Added implementation of Hill_cipher In python

Author: shivansh2310

algorithms/cryptography/Hill_cipher.py

@@ -0,0 +1,42 @@
+import numpy as np
+s=list(input("Enter a string"))
+c=[]
+for i in range(len(s)):
+ c.append(ord(s[i])-65)
+ 
+arr= np.array(c)
+
+a1=np.transpose(arr)
+print(a1)
+a1= a1.reshape(3,1)
+print(a1.shape)
+
+
+#key input
+print("Enter the key for the encryption")
+R = int(input("rows:")) 
+C = int(input("columns:")) 
+matrix = [] 
+print("Enter the key:") 
+
+for i in range(R):
+ a =[]
+ for j in range(C):
+ a.append(int(input()))
+ matrix.append(a)
+
+for i in range(R):
+ for j in range(C):
+ print(matrix[i][j], end = " ")
+matrix = np.array(matrix) 
+print(matrix.shape)
+print(matrix[1][1]) 
+
+mul=np.matmul(matrix,a1)
+mul = np.array(mul)
+print(mul.shape)
+print(mul)
+for i in range(R):
+ mul[i]=mul[i]%26
+
+print(mul)