From 6f526d20fc784ad444e576d17ec0eb3dce74e158 Mon Sep 17 00:00:00 2001
From: shivansh kumar <42717219+shivansh2310@users.noreply.github.com>
Date: Sat, 5 Oct 2019 01:42:22 +0530
Subject: [PATCH 1/2] Binary Converter

---
 Binary-hex-octal-converter.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 Binary-hex-octal-converter.c

diff --git a/Binary-hex-octal-converter.c b/Binary-hex-octal-converter.c
new file mode 100644
index 0000000..0611fd2
--- /dev/null
+++ b/Binary-hex-octal-converter.c
@@ -0,0 +1,34 @@
+#include<stdio.h>
+void convert(int, int);
+ 
+int main()
+{
+	int num;
+	printf("Enter a positive decimal number : ");
+	scanf("%d", &num);
+	printf("\nBinary number :: ");
+	convert(num, 2);
+	printf("\n");
+	printf("\nOctal number :: ");
+	convert(num, 8);
+	printf("\n");
+	printf("\nHexadecimal number :: ");
+	convert(num, 16);
+	printf("\n");
+ 
+	return 0;
+}
+ 
+void convert (int num, int base)
+{
+	int rem = num%base;
+ 
+	if(num==0)
+		return;
+	convert(num/base, base);
+ 
+	if(rem < 10)
+		printf("%d", rem);
+	else
+		printf("%c", rem-10+'A' );
+}
\ No newline at end of file

From 2a813cd5dda22ea7c999de966152a6c1bb7de684 Mon Sep 17 00:00:00 2001
From: shivansh2310 <kashyapshivansh2310@gmail.com>
Date: Mon, 5 Oct 2020 20:10:04 +0530
Subject: [PATCH 2/2]  Hill Cipher implementation in python

---
 Crypto/hill_cipher.py | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 Crypto/hill_cipher.py

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