ImportError: No module named Crypto.Cipher

Question

When I try to run app.py (Python 3.3, PyCrypto 2.6) my virtualenv keeps returning the error listed above. My import statement is just from Crypto.Cipher import AES

Answer 1

On the mac... if you run into this.. try to see if you can import crypto instead?

If so.. the package name is the issue C vs c. To get around this.. just add these lines to the top of your script.

import crypto
import sys
sys.modules['Crypto'] = crypto

You know should be able to import paramiko successfully.

Answer 2

I found the solution. Issue is probably in case sensitivity (on Windows).

Just change the name of the folder:

• C:\Python27\Lib\site-packages\crypto
• to: C:\Python27\Lib\site-packages\Crypto

This is how folder was named after installation of pycrypto:

I've changed it to:

And now the following code works fine:

Answer 3

type command:

sudo pip install pycrypto

Answer 4

I solve this problem by change the first letter case to upper. Make sure ''from Crypto.Cipher import AES'' not ''from crypto.Cipher import AES''.

Answer 5

To date, I'm having same issue when importing from Crypto.Cipher import AES even when I've installed/reinstalled pycrypto a few times. End up it's because pip defaulted to python3.

~ pip --version
pip 18.0 from /usr/local/lib/python3.7/site-packages/pip (python 3.7)

installing pycrypto with pip2 should solve this issue.

Answer 6

Well this might appear weird but after installing pycrypto or pycryptodome , we need to update the directory name crypto to Crypto in lib/site-packages

Reference