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Built-In Classes: The Privileged Few The JDK includes a class library that makes Java as powerful as it is. Since this code is part of Java itself, it is considered trustworthy. The fact that built-in Java classes bypass security measures has many implications. The system makes sense when you consider that this code is part of the Virtual Machine itself. If the VM is loaded before the Verifier, there is no choice but to consider the built-in Java classes trustworthy. It is not just JDK classes that can bypass security. In JDK 1.0, any class stored on the local file system and made part of the local approved set of classes will be considered a built-in class. Such classes are, however, only subject to automatic loading if they are placed in one of the subdirectories in the CLASSPATH. Making a change to the CLASSPATH, or placing a new class in one of these subdirectories is tantamount to making a fundamental change in your security policy. A good example of classes given built-in status is the set of class files included with Netscape Navigator: classes.zip. Under JDK 1.0, it is essential that you never install classes of unknown origin as built-in classes by putting

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where n 0; s2 is a normal distribution. However, when Xi are i.i.d. and drawn from some distribution F that is heavy tailed with tail index 1 < a < 2, then if we de ne Zn n1 1=a An m we nd that Zn 3 s a ;

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them in the CLASSPATH. Since the security checks are bypassed for this kind of byte code, granting such classes built-in status is very dangerous. Install only vendor-supplied classes as built-in classes. The file system loader (aka the Primordial Class Loader) shown in Figure 2.8 sets up the namespace for built-in classes. This namespace is special. The local namespace is exclusively reserved for built-in classes. This helps protect built-in classes (including essential classes like the Security Manager) from being spoofed by outside classes. Built-in classes may or may not be subjected to the Security Manager, depending on the policy of the site. Vendor-supplied classes often require unhindered access to system resources. Classes like the ClassLoader must be trusted in order to bootstrap the system.

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Non-Built-In Classes: The Unwashed Masses In JDK 1.0, all classes not considered built-in are subject to more strict security checks. Paths (1) and (2) of Figure 2.8 both apply to non-built-in classes. Classes in path (1) include all applets loaded from the network. Classes in path (2) include all applets loaded locally, but not specified in the CLASSPATH. It is not possible to stress heavily enough how important it is to consider carefully which classes you grant built-in status. If you install a Java class in your CLASSPATH it will no longer be subject to security checks. Only completely trusted code should be given this privilege. In summary, under JDK 1.0, built-in classes and classes loaded from the CLASSPATH are trusted classes. Classes loaded from a URL (either a file: type or an http: type) are untrusted classes.

where sa is an a-stable distribution. The a-stable distribution has four parameters: a, a location parameter (analogous to the mean), a scale parameter (analogous to the standard deviation), and a skewness parameter. Based on the value of the last parameter, the distribution can be either skewed or symmetric. A plot of the symmetric a-stable distribution with a 1:2 and location zero is shown in Fig. 3.4. From the gure it can be seen that this distribution has a bell-shaped body much like the normal distribution but that it has much heavier tails. In fact, the a-stable distribution has power-law tails that follow the same a as that of the distribution F from which the original observations were drawn. From Eqs. (3.5) and (3.6) we can make two observations about the behavior of sums of heavy-tailed random variables. First, Eq. (3.5) states that such sums may converge much more slowly than is typical in the nite variance case. Second, Eq. (3.6) states that, even after convergence, the sample mean will show high variability it follows a heavy-tailed distribution.

protections. The access controls that should be designed to meet requirements for regulatory compliance may turn out to be the key defense contributing to an organization s very survival from the next big IT worm or hack attack. The process of formalizing the effort to turn business needs into requirements and requirements into new systems and hardware has value and can pay dividends to the firms willing to trade some legacy systems, applications, and controls for ones designed to meet modern operational and control challenges.

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