restructuring repo

Author: SANKET7738

Cesar_Cipher/Readme.md

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+# Caesar Cipher- Cryptography with Python
+
+## Overview:
+
+Caesar Cipher is one of most easiest and simplest encryption methods. It is a stype of substitution cipher.
+It works by shifting each character of the input string by a given value down the alphabetical order.
+
+Example: Upon giving a shift key of 2, A would be replaced by C, B by D and so on.
+
+<p align = "center">
+	<img src="caesar_cipher.jpg" alt="caesar_cipher">
+</p>
+
+## Output:
+
+<p align = "left">
+	<img src="output.jpg" alt="output">
+</p>

Cesar_Cipher/caesar_ciper.py

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+''' A python program that implements Caesar Cipher Technique- Cryptography'''
+
+def encryption(string,key): #function definition
+    ''' Function that encrypts the given string using caesar cipher technique
+        Params: string, key
+        Returns: encrypted_text
+    '''
+    encrypted_text=''
+    for char in string:
+        if char=='': 
+            encrypted_text+=char
+            #Encrypts Empty character
+
+        elif char.isupper(): 
+            encrypted_text= encrypted_text+ chr((ord(char) + key-65) % 26 + 65) 
+            #Encrypts Upper case character
+         
+        else:
+            encrypted_text=encrypted_text+ chr((ord(char) + key-97) % 26 + 97)
+            #Encrypts lower case character
+    
+    return encrypted_text
+
+if __name__== "__main__":
+    string=input('Enter the text to be encrypted:')
+    key=int(input('Enter the shift key:'))
+    print('Text before Encryption:',string)
+    print('Shift Key:',key)
+    print('Encrypted text:',encryption(string,key)) #function calling
+
+'''
+Sample Output:
+Enter the text to be encrypted:Alphabets ABCD
+Enter the shift key:4
+Text before Encryption: Alphabets ABCD
+Shift Key: 4
+Encrypted text: EptlefixwrEFGH
+
+'''
+

Cesar_Cipher/caesar_cipher.jpg

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+import sys 
+import hashlib
+
+methods = {
+  '1':'md5',
+  '2':'sha1',
+  '3':'sha256',
+  '4':'sha512',
+}
+
+def help():
+  print("Usage: python app.py filename")
+  print("""
+  Available hash methods
+  [1] MD5
+  [2] SHA1
+  [3] SHA256
+  [4] SHA512
+  """)
+
+
+def file_read(filename):
+  try:      
+    content = open(filename, "r").read()
+    content = content.encode('utf-8')
+    return content
+  except:
+    print("Openning file error")
+    exit(0)
+
+def hash_text(content,method):
+  return hashlib.new(methods[method],content).hexdigest()
+
+
+def write_content(hashed_content):
+  new_file=open('Hased data.txt','w')
+  new_file.write(hashed_content)
+  new_file.close()
+  print("Done writing data to file hash data.txt")
+
+if __name__ == "__main__":
+    help()
+    if len(sys.argv) < 2:
+      help()
+      print("No file specified")
+      exit(0)
+    
+    filename = sys.argv[1]
+
+    content = file_read(filename)
+    method=int(input())
+    if(method > 4 or method < 1):
+        print("No method or wrong method specified. Using default md5 hashing method")
+        method = 1
+
+    hashed_content = hash_text(content,str(method))
+
+    write_content(hashed_content)