Wonder if any one can help me. I am trying to set up an excel spread sheet to encrypt a vig using mod 26. I have been able to do the decrypt ie.
using data offset
=mod(data offset - data of vig,26)+1
but because the maths of encryption is more complex, all free info on the web fudges the issue. I haven't explained this very well, have I? but can any one understand what I am on about?