Sunday, 31 August 2014

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Saturday, 30 August 2014

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Tuesday, 26 August 2014

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Monday, 25 August 2014

What are antivirus programs? What are they ment for?

An anti-virus computer code program may be a computer virus that may be accustomed scan files to spot and eliminate pc viruses and alternative malicious computer code (malware).

Anti-virus computer code usually uses 2 completely different techniques to accomplish this:

Examining files to appear for celebrated viruses by suggests that of a pestilence lexicon
Identifying suspicious behavior from any computer virus which could indicate infection
Most industrial anti-virus computer code uses each of those approaches, with a stress on the virus lexicon approach.

Virus lexicon approach
In the virus lexicon approach, once the anti-virus computer code examines a file, it refers to a lexicon of celebrated viruses that are known by the author of the anti-virus computer code. If a bit of code within the file matches any virus known within the lexicon, then the anti-virus computer code will then either delete the file, quarantine it so the file is inaccessible to alternative programs and its virus is unable to unfold, or arrange to repair the file by removing the virus itself from the file.

To achieve success within the medium and long run, the virus lexicon approach needs periodic on-line downloads of updated virus lexicon entries. As new viruses area unit known "in the wild", civically minded and technically inclined users will send their infected files to the authors of anti-virus computer code, WHO then embody info concerning the new viruses in their dictionaries.

Dictionary-based anti-virus computer code usually examines files once the computer's software package creates, opens, and closes them; and once the files area unit e-mailed. during this means, a celebrated virus is detected at once upon receipt. The computer code may also usually be regular to look at all files on the user's disk on an everyday basis.

Although the lexicon approach is taken into account effective, virus authors have tried to remain a step earlier than such computer code by writing "polymorphic viruses", that cypher elements of themselves or otherwise modify themselves as a technique of disguise, thus on not match the virus's signature within the lexicon.

Suspicious behavior approach
The suspicious behavior approach, in contrast, does not arrange to establish celebrated viruses, however instead monitors the behavior of all programs. If one program tries to put in writing information to AN viable program, for instance, this can be flagged as suspicious behavior and therefore the user is alerted to the present, and asked what to try to to.

Unlike the lexicon approach, the suspicious behavior approach thus provides protection against new viruses that don't nonetheless exist in any virus dictionaries. However, it conjointly sounds an outsized range of false positives, and users in all probability become desensitized to any or all the warnings. If the user clicks "Accept" on each such warning, then the anti-virus computer code is clearly useless thereto user. This downside has particularly been created worse over the past seven years, since more nonmalicious program styles selected to change alternative .exes while not regards to the present false positive issue. Thus, newest opposed virus computer code uses this system less and fewer.

Other ways in which to find viruses
Some antivirus-software can try and emulate the start of the code of every new viable that's being dead before transferring management to the viable. If the program appears to be mistreatment self-modifying code or alternativewise seems as a pestilence (it immeadeatly tries to search out other executables), one might assume that the viable has been infected with a pestilence. However, this technique leads to plenty of false positives.

Yet another detection technique is employing a sandbox. A sandbox emulates the software package and runs the viable during this simulation. when the program has terminated, the sandbox is analysed for changes which could indicate a pestilence. due to performance problems this sort of detection is often solely performed throughout on-demand scans.

Issues of concern

Macro viruses, arguably the foremost harmful and widespread pc viruses, might be prevented much more inexpensively and effectively, and while not the necessity of all users to shop for anti-virus computer code, if Microsoft would fix security flaws in Microsoft Outlook and Microsoft workplace associated with the execution of downloaded code and to the flexibility of document macros to unfold and make disturbance.

User education is as vital as anti-virus software; merely coaching users in safe computing practices, like not downloading and execution unknown programs from the web, would slow the unfold of viruses, while not the necessity of anti-virus computer code.

Computer users shouldn't forever run with administrator access to their own machine. If they'd merely run in user mode then some varieties of viruses wouldn't be able to unfold.

The lexicon approach to police work viruses is commonly low owing to the continual creation of latest viruses, nonetheless the suspicious behavior approach is ineffective owing to the false positive problem; therefore, the present understanding of anti-virus computer code can ne'er conquer pc viruses.

There area unit varied ways of encrypting and packing malicious computer code which is able to create even well-known viruses undetectable to anti-virus computer code. police work these "camouflaged" viruses needs a robust unpacking engine, which may decode the files before examining them. sadly, several in style anti-virus programs don't have this and so area unit typically unable to find encrypted viruses.

Companies that sell anti-virus computer code appear to possess a monetary incentive for viruses to be written and to unfold, and for the general public to panic over the threat.

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Thursday, 21 August 2014

Wednesday, 20 August 2014

Monday, 18 August 2014

Friday, 15 August 2014

Friday, Friday!

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Thursday, 14 August 2014

Tuesday, 12 August 2014

Have a nice Tuesday!

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Sunday, 10 August 2014

Monday, 4 August 2014

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