Dr. Dobb's Journal - October 2008 - (Page 37)

D10gold_p6as 8/15/08 9:07 AM Page 37 For Adobe AIR, there are two important chains: The one used to establish the publisher ID and the one used, at install time, to establish trust. The former impacts application identity and therefore must not change; this is why it’s required to be embedded in the keystore used for signing. It doesn’t matter if this chain is trusted at install time. It only matters that the publisher trusts the entities in this chain to properly renew their certificate. The second chain, built at install time, is used to establish trust. This chain may differ between target machines, assuming it can be built at all. It may or may not match the publisher ID chain, and the presence of the publisher ID chain does not guarantee that a chain can be built at installation time. 3. You can read the publisher ID directly from an installed application in the METAINF/ AIR/publisherid file. (This is inside the Contents/Resources directory on Mac OS installs.) Publisher IDs specified to adl are not validated—nothing prevents anyone from entering a publisher ID they don’t own. Publisher IDs provide secured identity for installed applications; they don’t provide any guarantees with respect to applications being run with the debugging tools. If you need to communicate with another application—for example, to address it via LocalConnection—then you need its publisher ID as well. If you’ve installed that application, you can find its publisher ID in the publisherid file, as mentioned in step 3. Even without the application, however, you might be able to obtain the publisher ID from the application’s publisher. Publisher IDs do not contain any confidential data and can be comfortably posted on websites and the like. Timestamping and Longevity Key pairs, as used for creating digital signatures, become less secure the older they are. Living in a Digital Imaging World WHERE IT ALL BEGAN Founded in 1991 and headquartered in Tampa, Florida, Pegasus Imaging Corporation delivers digital imaging software development components, image compression and image editing technologies. The company exceeds Living in a Digital Imaging World WHERE IT ALL BEGAN Founded in 1991 and headquartered in Tampa, Florida, Pegasus Imaging Corporation delivers digital imaging software development components, image compression and image editing technologies. The company exceeds speed and quality requirements for document imaging, forms processing, medical imaging, color/photo imaging, video applications and more. Technology is delivered as Microsoft .NET controls, COM controls, DLLs and applications. Multiple platforms are supported, including Windows, LINUX, Solaris, IBM AIX and Mac OS X. Developing with Publisher IDs Publisher IDs operate in a straightforward way for installed applications, but can be trickier during development. There are two sides to this: your own publisher ID, and the publisher ID for another application you need to communicate with. When you debug an application (started via the adl command), it is not yet signed and so runs without a publisher ID. During debugging, anywhere that a publisher ID would normally be used—for example, in a LocalConnection endpoint name—it is simply omitted. This will change, however—and a publisher ID will be used— once the same application has been installed. This is often fine, but can be tricky in certain workflows. Suppose you install a version of the application on your machine and then debug the application on the same machine. You might expect both to access the same location as the application’s storage directory, but they won’t, because that location uses the publisher ID. To work around this, you can specify a publisher ID for debugging sessions with adl’s -pubid argument. There are a few ways to obtain your own publisher ID: 1. You might already know it. Remember, publisher IDs are tied to your signing certificate—not the signature. If you use the same signing certificate across multiple applications, they all have the same publisher ID. 2. You can determine it at runtime via the NativeApplication.publisherIdentifier property, assuming you’re running an installed copy of the application. speed and quality requirements for document imaging, forms processing, medical imaging, color/photo imaging, video applications and more. Technology is delivered as Microsoft .NET controls, COM controls, DLLs and applications. Multiple platforms are supported, including Windows, LINUX, Solaris, IBM AIX and Mac OS X. SCANNED TIFF This image is here to show how incredible the compression is for the Pegasus imaging products. It handles images as well as text. This image is here to show how incredible the compression is for the Pegasus imaging products. It handles images as well as text. AN EYE ON GROWTH Pegasus Imaging Corporation was founded in 1991 as a reseller of fractal image compression and decompression toolkits and digital image compression applications. The company entered the imaging marketplace at a very early stage with a far-reaching vision. To satisfy customer demand for well-supported commercial image compression technologies, the company focused on optimizing standards-based compression technology for speed and quality. Pegasus was rapidly shifting from being a provider of end user utilities to marketing business-to-business solutions. A testament to the company’s technology leadership, Pegasus Imaging is the only surviving commercial supplier of JPEG compression technology in the world. Well known photo imaging customers of Pegasus JPEG today include Kodak, Canon, Nikon, Fujifilm, Konica Minolta, and many others. The company’s strategy in the mid-1990s was to clearly differentiate Pegasus from its competition through investment in digital imaging research and development. The company’s senior scientists joined the team at this time. They are recognized throughout the industry, and provide Pegasus with a solid competitive edge. Pegasus Imaging is distinguished by its ability to deliver multiple interfaces to advanced technologies based on an extensive collection of intellectual capital, scientific research, and product innovations. Today, the company holds a portfolio of 11 patents granted, 12 patents pending, and a AN EYE ON GROWTH Pegasus Imaging Corporation was founded in 1991 as a reseller of fractal image compression and decompression toolkits and digital image compression applications. The company entered the imaging marketplace at a very early stage with a far-reaching vision. To satisfy customer demand for well-supported commercial image compression technologies, the company focused on optimizing standards-based compression technology for speed and quality. Pegasus was rapidly shifting from being a provider of end user utilities to marketing business-to-business solutions. A testament to the company’s technology leadership, Pegasus Imaging is the only surviving commercial supplier of JPEG compression technology in the world. Well known photo imaging customers of Pegasus JPEG today include Kodak, Canon, Nikon, Fujifilm, Konica Minolta, and many others. The company’s strategy in the mid-1990s was to clearly differentiate Pegasus from its competition through investment in digital imaging research and development. The company’s senior scientists joined the team at this time. They are recognized throughout the industry, and provide Pegasus with a solid competitive edge. Pegasus Imaging is distinguished by its ability to deliver multiple interfaces to advanced technologies based on an extensive collection of intellectual capital, scientific research, and product innovations. Today, the company holds a portfolio of 11 patents granted, 12 patents pending, and a SEARCHABLE PDF ONE OF THESE IMAGES IS 66% * THAN THE OTHER. With Pegasus Imaging SDKs, you can turn a scanned TIFF into a searchable image-over-text PDF and make the file a fraction of its original size. Save server space and search documents that were originally not searchable. We’ll show you how we do it, and give you the sample code in C#. Challenge our support team with your next imaging question. If they can’t answer it, our scientists surely will. CHECK OUT OUR NEW WHITE PAPER & FREE SAMPLE CODE. PEGASUSIMAGING.COM/TIFF-TO-PDF SMALLER PEGASUSIMAGING.COM (800) 875-7009 Pegasus is a registered trademark of Pegasus Imaging Corporation in the United States. *Results vary depending on image content. October 2008 l www.ddj.com l Dr. Dobb’s Journal http://PEGASUSIMAGING.COM/TIFF-TO-PDF http://PEGASUSIMAGING.COM http://PEGASUSIMAGING.COM http://www.ddj.com

Table of Contents Feed for the Digital Edition of Dr. Dobb's Journal - October 2008

Dr. Dobb's Journal - October 2008 Contents Friday Night Fish Fry Alia Vox Developer Diaries Developer’s Notebook Is Your Next Language COBOL? Conversations Safe Coding Practices Code Signing in Adobe AIR OpenID Single Sign-On The Book Cipher Algorithm Indexing and Searching Image files Extending Continuous Integration Into ALM The Agile Edge Effective Concurrency Swaine’s Flames

Dr. Dobb's Journal - October 2008

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