KR20030019055A - Device for blocking access of adult or hurtful web sites - Google Patents

Abstract

PURPOSE: A device for blocking a connection to an injurious site is provided to prevent young boys and girls from connecting to a lewdness and injurious site through the Internet by blocking a connection when a web address which is set as a lewdness and injurious site is inputted by a computer user. CONSTITUTION: A basic blacklist examination unit(101) is provided for executing a comparison and a search with respect to a lewdness and injurious site. A basic blacklist memory unit(103) is compared with a web site address being inputted or linked by a user and stores a blacklist being used by the basic blacklist examination unit(101). If the user inputs or a links a web site address in a safety network driver installed in a computer through a web browser or an Internet related program, the inputted or linked web site address is detected. An operation state is checked through a data transmission/receipt between the safety network driver and the basic blacklist examination unit(101). If the operation state is normal, a connection function of an Internet web site is performed. The basic blacklist examination unit(101) compares an external web site requested by the user with a web site address on the blacklist stored in the basic blacklist memory unit(103), and a connection approval or not of the user-requested web site is decided.

Description

Device for blocking access of adult or hurtful web sites}

The present invention is installed on a computer in the form of a LAN card, ADSL, general modem or slot-mounted card or an intermediate data access device, and the web is set as a lewd or harmful site by the user while pre-stored the website address of the lewd or harmful site of the Internet. The present invention relates to a device for blocking access to a harmful site by forcibly blocking access to a website when a site address is input, thereby preventing a minor or an unauthorized user from accessing a lewd or harmful site through the Internet.

Despite the convenience of information retrieval and shopping due to the popularization of the Internet with the beginning of the information age, the youth's unrestricted access to websites such as sexually explicit sites, suicide sites, bomb-making sites, etc. It has a tremendous adverse effect on mental and physical development. The development of technology to block indiscriminate access of adolescents is being promoted, but it is still difficult to effectively block access to pornography and harmful sites of adolescents.

The following describes the blocking method of the obscene and harmful sites used in the prior art.

The first is to install a program that can block indecent or harmful sites on a personal computer equipped with the Internet or a network communication function. In other words, the web access is blocked by rejecting the reception of a web page including a specific character in the content of the web page transmitted through the Internet. Specific characters are words that are set by the program installer and can be profanity, obscene, or characters for a particular subject.

Another access blocking method using the program is to register the website address of the obscene or harmful site in the program, when the user enters the website address to access the website, it detects this and refuses to access the website. To block access to harmful sites.

While this method has the advantage of being simply installed on a personal computer, it is easily removed by deleting a program. In particular, parents who are unfamiliar with the operation of the computer are often useless due to the difficulty of installation and management, so there was no significant effect on blocking obscene and harmful sites. Moreover, in case of directly inputting the address of the website, it is impossible to directly search the addresses of the website which is changed at every moment, which causes a problem of ineffectiveness.

The second method is to install a proxy server on the server of the Internet service provider (ISP) that provides the Internet service, and block obscene or harmful sites on the proxy server. That is, if a proxy server includes a website address (URL) filtering means and a user connected to the proxy server attempts to access a website registered as a lewd or harmful site, the proxy server is blocked. In particular, ISPs are able to inject the necessary personnel to investigate pornographic and harmful sites, so that they can be searched and renewed at regular intervals and search and update the website address of harmful websites. There is this.

However, by changing the Internet settings, this method can be avoided by accessing sexually explicit or harmful sites without going through a proxy server. In the case of large ISPs, Internet users can access all the users from tens to millions. Since it is necessary to determine whether or not to allow the proxy server, a heavy load is often caused by the server downtime, thereby increasing the user complaints. This problem has been a hindrance to effective Internet use because it impedes access to healthy and informative websites.

Thirdly, the conventional program-implemented function is implemented by a slot-type removable card of a hardware type. This is a method of blocking harmful sites by comparing the list and the harmful sites listed in the list with the websites that the user wants to access, if they are determined to be harmful sites. This approach has the disadvantage that it can be simply disabled by removing hardware. In addition, there is a problem that it is difficult to effectively block the harmful site because the real-time update of the harmful site with a lot of change is difficult.

