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Author: PurpleVen

playfair_cipher.py

@@ -0,0 +1,86 @@
+from collections import OrderedDict
+
+
+def Generate_Pairs():
+    i = 0
+    while i != len(plainText_lis):
+        if (i == (len(plainText_lis) - (len(plainText_lis) % 2)) and len(plainText_lis) % 2 != 0):
+            plainText_lis.append('x')
+            break
+        if (plainText_lis[i] == plainText_lis[i + 1]):
+            plainText_lis.insert(i + 1, 'x')
+        i += 2
+
+    Key_Matrix()
+
+
+def Key_Matrix():
+    key_lis_tmp.extend(key_dup)
+
+    var = 0
+
+    while len(key_lis_tmp) != 25:
+        value = chr(97 + var)
+        if value not in key_lis_tmp:
+            if value != 'j':
+                key_lis_tmp.append(value)
+        var += 1
+
+    for i in range(0, len(key_lis_tmp), 5):
+        matrix_pf.append(key_lis_tmp[i:i + 5])
+
+    print("\nMatrix: ")
+    for i in matrix_pf:
+        print(i, end="\n")
+
+    Playfair_Cypher_Algo()
+
+
+def Fetch_Inde(valu_fn):
+    for index_one_fe, i in enumerate(matrix_pf):
+        for index_two_fe, j in enumerate(i):
+            if j == valu_fn:
+                return (index_one_fe, index_two_fe)
+
+
+def Playfair_Cypher_Algo():
+    for i in range(0, len(plainText_lis) - 1, 2):
+        index_one_pf, index_two_pf = Fetch_Inde(plainText_lis[i])
+        index_three_pf, index_four_pf = Fetch_Inde(plainText_lis[i + 1])
+
+        if (index_one_pf == index_three_pf):
+            index_two_pf = (index_two_pf + 1) % 5
+            index_four_pf = (index_four_pf + 1) % 5
+            cipherText.extend(matrix_pf[index_one_pf][index_two_pf])
+            cipherText.extend(matrix_pf[index_three_pf][index_four_pf])
+
+        elif (index_two_pf == index_four_pf):
+            index_one_pf = (index_one_pf + 1) % 5
+            index_three_pf = (index_three_pf + 1) % 5
+            cipherText.extend(matrix_pf[index_one_pf][index_two_pf])
+            cipherText.extend(matrix_pf[index_three_pf][index_four_pf])
+
+        else:
+            cipherText.extend(matrix_pf[index_one_pf][index_four_pf])
+            cipherText.extend(matrix_pf[index_three_pf][index_two_pf])
+
+    print("\nCipher Text: ", "".join(cipherText))
+
+
+plainText = input("\nEnter Plain Text: ")
+key = input("Enter Key: ")
+
+plainText = plainText.replace(" ", "").lower()
+plainText = plainText.replace("j", "i")
+key = key.replace(" ", "").lower()
+key = key.replace("j", "i")
+
+key_dup = "".join(OrderedDict.fromkeys(key))
+
+plainText_lis = list(plainText)
+matrix_pf = []
+key_lis_tmp = []
+cipherText = []
+
+Generate_Pairs()
+Generate_Pairs()