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The ciphers covered thus far in this chapter are called block ciphers because they take input blocks of 64, 128, 192, or 256 bits at a time. However, we have not talked about how to encrypt more data than a couple hundred bits at a time. For example, suppose we have a 1-MB document of plaintext that we would like to encrypt with a 64-bit key using DES (1 MB is 16,384 64-bit blocks). We could take each of these 64-bit blocks of plaintext input and independently run each of them through DES to produce 16,384 64-bit blocks of ciphertext. This technique is called Electronic Code Book (ECB) mode encryption. It is conceptually equivalent to looking up each 64-bit plaintext block in a large electronic code book to determine what the corresponding ciphertext block should be. The problem with ECB is that it is likely that some of the 64-bit plaintext blocks are repeated many times in the 1-MB document. For instance, if the document is made up of text, and the word security appears frequently in the document aligned on 64-bit boundaries, then the ciphertext corresponding to security will appear in the encrypted document just as frequently. ECB leaks information about the structure of the document to the attacker.

The virtualenv.py script has two interesting command-line options that you can use when creating your virtual Python environment: --no-site-packages: Don t make the global site-packages directory accessible in the virtual environment. --clear: Delete any previous install of this virtualenv and start from scratch. The examples so far have used the --no-site-packages option, but you can leave this option out if you prefer your virtual Python environment to also have access to all the packages already installed into the system Python environment.

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A point on the screen is represented by a QPoint object, and you can specify the x and y values for a point in the constructor. A point is usually not enough to draw something; to specify a point alongside a width and a height you can use the QRect class. The QRect constructor accepts an x value, a y value, and a width, followed by a height. Figure 7-3 shows a QRect and QPoint in a coordinate system.

Easy Install allows you to be very specific about the version of a particular piece of software you want to install. Let s use the PasteDeploy package again as an example. To install the latest version of the PasteDeploy package used by Pylons and its dependencies, you would simply run this command, as you ve already seen: $ easy_install PasteDeploy To install the PasteDeploy package version 1.7, you would use this: $ easy_install "PasteDeploy==1.7" You can also have more complicated version requirements. For example, to install a version of the PasteDeploy package between 1.5 and 1.7 inclusive, you could do this: $ easy_install "PasteDeploy>=1.5,<=1.7"

The approach to preventing XSSI is closely related to the methods for preventing XSRF introduced in Section 10.3. Since we cannot prevent third-party sites from loading resources from our site, we have to find a way for our server to distinguish such references from legitimate ones in order to deny them.

There are two classes closely related to QPoint and QRect: QPointF and QRectF. They are equivaTip

You can also use Easy Install to upgrade packages. You use the easy_install command in a similar way but specify the -U flag to tell Easy Install to upgrade the package. Notice how you can still specify version requirements even when upgrading: $ easy_install -U "PasteDeploy>=1.5,<=1.7" Of course, you can also use Easy Install to directly install eggs that exist on your local system. For example, to install the Python 2.5 egg for the PasteDeploy package, you could issue this command: $ easy_install PasteDeploy-1.7-py2.5.egg You can use Easy Install to install source distributions that were created with the old distutils module that forms part of the Python distribution and that Easy Install is designed to replace: $ easy_install PasteDeploy-1.5.tar.gz In this case, Easy Install first creates the .egg file from the source distribution and then installs it. Easy Install is also equally happy taking URLs as arguments as well as package names or paths to local files on the filesystem.

lent, but operate on floating-point values. Almost all methods that accept a rectangle or point can accept either type of rectangle or point.

The strongest method for preventing XSSI is to apply the scheme for preventing XSRF introduced in Section 10.3.3 to requests that return dynamic JavaScript containing session-specific data. With this method, the application would validate that an additional query parameter

Easy Install works by maintaining a file in your Python installation s lib/site-packages directory called easy_install.pth. Python looks in .pth files when it is starting up and adds any module ZIP files or paths specified to its internal sys.path. Easy Install simply maintains the easy_install.pth file so that Python can find the packages you have installed with Easy Install. If you ever want to remove a package, the easiest way is to remove its entry from the easy_install.pth file. You shouldn t ever need to remove a package, though, because Easy Install will always use the last one you installed by default.

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