The present invention is to solve the above problems, an object of the present invention is to block access when the website address set as a lewd, harmful site by a computer user to access the lewd, harmful site through the Internet It is to provide a device for blocking access to harmful sites that can be blocked.

Another object of the present invention consists of a management program such as hardware installed in a computer-mounted card such as a LAN card, ADSL, modem or hardware lock key and a driver installed in the computer, the interaction between the hardware unit and the management program If it operates normally, it blocks the indecent or harmful site, and if any component of hardware or management program is removed or disabled, it blocks the Internet communication function. To provide.

Another object of the present invention is to provide a device for blocking access to a harmful site, which can always provide up-to-date information by periodically updating a website address for an obscene and harmful site.

Still another object of the present invention is to display the operation state of the access blocking device of the harmful site on the monitor screen of the computer so that the operation state of the connection blocking device can be easily checked, so that parents can reliably restrict the use of the Internet by minors. The present invention provides a device for blocking access to a harmful site.

1 is a block circuit diagram of a LAN card equipped with a device for connection blocking of the present invention;

2 is a flowchart showing an operating state of the apparatus for block connection of the present invention,

3 is a conceptual diagram of a website access blocking state in a LAN card according to the present invention;

4 is a conceptual diagram of a website access blocking state in an ADSL card according to the present invention;

5 is a conceptual diagram of the blacklist update according to the present invention;

Figure 6 is an embodiment of the icon display showing the operating state of the connection blocking device of the present invention,

Figure 7 is an embodiment showing a connection rejection state of the connection blocking device of the present invention,

Figure 8 is an embodiment showing a password input and change state of the present invention,

9 to 10 is a modified embodiment of the connection blocking device of the present invention,

11 is a block diagram of a contact blocking device according to another embodiment of the present invention;

12 is a schematic block diagram of a client and a server according to the present invention;

※ Explanation of symbols about main part of drawing ※

1,1a: LAN card 2: ADSL card

3: slotted card 5: connection blocking key

5a: terminal 7: slot

9: usb port 9a: terminal

10: Interrupter 12: Boot EPROM

14: Packet Buffer 16: CFG EEPROM

18: Dedicated Chip 20: UTP / AUI Interface

22: LAN card internal bus 24: PC internal bus

26: Operation indicator icon 30: Blacklist server

101: basic blacklist inspection section 103: basic blacklist memory section

105: external blacklist memory section

Device for blocking access to harmful sites of the present invention for achieving the above object, the basic blacklist inspection unit 101 for performing comparison, search for harmful, pornographic sites, and the website address input or linked by the user Comparing with the basic blacklist memory unit 103 for storing the blacklist used by the basic blacklist inspection unit 101, in the safety network driver installed in the computer, the user can browse the web browser or Internet related programs When the web site address is input or linked through the web site address, it is detected and the safety network driver and the basic blacklist inspection unit 101 check the operation state through the data transmission and reception, and the normal operation state is only confirmed when the Internet website access function. Performing the, and the basic blacklist check unit 101 Comparing the address of the website on the black list stored in the black list memory unit 103, and is characterized in that for determining whether or not to allow connection of an external website requested by the user.

According to another embodiment of the present invention, a safety LAN card (1a) including an adult authentication check unit 112 for authenticating the adult to stop the blocking of the existing data transmission module and harmful site, and TCP / IP trans Safe LAN card URL filter 114 that includes a module for monitoring the port layer to detect the transmitted data to block harmful sites and a module for exchanging data with the client manager 115 and the safety LAN card driver 113 and In addition, the black URL list 116 storing the harmful site information and the harmful site list (URL) from the secure LAN card server 30 are transmitted to receive data and download necessary programs, and also the secure LAN card URL filter 114. Secure LAN card client manager 115 including a module for exchanging data with the secure LAN card driver 113, and the security LAN card to prevent hacking security It characterized in that it comprises a security network card driver 113 is provided by an adult authentication module key reading modyulga.

Hereinafter, an apparatus for blocking access to a harmful site of the present invention will be described in detail with reference to the accompanying drawings.

