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GTIN-13, EAN - 13 (ITF-14, GS1-128, GS1 DataMatrix, and GS1 QR). GTIN-14, ITF -14 ... These all incorporate, at least, a 13-digit number and the check digit is the same as that for a GTIN-13. Global Service Relation ... Symbology, Code , Result ...

Also, 15 discusses how MACs (message authentication codes) can be used to construct integrity check tokens that can either be added to each entry of a log or associated with an entire log file to allow you to detect any potential modifications to the system log You can also use write once, read many (WORM) media to store system logs, since once written, these logs may be hard (or even physically impossible) to modify short of destroying the media completely..

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Paths can be very useful for representing shapes that you need to draw over and over again, but their true potential is shown when they are combined with brushes (discussed next)..

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Now that you ve seen in detail how to use FormEncode and HTML Fill, you ll be pleased to know that Pylons provides an even simpler way of using the same functionality that is suitable for the majority of use cases you are likely to encounter. You can use it like this: def form(self): return render('/simpleform.html') @validate(schema=EmailForm(), form='form', post_only=False, on_get=True) def submit(self): return 'Your email is: %s and the date selected was %r.' % ( self.form_result['email'], self.form_result['date'], ) You ll need to import the @validate decorator at the top of the controller: from pylons.decorators import validate What this says is that if the data submitted to the submit() action contains any errors, then the request should be rerun as a GET request to the form() action. The result of calling the form() action is then passed through HTML Fill to render the errors and repopulate the form with the values that were submitted.

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import java .security. ... System.out.println(ans); //print out the checksum digit . /** ... of a EAN13 barcode and compute the check number at the end of the code.");.

Until now, we have focused on block-based symmetric encryption schemes, in which blocks of plaintext are encrypted at once. There exists another class of symmetric encryption schemes, called stream ciphers. In a stream cipher, one byte of plaintext is encrypted at a time, rather than 64, 128, or more bits at time. Stream ciphers are, in general, much faster than block ciphers. In a stream cipher, an infinite sequence of random bits is generated for use as the key, so the key bits are never reused. The theoretical motivation behind these stream ciphers is to attempt to approximate a theoretical encryption scheme called a one-time pad.

Brushes are used to fill shapes and paths. Until now you used brushes to fill the designated areas using solid colors. This is only a part of what is possible. Using different patterns, gradients, or even textures, you can fill your shapes in any conceivable way. When you create a QBrush object, you can specify a color and a style. The constructor is defined as QBrush(QColor, Qt::BrushStyle). The QBrush is then given to a QPainter using the setBrush method. The style of the brush controls how the color is used when filling shapes. The simplest styles are patterns, which are used when you need to fill a shape with lines or a dithered shade. The available patterns and corresponding enumerated styles are shown in Figure 7-15.

Python 2.3 doesn t support decorators, so rather than using the @validate() syntax, you need to put email = validate(schema=EmailForm(), form='form', post_only=False, on_get=True)(email) after the e-mail function s declaration.

By default, if you don t specify post_only=False and on_get=True to the @validate decorator, validation would occur only on POST requests, so you would need to alter your form definition so that the method is a POST: <% h.form(h.url_for(action='submit'), method='post') %>

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