From e743b42ab2405bfeb56b8ec242e480915262b7ca Mon Sep 17 00:00:00 2001
From: shivansh2310 <kashyapshivansh2310@gmail.com>
Date: Mon, 5 Oct 2020 20:39:06 +0530
Subject: [PATCH 1/2] Added implementation of Hill_cipher In python

---
 algorithms/cryptography/Hill_cipher.py | 42 ++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 algorithms/cryptography/Hill_cipher.py

diff --git a/algorithms/cryptography/Hill_cipher.py b/algorithms/cryptography/Hill_cipher.py
new file mode 100644
index 0000000..943c463
--- /dev/null
+++ b/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)

From dcbc0ea14a967941785d4e19a9b8962fbeee2920 Mon Sep 17 00:00:00 2001
From: shivansh kumar <42717219+shivansh2310@users.noreply.github.com>
Date: Thu, 22 Oct 2020 00:29:23 +0530
Subject: [PATCH 2/2] Railfence Cipher implementation in cipher

---
 algorithms/cryptography/railfence_cipher.py | 78 +++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 algorithms/cryptography/railfence_cipher.py

diff --git a/algorithms/cryptography/railfence_cipher.py b/algorithms/cryptography/railfence_cipher.py
new file mode 100644
index 0000000..0cdf24a
--- /dev/null
+++ b/algorithms/cryptography/railfence_cipher.py
@@ -0,0 +1,78 @@
+def railencrypt(st,k):
+    c = 0
+    x = 0
+    m =[[0] * (len(st)) for i in range(k)]
+    for r in range(len(st)):
+        m[c][r] = st[r]
+        if x == 0:
+            if c == (k-1):
+                x = 1
+                c -= 1
+            else:
+                c += 1
+        else:
+            if c == 0:
+                x = 0
+                c += 1
+            else:    
+                c -= 1
+           
+    result = [] 
+    for i in range(k): 
+        for j in range(len(st)): 
+            if m[i][j] != 0: 
+                    result.append(m[i][j]) 
+    print("CipherText:","" . join(result))       
+ 
+def raildecrypt(st,k):
+    c , x = 0 , 0
+    m =[[0] * (len(st)) for i in range(k)]
+    for r in range(len(st)):
+        m[c][r] = 1
+        if x == 0:
+            if c == (k-1):
+                x = 1
+                c -= 1
+            else:
+                c += 1
+        else:
+            if c == 0:
+                x = 0
+                c += 1
+            else:    
+                c -= 1
+    result = []
+    c , x = 0 , 0
+    for i in range(k): 
+        for j in range(len(st)): 
+            if m[i][j] == 1:
+                m[i][j] = st[x]
+                x += 1
+    for r in range(len(st)):
+        if m[c][r] != 0:
+            result.append(m[c][r])
+        if x == 0:
+            if c == (k-1):
+                x = 1
+                c -= 1
+            else:
+                c += 1
+        else:
+            if c == 0:
+                x = 0
+                c += 1
+            else:    
+                c -= 1
+    print("PlainText:","" . join(result))
+
+if __name__ == "__main__": 
+    string = input("Enter the Message:")
+    string = string.upper()
+    key = int(input("Enter the Key:"))
+    n = int(input("1.Encryption\n2.Decryption\nInput Your choice:"))
+    if(n == 1):
+        railencrypt(string,key)
+    elif(n == 2):
+        raildecrypt(string,key)
+    else:
+        print("Error")