A device for blocking access to a harmful site of the present invention is to solve the disadvantage of blocking a website in a conventional program form or a proxy server, and includes a LAN card, an ADSL card, a cable modem, a telephone modem, or a slot mounted on each individual computer. It is installed in a data path that can transmit and receive data with a computer, such as a mounted card or a connection blocking key, so that it can effectively block obscene or harmful sites.

1 is a block diagram of a LAN card 1 in which an apparatus for blocking access of a harmful site is installed, as an embodiment of the present invention. The ordinary LAN card 1 includes a boot EPROM 12, a packet buffer 14, a CFG EEPROM 16, a dedicated chip 18, and a UTP / AUI interface 20. The LAN card 1 is a device (NIC) for connecting a plurality of computers located in a small area to a network, and is generally connected to a hub (not shown), and the hub is connected to an ISP server through a modem or the like to connect to the Internet. Perform communication. As described above, the LAN card 1 is a key device for transmitting and receiving data through the Internet or a network, and thus, the LAN card 1 detects a data transmission state from each computer on which the LAN card is installed, thereby blocking the Internet connection state.

In a normal operating state, the LAN card 1 performs a function of transmitting data of a web browser executed on a user computer. When a request for data transmission occurs in a user's personal computer, this information is made into a certain form and sent to the LAN card 1. The LAN card 1 stores this information in the packet buffer 14 and then transmits the information in a form suitable for a network or the Internet (for example, a serial method). At this time, a network driver is used to intervene between the PC and the LAN card 1 to process data. The network driver is a kind of software, and is in charge of controlling necessary devices through data exchange with an OS installed in a computer.

Reference numeral 12 is a boot EPROM, 16 is a CFG EEPROM, 18 is a dedicated chip of a LAN card manufacturer, and 20 is a UTP / AUI interface device for the basic functions of the LAN card 1. In addition, 22 is an internal bus of the LAN card, 24 is an internal bus of the PC, such a structure and function are known, so detailed description thereof will be omitted.

In the present invention, a separate connection blocking network driver is installed in a user's computer, and connection blocking is performed by exchanging data with a conventional network driver. Such a connection blocking network driver (hereinafter referred to as "safe network driver") can be installed and operated on a hard disk of a computer at the time of installation of the connection blocking device of a harmful site of the present invention. In order to perform data exchange function with the network driver for LAN card, the safety network driver must be set in advance for data exchange with the protocol built in LAN card, ADSL card, or modem. The operating status of the safety network driver is described later.

According to the present invention, the connection blocking device 10 is further provided in the conventional LAN card 1 having the above configuration. The connection blocking device 10 is connected to the internal bus 22 of the LAN card, and is connected to the PC internal bus 24 to thereby transmit and receive data. The access blocking device 10 is provided with a "safe network driver" that is pre-installed on a computer by a website address entered by a user in an address field of a web browser or a website address which is called by clicking a link included in a web page or an Internet related program. It is judged whether or not harmful by comparing the website address (hereinafter referred to as "blacklist") designated as obscene and harmful site by input through.

In order to determine whether or not harmful to the contact blocking device 10 to store the blacklist and the basic blacklist inspection unit 101 for performing a function for comparing the website address input by the user and the pre-stored blacklist The basic blacklist memory unit 103 is provided. This applies not only to the LAN card but also to the ADSL card 2, the slotted card 3, and the connection blocking key 5 illustrated in Figs. 4, 9 and 10.

The blacklist also downloads and stores updated blacklists periodically or from time to time from the blacklist server 30 located at a remote location. In order to store the downloaded file, the basic blacklist memory unit 103 may be configured using a memory such as a flash memory capable of reading and writing. Alternatively, the basic blacklist memory unit 103 may be set with an initial obscene and harmful website address, and the newly updated website address may be updated using a hard disk or a separate memory unit.

The present invention also includes various countermeasures for preventing a minor user from disabling the safety network driver or the connection blocking device 10. That is, when the user uses the computer, when the power is turned on, the connection blocking device 10 is detected to operate normally and an icon indicating the normal operation state of the connection blocking device 10 is displayed on the monitor screen of the computer. Can be. By doing so, the parent or adult has the advantage of being able to check the current operating state of the access blocking device (10).

