Anna-Marie With Her Shotgun -- Part Four -- Anna-Marie -- Anna The Codebreaker

These days I'm learning different forms of code making and breaking. Cryptography has been around for years. The Caesar cipher shifted letters in shifts of three spaces, and is generally considered to be weaker than than even other basic substitutions.

Currently, I've been working on having a different mixed alphabet key per single character or digit, and having a different reciprocal quality: the reciprocal nature of one alphabetic row may only be this way for one letter, but not the other. But when shifting it using a different mixed alphabet, this solves the double encryption problem that comes standard in Rotation Thirteen Shift. Normally in a rote thirteen shift, simply encrypting it again flips it back to the original plain text. This is where the mixed alphabet comes in. Suppose there was an alphabetic shift based on my name:

 

A N M R I E B O G L C D F H J K P Q S T U V W X Y Z

H J K P Q S T U V W X Y Z A N M R I E B O G L C D F

 

The effect will only work on an individual letter basis, but if one had thousands of different mixed alphabetic shifts, one could theoretically assign a different reciprocal shift. And in some cases, if you also did a Two Square equivalent of having a different reciprocal quality per letter, you can drastically increase the security of a reciprocal cipher. You would have to have the specific two mixed alphabets by letter couplets. Generally you will want your plain text to be as short as possible to reduce the likelihood of double letters. And simply pad out the plain-text with letters that did not occur previously in the text, lining it up carefully in rows of five letters, then doing one final shift of a block transposition. And you end up with cipher text that doesn't repeat any letter, and beats all attempts at frequency analyses, but it can still be brute forced with time and effort, or if perhaps one may know the key.

All this to say, I've had considerable time to do more things with my life than crocheting and having soup boil in the kitchen. And having the husband find a cobbler to carve my grand children new wooden clogs.

I wonder if he'd put ciphers on them.

Maybe not.

posted by JustSarah @ 22nd Sep 2018, 6:15 PM