└── Шифрование и дешифрование текста


/Шифрование и дешифрование текста:
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 1 | from Crypto.Cipher import AES
 2 | from Crypto import Random
 3 | from binascii import b2a_hex
 4 | import sys
 5 | 
 6 | # get the plaintext
 7 | plain_text = sys.argv[1]
 8 | 
 9 | # The key length must be 16 (AES-128), 24 (AES-192), or 32 (AES-256) Bytes.
10 | key = b'this is a 16 key'
11 | 
12 | # Generate a non-repeatable key vector with a length
13 | # equal to the size of the AES block
14 | iv = Random.new().read(AES.block_size)
15 | 
16 | # Use key and iv to initialize AES object, use MODE_CFB mode
17 | mycipher = AES.new(key, AES.MODE_CFB, iv)
18 | 
19 | # Add iv (key vector) to the beginning of the encrypted ciphertext
20 | # and transmit it together
21 | ciphertext = iv + mycipher.encrypt(plain_text.encode())
22 | 
23 | 
24 | # To decrypt, use key and iv to generate a new AES object
25 | mydecrypt = AES.new(key, AES.MODE_CFB, ciphertext[:16])
26 | 
27 | # Use the newly generated AES object to decrypt the encrypted ciphertext
28 | decrypttext = mydecrypt.decrypt(ciphertext[16:])
29 | 
30 | # output
31 | file_out = open("encrypted.bin", "wb")
32 | file_out.write(ciphertext[16:])
33 | file_out.close()
34 | 
35 | print("The key k is: ", key)
36 | print("iv is: ", b2a_hex(ciphertext)[:16])
37 | print("The encrypted data is: ", b2a_hex(ciphertext)[16:])
38 | print("The decrypted data is: ", decrypttext.decode())
39 | 
40 | 
41 | #the end
42 | 


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