Referring to FIG. 6, it can be seen that a shaped icon 26 is displayed on the upper side of the monitor screen. The icon 26 is programmed to be displayed after it is confirmed that the connection blocking device 10 and the safety network driver of the present invention operate normally. It is apparent that other types of icons may be used instead of the molding icons, and the display position may be changed to another place on the monitor screen.

In addition, when the parent or the administrator goes out and cannot monitor, the connection blocking device 10 detects the operation of the "safe network driver" or the reverse thereof, and if the operation is not confirmed to each other, transmission and reception of all network data You can block access to Internet sites by blocking them. In this way, the safety network driver and the access blocking device 10 must be correctly operated to allow the Internet communication function to block pornography and harmful site access of minors or teenagers.

The device for blocking access to harmful sites according to the present invention may be configured as a slot card (3) mounted in a conventional computer slot (7) as well as a LAN card and an ADSL card.

9, the connection blocking device 10, that is, the basic blacklist inspection unit 101 and the basic blacklist on the surface of the slot-mounted card 3 inserted into the slot 7 of the computer in which the conventional expansion card is installed. The memory unit 103 is configured to be mounted. The operating states of the basic blacklist checking unit 101 and the basic blacklist memory unit 103 are the same as described above, which is that the connection blocking device 10 is mounted on the LAN card 1 in FIG. Compared with the blocking device 10 mounted on the ADSL card 2, there is a difference that the independent card is configured, and there is an advantage of easy manufacturing.

10 shows another application example of the type mounted on the USB port 9. In other words, as a connection blocking key 5 having a separate terminal 5a so that data can be transmitted through the USB port 9, a connection blocking device 10 is provided inside the connection blocking key 5. have. Since the operation state of the connection blocking key 5 is the same as those described above, a detailed description thereof will be omitted. The connection blocking key 5 can be applied to not only a USB port but also a normal parallel port. At this time, it is important that the same terminal 5a as the terminal 9a of the USB port 9 is provided to enable normal transmission and reception of data through the USB port or the parallel port to which the connection blocking key 5 is connected. In the slot-mounted card 3 and the connection blocking key 5, the installation and operation of the safety network driver are the same.

Hereinafter, a contact blocking state of a device for blocking access of a harmful site of the present invention will be described with reference to FIG. 2. This applies to all embodiments according to the present invention, for example, LAN card 1, ADSL card 2, slotted card 3 and / or connection blocking key 5.

When a user runs a web browser or an Internet related program on a computer, the safety network driver is detected and the function of the access blocking device 10 is activated. After that, when a user requests access to an Internet access service, for example, a specific website using a web browser or a related program, the safety network driver detects the website address. When the connection blocking device 10 is activated, an icon 26 indicating an operation state is output on the monitor screen as shown in FIG. 6 to indicate that the obscene or harmful site is being blocked.

Thereafter, the present invention searches for the input of the decryption command for temporarily releasing the blocking function of the access blocking device 10 so that an adult user or an administrator can access. In other words, it is a function to allow access to all websites by temporarily shutting down the connection blocking device 10. This is when the user presses a specific function key or combination of function keys, for example "Alt + Shif + F9" or "Alt + Ctrl + F10", the password entry screen is displayed. Release the connection blocking function to allow the connection freely. 8 illustrates an embodiment of a screen displaying a password input and confirmation message.

The specific key combination for changing the password should be delivered only to the adult user or the administrator, and it is preferable to prevent the minor user from recognizing the password input function because the password input function is not displayed on the normal menu screen. When the access blocking function is released by the password input, the safety network driver transmits the website address directly to the control unit of the LAN card 1 without transmitting the website address to the basic blacklist checking unit 101. Therefore, the internet card can be accessed without restriction through the LAN card 1.

If there is no cancellation of function restriction by password input, normal website blocking function is performed. 3 or 4, the website address detected by the safety network driver is stored in the basic blacklist memory unit 103 by the basic blacklist checking unit 101 of the access blocking device 10. Compared to a list and judged. As a result of the comparison, if the requested website address is not included in the blacklist, the safe network driver allows access to the website normally. At this time, the safety network driver handles access to the website through data transmission and reception with network drivers such as LAN cards, ADSL cards, and modems already installed in the computer.

