You see, I never gave her the solution key! This worked fairly well for my ego for a couple of weeks, until I learned from a friend that she had deciphered at least half of my invented alphabet, using letter frequency to figure them out it turned out that she liked puzzles of this sort. Mortified, I immediately stopped sending her any new notes, and so, alas, she never learned how the depths of my feelings for her. That junior high memory came back to me on Christmas Day, as I was reading through a book that my wife apparently, I did overcome my shyness at some point had given me as a gift.
In it, Mr. The book really struck a chord with me. However, in reading Mr. Belfield here involves both a key and an alphabet, and the encrypted letters result from a mathematical relation leveraging both of those. First thing I need to do is to create a grid with the alphabet offset by one each row or column :. The next letter in the keyword is I and the next letter in the sentence is R, and that yields Z. We ignore spaces, and when we run out of keyword letters, we just start again at the beginning of the keyword. According to Mr.
Belfield, this sort of code apparently was all but unbreakable for hundreds of years — nowadays, people have to change keywords at random times, throw in random junk in the text, or alter the alphabet ordering, to make it tougher to decode. Belfield writes about — for example, to make decoding trickier, I might make an alphabet that leverages an additional code word such as my last name:. The advantage is that not knowing the alphabet ordering makes it tougher for others to crack my code.
The other thing I immediately decided was that creating a 2-dimensional array to hold the offsets of the alphabet would be incredibly inelegant as well as wasteful of memory. Since the ordering of each row is deterministic, being offset by one each time, a simple index into the alphabet should suffice, wrapping around to the front of the alphabet when needed. Think of the alphabet as being a circular list if that helps visualize what I mean. The first two cases are easy to code:. If String. Return False. End If. If Key.
Return True. End Function. However, I also want to make sure that the Alphabet contains no duplicate characters, because that will make coding or decoding problematic. To check for duplicate characters in a string, people usually sort the string using a selection sort and then walk through it looking for multiples step-by-step. Transition Logo. Show More. Contact Us. Tell us about your project and get an estimate. Julia McClean. Elaine Tribley.
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