b-b
  13.                                message pt
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