Accordingly, if it is determined that the website is not a lewd or harmful website, the dedicated chip 18 of the LAN card 1 or the ADSL card 2 requests data from the corresponding URL, and stores the transmitted data packet on the user's computer hard disk. Display on the monitor screen. If it turns out to be a dirty site, it outputs a message as shown in Fig. 7 and blocks the access of the website.

Since the contents of the blacklist stored in the basic blacklist memory unit 103 do not effectively update the website address of the obscene or harmful site that changes every moment, the blacklist server 30 can be used to download and compare the newly set blacklist. Can be. That is, after the blacklist is downloaded, the blacklist is stored in the basic blacklist memory unit 103 or the hard disk of the computer, and then compared with the updated blacklist. In comparison with the updated blacklist, if it is found that it is a lewd or harmful site, it indicates that it is a harmful site and blocks access. If it is not included in the blacklist, data transmission and reception is allowed to the basic LAN module of the LAN card 1.

In the update of the blacklist, referring to FIG. 5, which is a conceptual diagram, after confirming that the network is connected to the Internet, the safety network driver requests the blacklist to the blacklist server 30 located at a remote place when the first network service request is made. The blacklist server 30 transmits a blacklist newly input to the computer when a request for transmitting the blacklist is input from a specific computer.

The transmitted blacklist is saved after being detected by the safety network driver. The blacklist may be stored in a file format on the basic blacklist memory unit 103 of the connection blocking device 10 or a hard disk of a computer. Alternatively, the external blacklist memory unit 105 may be stored separately from the basic blacklist memory unit 103. The external blacklist memory unit 105 may also be configured using a memory device capable of reading and writing data, for example, a flash memory.

In the case of storing the blacklist on the hard disk, it is also possible to set a password in the blacklist file to prevent the user from changing the data. Alternatively, if the blacklist file is stored after the blacklist file has been tampered with, the safe network driver detects this and blocks the Internet access function. The blacklist update is preferably performed every time the computer is powered on and requests the first network access service.

Although the basic blacklist checking unit 101 and the basic blacklist memory unit 103 described in the present invention are composed of respective functional blocks, it is possible to manufacture in the form of one IC chip, and in the case of manufacturing in the form of a chip. It can be simply added to the LAN card, ADSL card, modem, slotted card, or access key without changing the circuit.

11 to 12 illustrate another embodiment (second embodiment) according to the present invention. In this embodiment, when the (management) driver program is removed for fraudulent use, the function of the LAN card is basically blocked (or vice versa) similar to that described in FIG. 1, but the features are further refined. And adult authentication functions. This is particularly implemented by installing hardware, drivers, and the like for the conventionally used LAN card.

Referring to FIG. 11, the access blocking device of the present invention includes a safety LAN card 1a including an adult authentication checker 112 for authenticating an adult in order to stop blocking an existing data transmission module and a harmful site. And a safety LAN card including a module for monitoring a TCP / IP transport layer and detecting a transmitted data to block harmful sites and a module for exchanging data with the client manager 115 and the safety LAN card driver 113. Download data and necessary programs to update the URL filter 114, the black URL list 116 storing the harmful site information, and the harmful site list (URL) from the secure LAN card server 30. Security LAN card client manager 115 including a filter 114 and a module for exchanging data with the safety LAN card driver 113, and control the safety LAN card to prevent hacking It includes a safety network card driver 113 includes a security module and adult authentication key read modyulga.

The safety LAN card 1a is loaded with a basic LAN module for performing basic functions. This is configured to perform a function similar to that of the conventional LAN card. In addition, an adult authentication check unit 112 is connected to the safety LAN card (1a). The adult authentication check unit 112 is separated from the LAN card (1a) is connected by a cable or the like and is installed on the front of the PC.

