此章描述的模块实现了加密性质的各种算法。它们可以在安装时自由裁量。在 Unix 系统，
crypt
模块也可用。这里是概述：
Hardcore cypherpunks will probably find the cryptographic modules written by A.M. Kuchling of further interest; the package contains modules for various encryption algorithms, most notably AES. These modules are not distributed with Python but available separately. See the URL http://www.pycrypto.org/ 了解更多信息。
