Даниил Ибрагимов, Пожалуйста!

Thanks for the feedback. Let me know if are interested in other aspects of encryption / Python.

really helpful 🤩🤩🤩🤩

@@practicalpythonsolutions-b4478 is there a way to hide data inside image or Dicom pixel data? (Stegonography) thank you

@@pascalsimo8968 ive done this project for my client

The keys and data must be in multiples of 16 bytes or 128 bits. I put a function in to pad the data: def pad_message(file): while len(file) % 16 != 0: file = file + b'0' return file you can see the file at: github.com/pmahon2016/symmetric_encryption/blob/master/file_pycrypto_encrypt.py

Hi there - where are you getting this message. Can you narrow it down to a particular line of code?

I also get that problem, try this code from Crypto.Cipher import AES import hashlib password = b"mypassword" key = hashlib.sha256(password).digest() mode = AES.MODE_CBC IV = b"This is an IV456" cipher = AES.new(key, mode, IV) message = b"1234567890123456" mensaje_encryptado = cipher.encrypt(message) print(mensaje_encryptado)

@@practicalpythonsolutions-b4478 me too but the issue im having , when ever i want to encrypt the variable like this ,ciphertext = cipher.encrypt(padding_message) print(ciphertext) i get the error Object type cannot be passed to C code, pls how can fix this

You are very welcome. I am glad you found it useful!

pyCrypto?

Yes, will need to be the same

Cameron - how are you "adding the file" Can you look at the file attributes to see if there is actually a permission issue? If you are in PyCharm and having issues adding a file... you could create one and see if that works. Let me know where exactly you are getting the error

@@practicalpythonsolutions-b4478 I figured out the problem, thank you for the response. However now, I am able to encrypt the file but when I go to decrypt the file, I get the error "Data must be padded to 16 byte boundary in CBC mode." I feel like this is an easy fix, but can not figure it out. Thank you!

@@cameronmann8825 yeah, when you encrypted it, the data should ahve been padded github.com/pmahon2016/symmetric_encryption/blob/master/file_pycrypto_encrypt.py

@@cameronmann8825 See below the code. Make sure you padded when you encrypted github.com/pmahon2016/symmetric_encryption/blob/master/file_pycrypto_decrypt.py

@@practicalpythonsolutions-b4478 Thank you again for the quick response. When I encrypt the file I get a message saying it is not UTF-8 encoded, does this mean I encrypted the message correctly, or is there another problem. Thank you.

Hi. Sorry for the late reply. I am back online and I will create a short in the next few days to answer your question. Thank you for your understanding.

You are probably correct but selecting a longer key lenght should help. But as suggested in the video, you should consider using Pycryptodome instead of Pycrypto going forward as it fixes some of the flaws in Pycrypto.

There is an issue with pycrypto and pycryptodome so make sure you don t have both installed. Do a “pip list” to verify. You can also uninstall pycrypto and reinstall. Type ‘pip remove pycrypto ‘ If not, let me know the error

you may need to uninstall pycryptodome first as it conflicts, and then install. Do a pip3 list to see what you have installed already.

@@practicalpythonsolutions-b4478 Command "C:\Users\sevav\PycharmProjects ike_click\venv\Scripts\python.exe -u -c "import setuptools, tokenize;__file__='C:\\Users\\sevav\\AppData\\Local\\Temp\\pip-install-1zq3_eyk\\pycrypto\\setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().repla ce(' ', ' ');f.close();exec(compile(code, __file__, 'exec'))" install --record C:\Users\sevav\AppData\Local\Temp\pip-record-u8lllff5\install-record.txt --single-version-externally-managed --compile --install-headers C:\Users\sevav\PycharmProjects ike_click\ven v\include\site\python3.7\pycrypto" failed with error code 1 in C:\Users\sevav\AppData\Local\Temp\pip-install-1zq3_eyk\pycrypto\

@@user-ry2lk6ol3s this is on Windows. Did you get this during the install or when you tried to import?

