A protection domain can be scoped by a set of objects that are currently directly accessible by a principal, where a principal is an entity in the computer system to which permissions are granted. A principal can access objects in the protection domain by virtue of the permissions it enjoys over the objects in the … Read more
The Java programming language is one of the fastest-growing technologies in use on the Internet today. The principal reason why Java has scored over other languages is the promise that an application written once in Java can be run from any machine that has a JVM. From the early stages of Java development, it was … Read more
The Need for Java Security From its inception, Java has shown that it was designed for the net. Java brought about, for the first time on a large scale, the concept of dynamic loading of code from a source outside the system. Though this is very powerful, and adds several features to the system using … Read more
we use the public Internet, a specific computer network (and one which probably most readers have used), as our principle vehicle for discussing computer networking protocols. But what is the Internet? We would like to give you a one-sentence definition of the Internet, a definition that you can take home and share with your family … Read more
Now that we’ve got a bit of a feel for what the “Internet” is, let’s consider another important word is the title of this book: “protocol.” What is a protocol? What does a protocol do? How would you recognize a protocol if you met one? A Human Analogy It is probably easiest to understand the … Read more
JCA is described as a provider architecture. The primary principal in the design of the JCA has been to separate the cryptographic concepts from their algorithmic implementations. It is designed to allow different vendors to provide their own implementation of the cryptographic tools and other administrative functions. This makes a very flexible framework which willcater … Read more
The derivation of the word cryptography is from Greek and means literally secret writing . Modern cryptography is still involved in keeping data secret, but the ability to authenticate a user (and hence apply some kind of access control) is even more important. Although there are many cryptographic techniques and protocols, they mostly fall into … Read more
In the previous post We have discussed two parts of the world of Java, the development environment and the execution environment. The third part is where the world of Java meets the rest of the world, that is, the capabilities it provides for extending Java functions and integrating with applications of other types. The simplest … Read more
We have said that the JVM operates on the stream of bytecode as an interpreter. This means that it processes bytecode while the program is running and converts it to real machine code that it executes on the fly. You can think of a computer program as being like a railroad track, with the train … Read more
Once you have installed the Java 2 SDK, you can start creating Java source code and compiling it. Java is like any other high-level programming language, in that you write the source code in an English-like form. The source code then has to be converted into a form that the machine can understand before it … Read more