Meilleure réponse
Il existe de nombreuses options pour crypter un fichier en python.
Utilisation de la bibliothèque PyCrypto: PyCrypto est une collection de fonctions de hachage sécurisées et de divers algorithmes de chiffrement. Installez dabord PyCrypto package en exécutant cette commande sur CMD
pip install pycrypto
Le code de chiffrement de fichier à laide de lalgorithme AES est indiqué ci-dessous
import os, random, struct
from Crypto.Cipher import AES
def encrypt\_file(key, in\_filename, out\_filename=None, chunksize=64*1024):
""" Encrypts a file using AES (CBC mode) with the
given key.
key:
The encryption key - a string that must be
either 16, 24 or 32 bytes long. Longer keys
are more secure.
in\_filename:
Name of the input file
out\_filename:
If None, "
chunksize:
uses to read and encrypt the file. Larger chunk
sizes can be faster for some files and machines.
chunksize must be divisible by 16.
"""
if not out\_filename:
out\_filename = in\_filename + ".enc"
iv = "".join(chr(random.randint(0, 0xFF)) for i in range(16))
encryptor = AES.new(key, AES.MODE\_CBC, iv)
filesize = os.path.getsize(in\_filename)
with open(in\_filename, "rb") as infile:
with open(out\_filename, "wb") as outfile:
outfile.write(struct.pack("
outfile.write(iv)
while True:
chunk = infile.read(chunksize)
if len(chunk) == 0:
break
elif len(chunk) \% 16 != 0:
chunk += " " * (16 - len(chunk) \% 16)
outfile.write(encryptor.encrypt(chunk))
Utilisation de PyAesCrypt: module de chiffrement à trois fichiers Python qui utilise AES256-CBC pour chiffrer et déchiffrer les fichiers
pip install pyAesCrypt
Exemple de code ci-dessous:
import pyAesCrypt
# encryption/decryption buffer size - 64K
bufferSize = 64 * 1024
password = "foopassword"
# encrypt
pyAesCrypt.encryptFile("data.txt", "data.txt.aes", password, bufferSize)
# decrypt
pyAesCrypt.decryptFile("data.txt.aes", "dataout.txt", password, bufferSize)
La bibliothèque de cryptographie Python peut également être une bonne option pour le chiffrement
Réponse
Le moyen le plus simple de crypter des fichiers avec python sera dutiliser module de cryptographie .
1.Installation:
pip/pip3 install cryptography
2.Code:
Nous aurons un fichier vidéo nommé " myvideo.mp4 " pour le crypter et le programme principal "main.py" .
"""
filename: main.py
author: SANDIPAN CHOWDHURY
purpose: Encrypting any file
This program is posted on Quora on 9th January, 2021
"""
#imports
from cryptography.fernet import Fernet
def sancrypt(filename):
"This function Encrypt the file"
key=Fernet.generate\_key()
key\_master=Fernet(key)
with open (filename,"rb") as f:
data=f.read()
encr\_data=key\_master.encrypt(data)
with open(filename+".sancrypted","wb") as f:
f.write(encr\_data)
with open(filename+".key","wb") as f:
f.write(key)
def desancrypt(filename,keyfilename):
"This function decrypt the filename with keyfilename"
with open(filename,"rb") as f:
encr\_data=f.read()
with open(keyfilename,"rb") as f:
key=f.read()
keymaster=Fernet(key)
decr\_data=keymaster.decrypt(encr\_data)
with open(filename.replace(".sancrypted",""),"wb") as f:
def main():
x=input("""
1. Encrypt
2. Decrypt
Enter a number?
""")
if x=="1":
filename=input("Enter a filename: ")
try:
sancrypt(filename)
print("File Encrypted.")
main()
except Exception as e:
print("File Encryption Failed")
print(str(e))
main()
elif x=="2":
filename=input("Enter filename with ".sancrypted" extension: ")
keyfile=input("Enter filename with ".key" extension: ")
try:
desancrypt(filename,keyfile)
print("File Decrypted.")
main()
except Exception as e:
print("Decryption Failed.")
print(str(e))
main()
else:
print("Invalid Input. Must be 1 or 2")
main()
if \_\_name\_\_=="\_\_main\_\_":
main()
Essayez toujours dutiliser le fichier de clé correct pour fichier de données, soit il échoue sûrement. Il faut environ 30 minutes pour écrire ce programme. Veuillez valider ma réponse.