These are just suggestions, you can implement it in any way you like, although if you only complete a few of the stages you can get partial credit.
Playfair cipher program code code#
I suggest you work on the problem in stages, testing that the code works before moving on to the next stage. The name/main stuff will cause that code to only be executed if you run the python file playfair.py directly. # Code to encode and return the ciphertext if _name_ = "_main_": That is, you must fill in the body of the following function: def playfair(key, plaintext): Your function must return the encrypted ciphertext. What you need to do.Ĭreate a file playfair.py which contains a function playfair which takes two parameters: one for the scret key and one for the plaintext. Since it is even, nothing needs to be added to the end. Now that all pairs are distinct, we check if the length is even or odd. The EE pair is the same so an X is inserted and the letters are rebroken into pairs HI DE TH EG OL DI NT HE TR EX ES TU MP Wikipedia has a visual example of encoding "Hide the gold in the tree stump." Notice how the initial breaking into pairs is HI DE TH EG OL DI NT HE TR EE ST UM P If a and b are not in the same row or same column, replace them with the letters on the same row respectively but on the other corners of the rectangle defined by the original pair.If a and b are on the same column, replace them with the letters below them, wrapping around if needed.If a and b are on the same row, replace them with letters to their right, wrapping around if needed.Now that all pairs are distinct letters, for each pair (a,b) do the following.If the length is odd and does end with a Z, add a Q on the end. If the length is odd and does not end with a Z, add a Z at the end.If both letters in a pair are the same and they are X, insert a Q between them and rebreak into pairs. Starting from the left, if both letters in a pair are the same and they are not X, insert an X between them and rebreak into pairs. Break the input into blocks of two letters.
Given a secret word, create a 5 by 5 grid of the 25 capital letters A-Z with J omitted. The rules are listed on Wikipedia, but here they are again with the specific choices we will use.
A description of the cipher and a good visual walkthrough is available on Wikipedia.ĭue date is Friday October 30. The copy-paste of the page "PlayFair Cipher" or any of its results, is allowed as long as you cite dCode!Ĭite as source (bibliography): PlayFair Cipher on dCode.Project 1 is to implement the encoding and decoding of the Playfair cipher.
Playfair cipher program code android#
Except explicit open source licence (indicated Creative Commons / free), the "PlayFair Cipher" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or the "PlayFair Cipher" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, or API access for "PlayFair Cipher" are not public, same for offline use on PC, mobile, tablet, iPhone or Android app! Ask a new question Source codeĭCode retains ownership of the "PlayFair Cipher" source code. 1854 by Charles Wheatstone, after the name of one of his friends Lord Playfair.
0 kommentar(er)
