qr code generator asp net c# Before You Begin in Visual C#.NET

Generator QR Code in Visual C#.NET Before You Begin

Before You Begin
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Decoding QR Code 2d Barcode In Visual C#
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To complete the lessons in this chapter, you should be familiar with Microsoft Visual Basic or C# and be comfortable with the following tasks:
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Create a console application in Microsoft Visual Studio using Visual Basic or C#. Add references to system class libraries to a project. Write to files and streams.
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11
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QR Creator In Visual C#
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Application Security
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Lesson 1: Understanding Code Access Security
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If you have worked with previous versions of the .NET Framework, you might already be familiar with code access security (CAS) concepts. If you have been a Microsoft Windows developer but haven t previously used the .NET Framework, using CAS requires you to understand completely novel security concepts. This lesson describes the concept behind CAS and each of the components that the .NET Framework uses to implement CAS.
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After this lesson, you will be able to:
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Describe the purpose of CAS. List the four most important elements of CAS and the significance of each. Describe how security policy defines an assembly s permission set. Explain how CAS works with operating system security. Use the .NET Framework Configuration tool to configure CAS. Use Caspol to configure CAS.
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Create Code 39 Extended In .NET
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Estimated lesson time: 60 minutes
Reading EAN-13 In Visual C#.NET
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What Is Code Access Security
Code access security (CAS) is a security system that allows administrators and developers to control application authorization similar to the way they have always been able to authorize users. With CAS, you can allow one application to read and write to the registry, while restricting access for a different application. You can control authorization for most of the same resources you ve always been able to restrict using the operating system s role-based security (RBS), including the following:
The file system The registry Printers The event logs
You can also restrict resources that you can t control using RBS. For example, you can control whether a particular application can send Web requests to the Internet or whether an application can make DNS requests. These are the types of requests that
Lesson 1: Understanding Code Access Security
malicious applications are likely to make to abuse a user s privacy, so it makes sense that CAS allows you to restrict those permissions. Unfortunately, CAS can be applied only to managed applications that use the .NET Framework runtime. Unmanaged applications run without any CAS restrictions and are limited only by the operating system s RBS. If CAS is used to restrict the permissions of an assembly, the assembly is considered partially trusted. Partially trusted assemblies must undergo CAS permission checks each time they access a protected resource. Some assemblies are exempt from CAS checks and are considered fully trusted. Fully trusted assemblies, like unmanaged code, can access any system resource that the user has permissions to access.
Elements of Code Access Security
Every security system needs a way to identify users and determine what a user can and can t do, and CAS is no exception. However, because CAS identifies and assigns permissions to applications rather than to people, it can t use the user names, passwords, and access control lists (ACLs) that you re accustomed to. Instead, CAS identifies assemblies using evidence. Each piece of evidence is a way that an assembly can be identified, such as the location where the assembly is stored, a hash of the assembly s code, or the assembly s signature. An assembly s evidence determines which code group it belongs to. Code groups, in turn, grant an assembly a permission set. The sections that follow describe each of these components in more detail.
What Is Evidence
Evidence is the information that the runtime gathers about an assembly to determine which code groups the assembly belongs to. Common forms of evidence include the folder or Web site from which the assembly is running and digital signatures.
NOTE Evidence: a misnomer
Identification might be a better term than evidence. Evidence sounds like a set of clues you use to track down someone who didn t want to be identified. In CAS, evidence is used just like a person s passport, password, and PIN information that proves identity and describes an individual as deserving a certain level of trust.
Table 11-1 shows the common types of evidence that a host can present to the runtime. Each row corresponds to a member class of the System.Security.Policy namespace.
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