Python Practical Solutions - By Paul Mahon on install

Всеволод Овчинииков can you do a “pip3 list”

Hi not sure what that means but this code was run on 3.8 and other versions. What exactly does not run. i.e. what command are you typing and the error associated?

@@practicalpythonsolutions-b4478 Thanks tor quick response! I fixed the issue and I paste the code below if someone else needs it. just a small tips: Avoid installing Pycrypto library because it gives you a bunch of errors. Instead, use Pycryptodome library. Encryption part from Crypto.Cipher import AES import hashlib pas = input("Enter your password to encrypt: ").encode('utf-8') msg = input("Enter the message you want to encrypt: ").encode('utf-8') def padding(msg): while len(msg) % 16 != 0: msg = msg+b" " return msg key = hashlib.sha3_256(pas).digest() cipher = AES.new(key, AES.MODE_CBC) msg_pad = padding(msg) encrypt_msg = cipher.encrypt(msg_pad) with open('data', 'wb') as wfile: wfile.write(cipher.iv) wfile.write(encrypt_msg) Decryption part from Crypto.Cipher import AES import hashlib pas = input("Enter your password to encrypt: ").encode('utf-8') key = hashlib.sha3_256(pas).digest() with open('data', 'rb') as rfile: cipher = AES.new(key, AES.MODE_CBC, rfile.read(16)) decrypt_msg = cipher.decrypt(rfile.read()) decrypt_msg = decrypt_msg.decode('utf-8') print(decrypt_msg.rstrip()) Thx

github.com/pmahon2016/symmetric_encryption.git

Yes will do. Thanks for mentioning

the password is really the key in this case. Or at least the key is derived from the password. If this doesn't answer your question ..give me the specific line of code but that is generally the case

@@practicalpythonsolutions-b4478 Traceback (most recent call last): File "C:\Users\Bhawana\PycharmProjects\pythonProject\main.py", line 16, in encrypted_message = cipher.encrypt(padded_message) File "C:\Users\Bhawana\AppData\Local\Programs\Python\Python39\lib\site-packages\Crypto\Cipher\_mode_cbc.py", line 178, in encrypt c_uint8_ptr(plaintext), File "C:\Users\Bhawana\AppData\Local\Programs\Python\Python39\lib\site-packages\Crypto\Util\_raw_api.py", line 232, in c_uint8_ptr raise TypeError("Object type %s cannot be passed to C code" % type(data)) TypeError: Object type cannot be passed to C code

i am getting this error

Hi - there is a problem with pycrypto and pycryptodome. Make sure you do NOT have both installed. Run a "Pip[3] list" to confirm. if not, uninstall and reinstall - ie. pip[3] uninstall pycrypto. If all that fails ....give me the specific error when you import the library

@@practicalpythonsolutions-b4478 Package Version --------------- --------- certifi 2020.6.20 cffi 1.14.0 chardet 3.0.4 crypto 1.4.1 cryptography 2.9.2 cycler 0.10.0 idna 2.10 imageio 2.8.0 kiwisolver 1.2.0 matplotlib 3.2.2 Naked 0.1.31 numpy 1.19.0 Pillow 7.1.2 pip 20.2.4 pycparser 2.20 pyparsing 2.4.7 python-dateutil 2.8.1 PyYAML 5.3.1 requests 2.24.0 shellescape 3.8.1 six 1.15.0 urllib3 1.25.11 this is my installed list

not sure w/o the actual error. But what would be great is to setup a virtual env to test it separately :below is on a linux or mac but google it if different for you: pip3 install virtualenv mkdir test_pycrypto cd test_pycrypto virtualenv test_py source test_py/bin/activate run pip3 to install pycrypto in the separate env to see if it works there.

Make sure that you do not have pycryptodome installed . Do a “pip3 list” to confirm