How Do I Choose the Best Free Computer Security Software?

Security software is divided into anti-virus software, system tools and anti-rogue software.

Security software is a program tool that can remove all program code known to be harmful to your computer, such as viruses and Trojans. Security software is also a software program that assists you in managing your computer's security. The quality of the security software determines the quality of the antivirus. The antivirus software that passed VB100 and Microsoft Windows authentication is the best choice in the field of security software. ^[1]

Chinese name: Security software
Foreign name: security software

Complex: Security software
Types of: application
Pinyin: n quán run jiàn

Software Principles of Security Software

Principles of anti-virus software in security software

The task of anti-virus software is to monitor and scan disks in real time. Some anti-virus software enters the system by adding drivers to the system and starts with the operating system. Most antivirus software also has a firewall function.

The way real-time monitoring of anti-virus software differs from software to software. Some anti-virus software divides a part of the space in the memory and compares the data flowing through the computer's memory with the signature code of the virus database (including virus definitions) carried by the anti-virus software to determine whether it is a virus. Other anti-virus software executes programs submitted by the system or users in the allocated memory space to make judgments based on their behavior or results.

The method of scanning the disk is the same as the first method of real-time monitoring mentioned above, but here, the anti-virus software will do all the files on the disk (or the files within the user-defined scanning range). Check once.

Security Software Software Technology

Recognition mark Anti-virus software technology in security software

Shelling technology is a technology for analyzing and checking compressed files and packaged files.

Self-protection technology to prevent virus programs from killing their own processes.

Repair technology, technology for repairing files damaged by viruses.

Active real-time upgrade technology was first proposed by Kingsoft Internet Security. Every time the Internet is connected, the anti-virus software will automatically connect to the upgrade server to query the upgrade information. If necessary, upgrade

Active defense technology is the automatic monitoring of various program actions through dynamic simulation of an anti-virus expert system, the automatic analysis of the logical relationships between program actions, the comprehensive application of virus recognition rule knowledge, and the automatic determination of new viruses to achieve the purpose of active defense.

Security software software common sense

Anti-virus software in security software cannot kill all viruses;

Viruses found by anti-virus software may not be able to kill them;

Two or more sets of anti-virus software cannot be installed at the same time under each operating system of a computer (unless they are compatible, some of the anti-virus software produced by the company);

There are multiple ways for antivirus software to disinfect infected files: 1 clean, 2 delete, 3 rename, 4 forbidden to access, 5 do not process (skip) (cannot be cleared using multiple methods or user selection), etc.

In short, the key point to remember: any antivirus software lags behind computer viruses forever! Therefore, in addition to updating the software version and scanning regularly, you should also pay attention to enriching your computer security and network security knowledge, so as not to open unfamiliar files or unsafe web pages at random, do not browse unhealthy sites, and pay attention to updating yourself Privacy passwords and more. In this way, we can better maintain our computer and network security!

Security software needs improvement

Areas for improvement of anti-virus software in security software :

Various virus ratios Smarter identification of unknown viruses to better discover unknown viruses;

The virus can be quickly and completely removed when a virus is found;

Enhanced self-protection function. Even though most anti-virus software has self-protection function, there are still viruses that can block their processes, causing them to be paralyzed and unable to protect the computer.

Lower system resource occupation. Many anti-virus software require a large amount of system resources such as memory resources and CPU resources. Although the security of the system is guaranteed, the system speed is reduced.

Security Software Cloud Security Technology

"Cloud Security" plan

Cloud security technology It is the latest manifestation of information security in the network age. It integrates emerging technologies and concepts such as parallel processing, grid computing, and judgment of unknown virus behaviors. Through a large number of clients on the network, abnormal monitoring of software behaviors on the network is obtained. The latest information of the malicious program is pushed to the server for automatic analysis and processing, and then the virus and Trojan solutions are distributed to each client. Antivirus software will not be able to effectively handle an increasing number of malicious programs in the future. The main threat from the Internet is shifting from computer viruses to malicious programs and Trojans. In such cases, the signature database discrimination method is obviously outdated. After the application of cloud security technology, identifying and killing viruses no longer only rely on the virus database on the local hard disk, but instead rely on huge network services for real-time collection, analysis, and processing. The entire Internet is a huge "anti-virus software". The more participants there are, the more secure each participant is, and the more secure the entire Internet is. The concept of cloud security has caused widespread controversy, and many people consider it a false proposition. But the facts speak louder than words. The development of cloud security is like a gust of wind. Baidu Antivirus, Tencent Computer Butler, Rising, Trends, Kaspersky, MCAFEE, SYMANTEC, Jiangmin Technology, PANDA, Kingsoft, 360 Security Guard, Kaka Internet Security Assistant, etc. Both have launched cloud security solutions.

