Merge pull request #68 from AM-ash-OR-AM-I/main

Added different Ciphers -  Cryptography

AM-ash-OR-AM-I/Ciphers - Python/cryptography.py

@@ -0,0 +1,53 @@
+"""
+Below is my custom implementation for cipher/deciphering messages
+"""
+import string
+
+all_characters = string.printable[:-6]
+
+
+class Encryption:
+    def encrypt(self, plain_text):
+        encrypted_str = ""
+        factor = len(plain_text)  # Length based key
+        for letter in plain_text:
+            for char in all_characters:
+                if letter == char:
+                    ordinal = ord(letter)
+                    encrypted_str += str(ordinal / factor) + "?"
+        return encrypted_str
+
+    def decrypt(self, encrypted_str):
+        en_key = ""
+        result = ""
+        length = 0
+        for i in encrypted_str:
+            if i == "?":
+                length += 1
+        for i in encrypted_str:
+            if i == "?":
+                ordinal = round(float(en_key) * length)
+                char = chr(ordinal)
+                result += char
+                en_key = ""
+            else:
+                en_key += i  # if not '?'
+        return result
+
+
+encryption = Encryption()
+
+ch = int(input(
+    """Enter your choice:
+1. Encrypt
+2. Decrypt
+"""
+))
+if ch == 1:
+    text = input("Enter the text to encrypt: ")
+    encrypted_text = encryption.encrypt(text)
+    print("Encrypted text =", encrypted_text)
+else:
+    encrypted_text = input("Enter text to decrypt: ")
+    plain_text = encryption.decrypt(encrypted_text)
+    print("Decrypted text =",plain_text)

AM-ash-OR-AM-I/Ciphers - Python/rot_cipher.py

@@ -0,0 +1,53 @@
+"""
+ROT Cipher a.k.a. Caeser Cipher.
+Shifts all of alphabets by n-places/shifts
+"""
+
+class ROT:
+    def __init__(self, shift=1) -> None:
+        self.shift = shift
+
+    def decrypt(self, encrypted_text: str):
+        cipher_text = ""
+        for x in encrypted_text:
+            starting_alphabet = 65 if x.isupper() else 97
+            position = ord(x) - starting_alphabet
+            cipher = (
+                chr(starting_alphabet + (position - self.shift) % 26)
+                if x.isalpha()
+                else x
+            )
+            cipher_text += cipher
+        return cipher_text
+
+    def encrypt(self, plain_text):
+        cipher_text = ""
+        for x in plain_text:
+            starting_alphabet = 65 if x.isupper() else 97
+            position = ord(x) - starting_alphabet
+            cipher = (
+                chr(starting_alphabet + (position + self.shift) % 26)
+                if x.isalpha()
+                else x
+            )
+            cipher_text += cipher
+        return cipher_text
+
+
+n = input(
+    """Enter your choice:
+1. Cipher
+2. Decipher/Plain Text
+"""
+)
+
+shift = int(input("Enter no. of shifts: "))
+caesar_cipher = ROT(shift)
+text = input("Text: ")
+
+if n == "2":
+    plain_text = caesar_cipher.decrypt(text)
+    print(f"Deciphered text = {plain_text}")
+else:
+    cipher_text = caesar_cipher.encrypt(text)
+    print(f"Cipher text = {cipher_text}")