How do I install PyCrypto on Windows?

If you don’t already have a C/C++ development environment installed that is compatible with the Visual Studio binaries distributed by Python.org, then you should stick to installing only pure Python packages or packages for which a Windows binary is available.

Fortunately, there are PyCrypto binaries available for Windows:
http://www.voidspace.org.uk/python/modules.shtml#pycrypto

UPDATE:
As @Udi suggests in the comment below, the following command also installs pycrypto and can be used in virtualenv as well:

easy_install http://www.voidspace.org.uk/python/pycrypto-2.6.1/pycrypto-2.6.1.win32-py2.7.exe

Notice to choose the relevant link for your setup from this list

If you’re looking for builds for Python 3.5, see PyCrypto on python 3.5

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