In 2013, Tencent Computer Manager realized the cloud identification function. In QQ2013beta2, it opened a shared channel with Tencent Computer Manager on the malicious URL signature database. Every URL transmitted in QQ chat will be in the malicious URL database in the cloud. Perform verification and immediately return the authentication result to the chat window. Relying on Tencent's huge product ecological chain and user base, Tencent Computer Butler has established the world's largest database of malicious URLs and updated it in real time through a cloud reporting platform. It is already a global leader in anti-fraud and anti-phishing fields, so Realize more accurate URL security detection in the QQ platform to prevent users from losing property or account caused by accidentally accessing malicious URLs. ^[2] Rising 2009's new product based on cloud security strategy intercepts millions of Trojan horse attacks every day, including 7.65 million times on January 8. Trend Micro Cloud Security has established 5 data centers and tens of thousands of online servers worldwide. It is reported that Cloud Security can support an average of 5.5 billion click queries per day, and collect and analyze 250 million samples per day, and the database's first hit rate can reach 99%. With cloud security, Trend Micro now blocks up to 10 million virus infections per day. Cloud security technology is the result of the mixed development and natural evolution of distributed computing technologies such as P2P technology, grid technology, and cloud computing technology. It is worth mentioning that the core idea of cloud security is very close to the anti-spam grid proposed by Liu Peng in 2003. At the time, Liu Peng believed that the flood of spam could not be filtered automatically by technical means because the artificial intelligence method that it relied on was not mature technology. The biggest feature of spam is that it sends the same content to millions of recipients. To this end, a distributed statistics and learning platform can be established to filter spam emails with collaborative computing by large-scale users: First, users install a client to calculate a unique "fingerprint" for each email received. The "fingerprint" comparison can count the number of copies of similar emails. When the number of copies reaches a certain number, it can be judged that the email is spam. Second, because multiple computers on the Internet have more information than one computer, it can be distributed. Bayesian learning algorithms implement collaborative learning processes on hundreds or thousands of client machines to collect, analyze, and share the latest information. The anti-spam grid reflects the true grid idea. Each user who joins the system is not only a service object, but also an information node that completes the distributed statistical function. With the continuous expansion of the system scale, the accuracy of the system's filtering spam It will increase with it. The method of filtering spam by large-scale statistical methods is more mature than the method using artificial intelligence, and it is not easy to misjudge false positives, and it is very practical. The anti-spam grid is to use the collaborative work of millions of hosts in the distributed Internet to build a "Skynet" that blocks spam. After the idea of anti-spam grid was put forward, it was selected as an outstanding grid project by the IEEE Cluster 2003 International Conference and gave a live demonstration in Hong Kong. A special report and live demonstration were given at the 2004 International Grid Computing Symposium, which caused a wide range of Attention has attracted the attention of Ding Lei, founder of NetEase, China's largest mail service provider. Now that spam can be handled this way, so are viruses, Trojans, etc. This is not far from the idea of cloud security.

Security software software classification

Security Software Antivirus

Also called anti-virus software. For example, G Data (Germany), Tencent Computer Manager, Baidu Anti-Virus, Kaspersky Security Forces, Little Red Umbrella, Rising Anti-Virus Software, Kingsoft Internet Security, Microsoft Security Essentials, Norton, 360 Anti-Virus

Security software assisted security software

It is mainly software for cleaning up garbage, fixing vulnerabilities, and anti-trojan horses, such as Baidu Guardian, Jinshan Guardian, Rising Security Assistant, Tencent Computer Manager, 360 Security Guardian, and so on.

Anti-Rogue Software

It mainly cleans rogue software and protects system security functions, such as Baidu Guardian, Malware Cleanup Assistant, Super Rabbit, Windows Cleanup Assistant and so on.

Security software encryption software

The main purpose is to protect the information assets by encrypting the data files to prevent leakage. Encryption software can be divided into passive encryption and active encryption according to the implementation method. At present, the transparent encryption technology of the driver layer on the market has become the most reliable and secure encryption technology, and the representative is Guangdong Southern Information Security Industry Base.

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