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We can implement digital signatures using asymmetric algorithms such as RSA, ECC, and IBE, as discussed in 13 In the following subsections, we describe how to use asymmetric encryption operations F and F 1 to implement a digital signature scheme, and we do so in two steps First, we introduce two basic functions, S() and V(), which help us do some primitive signature and verification operations, and then show how S() and V() can be used to implement the Sign() and Verify() operations Since asymmetric operations are usually very computationally expensive, instead of applying them over the entire message M (which could be megabytes or even gigabytes), we apply asymmetric encryption and decryption operations over the secure hash of the message, h(M) We can sign a message by decrypting its hash with a secret key:.

If you visit http://127001:5000, you will see the standard Pylons introduction page served from the application s public/indexhtml file as before Pylons looks for resources in the order applications are specified in the cascade object in config/middlewarepy You ll learn more about the cascade object in 17, but it causes static files such as the introduction page to be served in preference to content generated by your Pylons controllers for the same URL You will want the SimpleSite controllers to handle the site s home page, so remove the welcome page HTML file: $ cd simplesite $ rm public/indexhtml If you now refresh the page, the Pylons built-in error document support will kick in and display a 404 Not Found page to tell you that the URL requested could not be matched by Pylons.

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Breaking a string over multiple lines does not affect the result. From the C++ compiler s viewpoint, Tip the string "foo" line break "bar" is identical to the string "foobar". Sometimes it is handy to be able to break down a line because it can be used to increase the readability or simply to fit the code onto the paper when printing it.

You ll now customize the controller so that it can display pages Each of the pages is going to have its own ID, which the controller will obtain from the URL Here are some example URLs that the controller will handle: /page/view/1 /page/view/2 .. etc /page/view/10 You ll also recall that Pylons comes with a routing system named Routes, which you saw in 3 and will learn about in detail in the next chapter The default Routes setup analyzes the URL requested by the browser to find the controller, action, and ID This means that to handle the URLs, you simply need a controller named page that has an action named view and that takes a parameter named id Let s create the page controller Once again, Pylons comes with a tool to help with this in the form of a plug-in to Paste.

The reason we decrypt with the secret key is that we only want the signer to be able to create signatures. However, we want anybody to be able to verify the signature with the public key. As such, to verify a signature, given a public key, we can use the following test to compute V(), our verification function:

Although it is possible to represent new-lines with the <br /> HTML tag, Qt actually supports many HTML tags that can make formatting tooltips much easier. Listing 9-3 shows some of the formatting that is possible. The resulting tooltip is shown in Figure 9-2. Listing 9-3. An HTML-formatted tooltip label->setToolTip( tr("<p>It is possible to do lists.</p>" "<ul>" "<li>You can <i>format</i> text.</li>" "<li><b>Bold</b> is possible too.</li>" "<li>And the <font color='#22aaff'>color</font> and " "<font size='+2'>size</font>.</li>" "</ul>" "<p>You can do ordered lists as well.</p>" "<ol>" "<li>First.</li>" "<li>Second.</li>" "<li>Third.</li>" "</ol>") );

You create the controller like this (notice that the command doesn t include the create part, which is used when creating a project template): $ paster controller page Creating /Users/james/Desktop/SimpleSite/simplesite/controllers/pagepy Creating /Users/james/Desktop/SimpleSite/simplesite/tests/functional/test_pagepy This creates two files one for any tests you are going to add for this controller (see 12) and the other for the controller itself The command would also add these files to Subversion automatically if your Pylons application were already being managed in a Subversion repository The controllers/pagepy file that is added looks like this: import logging from pylons import request, response, session, tmpl_context as c from pylonscontrollersutil import abort, redirect_to from simplesitelibbase import BaseController, render #import simplesitemodel as model log = logginggetLogger(__name__) class PageController(BaseController):.

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