cipher tool python(1-3)
Wed Dec 21 2022 10:56:38 GMT+0000 (UTC)
def encrypt(message, key): cipher = "" for i in range(len(message)): char = message[i] keychar = key[i] if (char.isupper()): cipher += chr((ord(char) + ord(keychar) - 130) % 26 + 65) else: cipher += chr((ord(char) + ord(keychar) - 194) % 26 + 97) return cipher def decrypt(cipher, key): message = "" for i in range(len(cipher)): char = cipher[i] keychar = key[i] if (char.isupper()): message += chr((ord(char) - ord(keychar) - 130) % 26 + 65) else: message += chr((ord(char) - ord(keychar)) % 26 + 97) return message def newkey(text, key): newkey = "" length = 1 while length <= len(text): for i in range(len(key)): if length <= len(text): newkey += key[i] length += 1 else: break; return newkey x = 1 while(x==1): print("1.Caesar Cipher \n 2.Vernam Cipher \n 3.Vigenere Cipher \n 4.Transposition Cipher \n 5.RSA \n") Choice = int(input("Choose one of the options above: ")) if Choice == 1: print("\n1.Encrypt a message \n 2.Decrypt a message\n") option = int(input("Choose one option from above: ")) if option == 1: cipher = "" message = input("Enter your message: ") shift = int(input("Enter the shift value: ")) for i in range(len(message)): char = message[i] if (char.isupper()): cipher += chr((ord(char) + shift - 65) % 26 + 65) else: cipher += chr((ord(char) + shift - 97) % 26 + 97) print("Your cipher text = ",cipher) if option == 2: message = "" cipher = input("Enter your Cipher text: ") shift = int(input("Enter the shift value: ")) for i in range(len(cipher)): char = cipher[i] if (char.isupper()): message += chr((ord(char) - shift - 65) % 26 + 65) else: message += chr((ord(char) - shift - 97) % 26 + 97) print("Your decrypted message = ",message) elif Choice == 2: print("1.Encrypt a message") print("2.Decrypt a cipher") option = int(input("Choose one option from above: ")) if option == 1: message = input("Enter your message : ") key = input("Enter the key: ") print("Your cipher text = ",encrypt(message, key)) elif option == 2: cipher = input("Enter the cipher text: ") key = input("Enter the key: ") print("Your decrypted message = ",decrypt(cipher, key)) elif Choice == 3: print("1.Encrypt a message") print("2.Decrypt a cipher") option = int(input("Choose one option from above: ")) if option == 1: message = input("Enter your message: ") key = input("Enter the key: ") key = newkey(message, key) print("Your cipher text = ",encrypt(message,key)) elif option == 2: message = "" cipher = input("Enter the cipher text: ") key = input("Enter the key: ") key = newkey(cipher, key) print("Your decrypted message = ",decrypt(cipher,key)) opt = input("\nDo you want to continue?(y/n): ") if opt == 'n': x = 0 elif opt == 'y': x = 1
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