Adult authentication check unit 112 is to determine whether to block the harmful site when connecting to the website, for example, if the adult key (adult key) for authentication is inserted into the harmful site blocking function without any restrictions Allow the connection. If it is separated for fraudulent use, since the function of the LAN card 1a is configured to not work, it is configured to be fraudulent unless the adult authentication checker 112 is removed.

The driver 113 for a safety LAN card (SLC) is a device driver for Windows, and is usually implemented programmatically and installed in a PC. In addition to the conventional device driver function, the present invention further includes functions such as an adult authentication test by detecting an insertion state of security, an adult key, and the like according to the present invention.

In other words, the safety LAN card driver 113 monitors the operation state of the safety LAN card URL filter 114, and if it is determined that the filter implementation program does not work or is hacked, the LAN card data transmission function is essentially blocked. To prevent fraudulent use.

In addition, the safety LAN card driver 113 performs an adult authentication function to stop the harmful site blocking function for the adult user. That is, when the user inserts the adult key into the adult authentication checker 112 and requests adult authentication, the user detects this and performs adult authentication. The adult key for adult certification is provided at the same time as the product is purchased.

The black URL list 116 stores information on a harmful site, and may receive a newly updated list online from the secure LAN card server 30 and may be stored in a file format on a hard disk. By storing the file in the form of a file on the hard disk, the list can be easily updated. At this time, the secure LAN card client manager 115 manages the black URL list 116 in order to detect or prevent deformation from the outside for illegal use.

The secure LAN card URL filter 113 detects URL information included in the data transmitted from the TCP / IP transport layer, determines whether the harmful site is harmful, and blocks the harmful site. In other words, by determining whether a harmful site or not to exchange data between the client manager 115 and the safety LAN card driver 113 to perform a harmful site blocking function.

The client manager 115 periodically requests data transmission to the secure LAN card server manager 302 of the server 30 to check a list of newly registered, modified and deleted URLs. In addition, when the black URL list 116 is inadvertently or intentionally deleted by the user, the safety LAN card 1a may be stopped so that the network is stopped. The user must install or receive the data from the server 30 by reinstalling the URL file or rebooting the CD.

Referring to the operating state of the connection blocking device of the present invention having the above configuration as follows.

When a user runs a web browser such as Internet Explorer and enters a specific URL while requesting access to the Internet, before the data is transferred from the Windows serviec layer to the safety LAN card driver 113, First, the secure LAN card URL filter 114 is to check the URL and IP to access. The inspection process detects the harmful URL by searching the detected URL and IP from the black URL list 116 stored in the form of a file on the hard disk. In fact, this comparison process can be compared and judged very quickly using a database engine.

If it is not a harmful site, the safety LAN card 1a is controlled so that data is transmitted normally. If it is determined that the harmful site, it is determined whether the user is an adult or not.

In the adult authentication, if the adult key is inserted into the adult authentication checker 112, the adult key is judged to be an adult and data transmission / reception processing for the website requested by the safety LAN card driver 113 is performed without the filtering step. However, if the adult key is not inserted, the filtering step is performed.

The update on the harmful site is updated by storing a file transmitted from the secure LAN card server 30. In other words, the server 30 collects and stores information about a harmful website using the safety LAN card robot 305 and stores the URL list from a client of the safety LAN card client manager 115 on the client side. The list is sent. The secure LAN card sub manager 302 transmits the stored URL list to the corresponding client when a request comes.

The system security state according to the present invention will be described with reference to FIG.

In the present invention, it is configured to check the security state by checking the operating state of each other, it is configured to block the entire data transmission if it is determined that any one of the operation instability or hacking.

The safety LAN card driver 113 periodically checks whether the client manager 115 operates normally. If the client manager 115 does not operate normally, the safety LAN card driver 113 notifies the user and stops the network function to block access to the harmful site.

In addition, the client manager 115 periodically checks check sums of the files in the black URL list 116 and compares them with the URL information of the server 30. If the black URL list 116 file is damaged or hacked, it is immediately delivered to the user and the normal file is reinstalled. Re-installation is performed via CD or the Internet and allows the user to choose.

