Введение в шифрование данных с Python

# Printing a "Hello World!"
print("Hello world!")

# Declaration of strings is shown below:
variable_name_string = "Variable content string"
print(variable_name_string)

# He lists of python can be declared as compound data types, separated by commas and enclosed within square brackets ([]).
list = [ 'abcd', 786 , 2.23, 'rocky', 70.2 ]
tinylist = [123, 'rocky']
print(list[0])
print(tinylist)

# Python dictionary is a type of hash table. A dictionary key can be almost any data type of Python, which are usually numbers or strings.
thisdict = {
  "brand": "Ford",
  "model": "Mustang",
  "year": 1964
}
print(thisdict)
print(thisdict["model"]) # Note the difference

# Printing the values
for x in thisdict:
  print(x)

# Printing the keys
for x in thisdict:
  print(thisdict[x])

# Printing keys + values
for x, y in thisdict.items():
  print(x, y) 

# adding a key and its value
thisdict["color"] = "red"
print(thisdict)

# removing the first item (here it's brand)
thisdict.popitem()
print(thisdict)

# The del keyword removes the item with the specified key name
del thisdict["model"]
print(thisdict)

message = 'This is program to explain reverse cipher.'
translated = '' #cipher text is stored in this variable
i = len(message) - 1

while i >= 0:
   translated = translated + message[i]
   i = i - 1
print("The cipher text is : ", translated)

#A python program to illustrate Caesar Cipher Technique 
def encrypt(text,s): 
    result = "" 

    # traverse text 
    for i in range(len(text)): 
        char = text[i] 

        # Encrypt uppercase characters 
        if (char.isupper()): 
            result += chr((ord(char) + s-65) % 26 + 65) 

        # Encrypt lowercase characters 
        else: 
            result += chr((ord(char) + s - 97) % 26 + 97) 

    return result 

#check the above function 
text = "CIPHER CAESAR ENCRYPTION"
s = 4
print ("Text : " + text) 
print ("Shift : " + str(s)) 
print ("Cipher: " + encrypt(text,s))

message = 'GIEWIVrGMTLIVrHIQS' #encrypted message
LETTERS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'

for key in range(len(LETTERS)):
   translated = ''
   for symbol in message:
      if symbol in LETTERS:
         num = LETTERS.find(symbol)
         num = num - key
         if num < 0:
            num = num + len(LETTERS)
         translated = translated + LETTERS[num]
      else:
         translated = translated + symbol
print('Hacking key #%s: %s' % (key, translated))

import string
from time import sleep

alphabet = string.ascii_lowercase # "abcdefghijklmnopqrstuvwxyz"

def decrypt():

    print("Welcome to Caesar Cipher Decryption.\n")
    encrypted_message = input("Enter the message you would like to decrypt: ").strip()
    print()
    key = int(input("Enter key to decrypt: "))

    decrypted_message = ""

    for c in encrypted_message:

        if c in alphabet:
            position = alphabet.find(c)
            new_position = (position - key) % 26
            new_character = alphabet[new_position]
            decrypted_message += new_character
        else:
            decrypted_message += c

    print("\nDecrypting your message...\n")
    sleep(2) # give an appearance of doing something complicated
    print("Stand by, almost finished...\n")
    sleep(2) # more of the same
    print("Your decrypted message is:\n")
    print(decrypted_message)

decrypt()

pip -m install cryptography

import cryptography

from cryptography.fernet import Fernet as fn

test_key = fn.generate_key()
print(test_key)
file = open('test_key.key', 'wb')
file.write(test_key)
file.close()

from cryptography.fernet import Fernet as ft

message = input("\n Veuillez entrer le message que vous souhaiter crypter: \n").encode()

file = open('test_key.key', 'rb')
key = file.read()

f = ft(key)
encrypted_message = f.encrypt(message)
print("\n", encrypted_message)
file.close()

from cryptography.fernet import Fernet as ft

encypted_message = input("\n Veuillez coller le chiffrement à décrypter: \n\t").encode()

file = open('test_key.key', 'rb')
key = file.read()
f = ft(key)
decrypted_message = f.decrypt(encypted_message)
print("\n ", decrypted_message)
file.close()

import base64
import os
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC

password_provided = "password" # This is input in the form of a string
password = password_provided.encode() # Convert to type bytes
salt = b'salt_' # CHANGE THIS - recommend using a key from os.urandom(16), must be of type bytes
kdf = PBKDF2HMAC(
    algorithm=hashes.SHA256(),
    length=32,
    salt=salt,
    iterations=100000,
    backend=default_backend()
)
key = base64.urlsafe_b64encode(kdf.derive(password)) # Can only use kdf once

from cryptography.fernet import Fernet
key = b'' # Use one of the methods to get a key (it must be the same when decrypting)
input_file = 'test.txt'
output_file = 'test.encrypted'

with open(input_file, 'rb') as f:
    data = f.read()

fernet = Fernet(key)
encrypted = fernet.encrypt(data)

with open(output_file, 'wb') as f:
    f.write(encrypted)

# You can delete input_file if you want

from cryptography.fernet import Fernet
key = b'' # Use one of the methods to get a key (it must be the same as used in encrypting)
input_file = 'test.encrypted'
output_file = 'test.txt'

with open(input_file, 'rb') as f:
    data = f.read()

fernet = Fernet(key)
encrypted = fernet.decrypt(data)

with open(output_file, 'wb') as f:
    f.write(encrypted)

# You can delete input_file if you want