Qbasic/QuickBasic Programming

My Extended Reciprocal Table is a modified form of a Vigenère Polygraphic Square Table that was invented by Blaise de Vigenère and used extensively in the very early days of paper and pencil cryptology. However the way he suggested its use with an autokey approach has been ignored and instead it has been used by placing a repeating key over the plain text. This makes it much less secure and easier to crack. The autokey approach is that the plain text serves as both the key AND the encrypted results. [NOTE: A PDF of my Extended Reciprocal Table is located in the zip file here: https://qb45.org/files.php?action=showfile&id=1929] The attached zip file contains the Windows executable, the source code and a PDF with screen shots that fully explain how the autokey works.

Source included - QB64 - 780.56 KB - 659 downloads

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