In addition, the secure LAN card client manager 115 periodically checks whether the secure LAN card URL filter 114 is normally executed and notifies the user if it is not normally executed. The notification method when not normally executed can be executed by displaying a specific symbol such as an icon on the monitor screen of a PC or by outputting a specific sentence such as "the current Internet filter is not operating normally." This can be done not only with the filter but also with the LAN card removed.

According to the present invention, when a web site address set as a lewd or harmful site is input by a computer user, the teenager can block access to a lewd or harmful site through the Internet.

In addition, it is difficult to remove the LAN card, ADSL modem, cable modem, or a general-purpose telephone modem that is mounted on a computer and used to transmit data.

In addition, by periodically updating the website address for pornographic and harmful sites, the latest information can be provided at all times, and the operation status of the connection blocking device can be easily checked by displaying the operation status of the connection blocking device on the monitor screen of the computer. This allows parents to reliably limit minors' use of the Internet.

Moreover, when adults want to use, there is an advantage that can be used freely by releasing the blocking function of harmful sites through adult authentication.

Claims (9)

The blacklist used by the basic blacklist checking unit 101 as compared with the basic blacklist checking unit 101 for conducting a comparison and search for harmful and pornographic sites and a website address inputted or linked by a user. It includes a basic black list memory unit 103 for storing a, and detects this when a user enters or links a website address through a web browser or an Internet-related program in a safety network driver installed in the computer, and the safety network driver and The basic blacklist checking unit 101 performs an access function of the Internet website only after confirming the operating state through data transmission and reception between the basic blacklist checking unit 101 and the normal operating state, and the basic blacklist memory in the basic blacklist checking unit 101. The website address on the blacklist stored in section 103 and T to the device for access blocking the harmful sites, characterized in that for determining whether or not to allow connection of an external website requested by the user. The method of claim 1, The harmful site access blocking device outputs an icon (26) indicating a normal operation state on a monitor screen when a website access service is requested. The method of claim 1, Since the device for blocking access to the harmful site is set with a specific function key for setting a password, when the specific function key is input, a password input screen is output, and when a valid password is input, the website blocking function is not performed. Blocking access of harmful sites. The method of claim 1, The device for blocking access of the harmful site downloads the updated blacklist from the blacklist server 30 and stores the updated blacklist on the computer's hard disk or external blacklist memory 105. Device for blocking access to harmful sites, characterized in that for performing a search with reference to the black list. The method of claim 1, And the basic black list checking unit (101) and the basic black list memory unit (103) are mounted on a LAN card, an ADSL modem, a telephone line modem, or a cable modem. The method of claim 1, The basic black list inspection unit (101) and the basic black list memory unit (103) is a device for blocking access to harmful sites, characterized in that installed in the slot-mounted card (5) mounted in the slot. The method of claim 1, And the basic black list checking unit (101) and the basic black list memory unit (103) are installed in a contact blocking key (7) mounted on a parallel port or a USB port. In order to stop the blocking of the data transmission module and the harmful site, the safety LAN card 1a including an adult authentication checker 112 for authenticating an adult, and the data transmitted while monitoring the TCP / IP transport layer The safety LAN card URL filter 114 including a function for detecting and blocking harmful sites and a module for exchanging data with the client manager 115 and the safety LAN card driver 113, and a black URL list for storing the harmful site information. 116, data is transmitted to update the harmful site list (URL) from the safety LAN card server 30, and a necessary program is downloaded, and data is exchanged with the safety LAN card URL filter 114 and the safety LAN card driver 113. Safety LAN card client manager 115 including a module to control the safety LAN card, and the security module for preventing hacking and adult authentication key reading module is provided with Device for access blocking the harmful sites comprising the network card driver 113. The method of claim 8, The safety LAN card driver 113 periodically checks whether the client manager 115 is operating normally. If not, the safety LAN card driver 113 notifies the user and stops the network function to block access to a harmful site. The client manager 115 periodically checks check sums of the files of the black URL list 116 and compares them with the URL information of the server 30, and if the black URL list 116 file is damaged or hacked, Promptly forward to the user and reinstall the normal file, The secure LAN card client manager (115) periodically checks whether the secure LAN card URL filter (114) is running normally, and if not normally notified to the user and automatically re-executing device for the harmful site, characterized in that.