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4. List three advantages/disadvantages of using a web of trust model vs. using a certificate authority based trust model. 5. Extend the AESEncrypter program of Section 12.1.6 to compute and verify a MAC on the message in addition to encrypting and decrypting data. Be sure to use different keys for the encryption and MAC computations. 6. State how you can use symmetric encryption to achieve (a) authentication, (b) confidentiality, and (c) message integrity. 7. Write a Java program that computes HMAC-SHA-256. Use the Mac class in the Java Cryptography library. Do not write a program that constructs HMACs using the MessageDigest class, or attempt to write your own implementation of a hash function! Your program should accept a key file as a command-line argument (similar to the AESEncrypter program in Section 12.1.6), and should use the standard input and output streams. The program should output a base64- or hex-encoded 256-bit keyed hash of its input. 8. Learn about the openssl and/or Java keytool command-line utility programs. Use them to generate an RSA key pair, and generate a certificate-signing request that you could submit to a CA. 9. Add a secure logging feature to SimpleWebServer. The secure logging feature should write an integrity check code to each log entry. Use a MAC to protect each record and the entire file. What are the performance challenges in including such functionality

The Brush class is an abstract class that provides the functionality for painting an area. Classes derived from it show how the area can be painted.

n this appendix, we provide a brief review of security techniques that can be used to achieve defense-in-depth, and suggest a very simple way in which you can categorize the threats to and defense mechanisms for your software1 In this appendix, we do not consider a particular application, but you can apply our categorization technique to any application Programmers need to address many types of security concerns when designing systems Some of these concerns can be categorized as threats involving failure (F), lies (L), and infiltration (I) Hence, we call our framework FLI As we present defense techniques, we will also discuss whether they allow a system to prevent, detect, contain, and/or recover from the FLI security problems.

Create a new C# Workflow Activity Library project called SendEmailC. Rename Activity1.vb to SendEmailVB.vb. Again, the composite Activity1 will be within the workflow. Open the properties for this activity and change the Name property to SendEmailVB. Click the ellipse next to the BaseClass property. This opens the .NET type window. Click the System.Workflow.ComponentModel assembly under the Referenced Assemblies selection. Click the Activity type so the type name at the top of the box is System.Workflow.ComponentModel.Activity. Click OK. This changes the class the activity inherits from to the Activity class, instead of the SequentialActivity class that was used in the previous example. You ll also notice that the design of the activity within the designer has changed. Change the Description property to Use to send email via SMTP, uses C#. You define properties for a new activity using the DependencyProperty. To create a DependencyProperty, first you need to declare the property using the following format: Public static [Property Name] as DependencyProperty = DependencyProperty.Register([Name others will see], typeof([data type],typeof[activity class name])); The properties for this activity would be defined as follows: namespace SendEmailC { public partial class SendEmailC : System.Workflow.ComponentModel.Activity { public static DependencyProperty FromProperty = DependencyProperty.Register("From", typeof(string), typeof(SendEmailActivity), new PropertyMetadata("someone@example.com")); public static DependencyProperty ToProperty = DependencyProperty.Register("To", typeof(string), typeof(SendEmailActivity), new PropertyMetadata("someone@example.com"));

We do not cover each of these security techniques in detail here, but we do cover the basic ideas and provide references to papers and books that you can read to learn more Such techniques are written in italics, and bibliographic references to where you can learn more are listed in Section A6 Keep in mind that many ideas or techniques may fall in different regions of our map, so there is more than one way to organize the constituent components To start with, by failure we mean the halt of processing of one or more system components as a result of expected or unexpected shutdown or malfunction For example, a file server may temporarily fail due to a user inadvertently kicking the power cord A user or node lies when it provides false information or pretends to be someone else.

The simplest use of a brush is when you use the Fill property of any shape that supports it and then use a predefined brush such as Black, Beige, or White. For example, you can create an ellipse that fills the viewport and colors itself black like this: <Ellipse Fill="Black" /> You can see the result of this in Figure 7-1.

For example, two inventors may both claim that their invention was submitted first to an online patent registration system In an infiltration, an adversary attempts to break into the system and use one or more resources or capabilities available to the system to his advantage For example, an adversary may want to infiltrate a Microsoft Exchange e-mail server to cause it to attach a virus to all outgoing e-mails In this example, the server s ability to send mail to users is the capability that the adversary takes advantage of Note that there are relationships between these various threats For example, infiltration can be used to cause a failure Similarly, lying can be used to infiltrate a system..

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