Computer security by time life books

TrueCrypt can create a virtual encrypted disk inside a file and mount it as a real disk. It can also encrypt an entire partition and start an operating system from inside the encrypted partition. You can even create a hidden encrypted disk inside a regular virtual encrypted disk. If at one point you are forced to give others access your computer in whatever situationthey might see the file of the regular encrypted disk, and pressure you for its password.

Computer security by time life books

Trends in MVS Security: This article was first written inupdated in November,and updated again in July of MVS has been the environment for which the best-known and most widely used security products have been developed, and it has influenced our thinking about security for all computer systems.

But MVS security is not a static concept; it is a moving target on which security product vendors and infosecurity professionals must keep focused. Data security officers need to understand the history of MVS security, and they should be aware of the recent developments. This takes on greater importance since the mainframe is not dying or going away.

Computer security by time life books

The Gartner Group calculates that the cost per user and cost per transaction is often lower on a mainframe than on other platforms. It is relatively easy to demonstrate that MVS provides the most secure and most reliable version of: In discussing MVS security, five basic ideas should be kept in mind: The different protective tools available with MVS are all inter-related.

Computer security by time life books

A weakness in one undermines the security of them all. Security tools have evolved in response to the increasing complexity of the operating system, including the number and type of users and programs supported.

This complexity also includes the increasing number of system software components. The security provided by these tools is based on two basic questions: Each security tool addresses at least one of these questions.

As tools increased in sophistication, they have relied less on hardware controls, and more on software controls. This has required more attention and greater effort by security administrators to ensure that security tools are used rigorously and consistently.

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As more types of hardware and software are interconnected including: When this is not well understood, security officers may not be informed of changes in a timely fashion, and they may not be able to provide adequate, efficient control.

To provide comprehensive computer security, it is important to understand the different security features available to MVS systems and how they fit together: Security Through Hardware MVS's evolution may be viewed in several stages, each of which was built upon its predecessors and upon basic hardware controls to support computer security.

Since only one job or program could execute at a time, there was no need to prevent one program from interfering with another. In this sense, one of the earliest controls was isolation - that is, allowing only one program to execute at a time.

Computer security - Wikipedia

In addition, PCP relied on two basic hardware controls to prevent programs from interfering with the operating system itself. These were supervisor state and protect keys. When it is on in supervisor stateprograms can execute any instruction given them. When the switch is off the problem program statehowever, programs cannot execute privileged instructions - such as sending a command to a tape drive to start reading data.

As a general rule, MVS reserves supervisor state for itself, causing all application programs to execute in problem program state. Any time a program needs some powerful function, it must issue a supervisor call instruction to request the operating system to perform it.

For example, to read data in from a tape drive, a program must issue a supervisor call instruction to request MVS to tell the tape drive to perform the read.

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MVS will execute the necessary privileged instructions, but only after performing various checks to make sure the program should be allowed to read from that tape drive. After issuing or denying the requested commands, MVS returns control to the application program in problem program state.

IBM has provided several ways for application programs to obtain supervisor state: While these methods are provided by IBM, each installation must provide appropriate controls over their use.

PARMLIB or the parmlibs, there can now be more than one in usechange control and access control over this dataset are important parts of an effective security program. Ideally, such routines should use the same sort of logic as IBM's supervisor calls, making sure that the program issuing the supervisor call instruction should be permitted to do so.

For example, the supervisor call to open a file contains checks to make sure that the requesting program is authorized to open that specific file. When a program tries to write to a given memory location, the hardware compares that location's protect key to the current protect key, a counter representing the protect key of the program which is currently executing.

If the current protect key matches the protect key of the memory location, or if the current protect key is 0, then the access is allowed.

#1) Default Permit

Otherwise the hardware prevents access. When the current protect key is 0, the executing program can access any memory location, regardless of its protect key.

MVS generally reserves protect key 0 for itself. Once your program has supervisor state, it can give itself protect key 0; once it has protect key 0, it can give itself supervisor state.

Thus, instructions to change the current protect key, or to change the protect key for a given memory location, are all privileged. To execute them then requires supervisor state.About the Program Due to the increasing complexity of computer transactions and society's increasing dependence on eCommerce, as well as the proliferation of computing devices, the computer security field has become a high profile and rapidly growing, industry.

Computer security, cybersecurity or information technology security (IT security) is the protection of computer systems from theft or damage to their hardware, software or electronic data, as well as from disruption or misdirection of the services they provide..

The field is growing in importance due to increasing reliance on computer systems, the Internet and wireless networks such as. Your Social Security number, credit card numbers, and bank and utility account numbers can be used to steal your money or open new accounts in your name.

So every time you are asked for your personal information – whether in a web form, an email, a text, or a phone message – think about why someone needs it and whether you can really trust.

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