Update playfire.ipynb

Author: BBEK-Anand

cryptography/playfire.ipynb

@@ -33,31 +33,42 @@
    "source": [
     "class PlayFire:\n",
     "    \"\"\"\n",
-    "    PlayFire class implements the Playfair cipher for encryption and decryption of messages.\n",
+    "    PlayFire class implements the Playfair \n",
+    "    cipher for encryption and decryption of messages.\n",
     "\n",
-    "    The Playfair cipher is a digraph substitution cipher that encrypts pairs of letters. It requires a key, which\n",
-    "    is used to create a 6x6 matrix of letters and digits, and processes the message in pairs.\n",
+    "    The Playfair cipher is a digraph substitution \n",
+    "    cipher that encrypts pairs of letters. It requires a key, which\n",
+    "    is used to create a 6x6 matrix of letters and \n",
+    "    digits, and processes the message in pairs.\n",
     "\n",
     "    Attributes:\n",
     "    key (str): The key used to generate the matrix.\n",
-    "    key_matrix (list): The 6x6 matrix used for encryption and decryption.\n",
-    "    extra (str): The extra character used to pad the message if the length is odd (default is 'x').\n",
+    "    key_matrix (list): The 6x6 matrix used for \n",
+    "    encryption and decryption.extra (str): The extra character \n",
+    "    used to pad the message if the length is odd (default is 'x').\n",
     "\n",
     "    Methods:\n",
-    "    __verify_key(key): Verifies that the key is valid (contains unique characters).\n",
-    "    __make_matrix(): Creates a 6x6 matrix using the key and the remaining letters/digits.\n",
-    "    find_idx(pair): Finds the positions (row and column indices) of the pair of characters in the matrix.\n",
-    "    encrypt(msg): Encrypts the given message using the Playfair cipher.\n",
-    "    decrypt(msg): Decrypts the given encrypted message using the Playfair cipher.\n",
+    "    __verify_key(key): Verifies that the key is \n",
+    "        valid (contains unique characters).\n",
+    "    __make_matrix(): Creates a 6x6 matrix using \n",
+    "        the key and the remaining letters/digits.\n",
+    "    find_idx(pair): Finds the positions (row and column indices) \n",
+    "        of the pair of characters in the matrix.\n",
+    "    encrypt(msg): Encrypts the given message using \n",
+    "        the Playfair cipher.\n",
+    "    decrypt(msg): Decrypts the given encrypted \n",
+    "        message using the Playfair cipher.\n",
     "    \"\"\"\n",
     "\n",
     "    def __init__(self, key, extra=\"x\"):\n",
     "        \"\"\"\n",
-    "        Initializes the PlayFire cipher with a key and an optional extra character for padding.\n",
+    "        Initializes the PlayFire cipher with a key and \n",
+    "            an optional extra character for padding.\n",
     "\n",
     "        Parameters:\n",
     "        key (str): The key to generate the cipher matrix.\n",
-    "        extra (str, optional): The character used for padding the message if its length is odd. Defaults to 'x'.\n",
+    "        extra (str, optional): The character used for \n",
+    "            padding the message if its length is odd. Defaults to 'x'.\n",
     "        \"\"\"\n",
     "        self.key = self.__verify_key(key)\n",
     "        self.key_matrix = self.__make_matrix()\n",
@@ -71,7 +82,8 @@
     "        key (str): The key to verify.\n",
     "\n",
     "        Returns:\n",
-    "        str: The valid key if it contains only unique characters, else prints an error.\n",
+    "        str: The valid key if it contains only unique \n",
+    "            characters, else prints an error.\n",
     "        \"\"\"\n",
     "        keyy = []\n",
     "        for i in key:\n",
@@ -84,7 +96,8 @@
     "\n",
     "    def __make_matrix(self):\n",
     "        \"\"\"\n",
-    "        Creates a 6x6 matrix from the key by filling in remaining characters of the alphabet and digits.\n",
+    "        Creates a 6x6 matrix from the key by filling \n",
+    "            in remaining characters of the alphabet and digits.\n",
     "\n",
     "        Returns:\n",
     "        list: A 6x6 matrix for encryption and decryption.\n",
@@ -102,13 +115,16 @@
     "\n",
     "    def find_idx(self, pair):\n",
     "        \"\"\"\n",
-    "        Finds the row and column indices of the characters in the matrix.\n",
+    "        Finds the row and column indices of the \n",
+    "            characters in the matrix.\n",
     "\n",
     "        Parameters:\n",
-    "        pair (list): A pair of characters whose positions are to be found in the matrix.\n",
+    "        pair (list): A pair of characters whose \n",
+    "            positions are to be found in the matrix.\n",
     "\n",
     "        Returns:\n",
-    "        list: A list containing the row and column indices of both characters in the matrix.\n",
+    "        list: A list containing the row and column \n",
+    "            indices of both characters in the matrix.\n",
     "        \"\"\"\n",
     "        idxs = [6, 6]\n",
     "        for i in range(6):\n",