This new cipher is called the Trifid Cipher. The Bifid Cipher can be taken into three dimensions to slightly increase the security of the message. The digit in the top row and the digit in the bottom row will together reference the decoded letter in the Polybius Square. To decrypt the message, the player will need to use the table. Modifying the package.json file with new scripts. How to Solve When solving the Polybius Square Cipher, the player is given an encrypted message and a table. The following skills were utilized: Installing packages via NPM. I have made a program that currently encrypts a string of characters using the array polybiusSquare. Each character depends on two plaintext characters, so it is a digraphic cipher. HTML and CSS was supplied with starter code. 1 I'm new to stackoverflow as well as Java programming. The Bifid cipher uses a Polybius square to achieve the fractionation. Now, divide the long string of numbers into two equal rows. Summary This project was designed to test the ability to build tricky algorithms in JavaScript as well as write unit tests with Mocha & Chai. To decipher a Bifid encrypted message, you first convert each letter into its corresponding number via the Polybius Square. This means that if part of the ciphertext is discovered by a third party, it is unlikely that they will be able to crack it. Since the first letter in the plaintext is encoded into the first and middle letters of the ciphertext, the recipient of the message must have the entire message before they can decode it. The Polybius Square is used again to convert the numbers back into letters which gives us our ciphertext: qddltbcxkrxlk The numbers are now read off horizontally and grouped into pairs.
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