CN1322424C - Virus proof tech. for computer - Google Patents
Virus proof tech. for computer Download PDFInfo
- Publication number
- CN1322424C CN1322424C CNB941194116A CN94119411A CN1322424C CN 1322424 C CN1322424 C CN 1322424C CN B941194116 A CNB941194116 A CN B941194116A CN 94119411 A CN94119411 A CN 94119411A CN 1322424 C CN1322424 C CN 1322424C
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- hard disk
- safety
- tri
- place
- antivirus
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Abstract
The present invention belongs to the computer technical field of a virus preventing technique for a computer. The present invention comprises an antivirus card and a key flexible disk corresponding to the antivirus card, wherein the antivirus card comprises a decoder and a tristate switch. The working process comprises the step that a logic circuit is used for decoding a command that a computer access virus infringes a hard disk. The key disk has the function of leading a user for safe operation. Compared with the prior art, the present invention solves the problems of a safe area is intruded by viruses, and normal entitlements of an operating system is illegally restrained in principle. The present invention also has the advantages of small volume of the antivirus card, few components and simple operation.
Description
The computer virus-resisting technique that the present invention relates to belongs to field of computer technology.
For Prevention and Cure of Computer Virus, based on " controlling ", mainly be various sterilization softwares, its meaning is that it is to remedy for a kind of of the object that suffers virus infraction.Its fatal shortcoming is passive.Based on " preventing ", mainly be some immunological softwares and some antitoxin cards.Its meaning is that they have increased the difficulty of poisoning intrusion to some extent, and its defective is that they mainly still rely on system's host CPU control, and virus can be broken through its defence line by host CPU fully.Though also existing people proposes " being independent of the prevention method of system's host CPU ", probably also has a segment distance from practical product and even a kind of practicable technical scheme.Its defective is that " unauthorized access (poisoning intrusion) " still prolongs personnel selection with the division of " Lawful access (non-virus operation) " and be limitation standard, promptly poisoning intrusion is taked the method for " intercepting ", this must cause the normal legitimate right of system to be subjected to illegal restriction, and some application software operation is hindered.This is because of the resource for the operating system administration, and system all has the right to visit at any time.This is an one, also is the principle deficiency of said method on gas defence mechanism.And the generation of " right to access table " also is difficult for realizing.Its two, " additional protection mechanism hardware in the original system hardware environment " as stated above be difficult for to be realized technically, especially lacks the type (as: original-pack AST, COMPAQ computing machine) of technical information for those, more difficult technically realization.
The objective of the invention is to overcome above-mentioned shortcoming:, propose a kind of product and practicable technical scheme of new antivirus card according to new anti-virus mechanism.
The measure that the present invention takes is:
1. on gas defence mechanism, replace the method for original " intercepting " with the method for poisoning intrusion being taked " dredging ".Opening up the place of safety on (mainly being hard disk) on the non volatile media, virus can't be invaded, simultaneously guidance system avoid this place of safety or with system bootstrap to other place, thereby make the normal lawful authority of system can not be subjected to illegal restriction.
2. the hard card that above-mentioned place of safety is inserted on the expansion slot is being protected utterly.Hard card is easy to realize technically, even for the very opaque original-pack AST of technology, COMPAQ type, experimental results show that all practical.
3. the Lawful access of above-mentioned place of safety starts the machine by clean (virus-free) key floppy disk, and is aided with artificial hard switching setting according to screen prompt and carries out secure access.
In conjunction with a kind of embodiment principle of specification and implementation method:
Fig. 1 is the block diagram of antivirus card on computer bus.
Fig. 2 is the schematic diagram of antivirus card.
The invention is characterized in, the key floppy disk that it comprises antivirus card and adapts with it, Comprise decoder and tri-state switch in antivirus card, its course of work is by logic circuit pair The instruction of computer access virus infraction hard disk is deciphered, thereby reaches the protection hard disk secure The purpose in district, said key floppy disc, it is a clean boot disk, has at disc recording Close operation hard disk secure district, make this place of safety become the implicit zone of not accessing of operating system Application program and the application program of guiding user security operation.
We can obtain a certain concrete type by the INT13 of DOS system is access hard disk how.In an embodiment, we know, for COMPAQ, AST type, when system's host CPU is write hard disk 0100-01FF magnetic track, are by writing 01 (the hard disk magnetic track is high 2) to I/O port one F5, write to 1F7 that 30 (write order sign indicating numbers) finish.
U1; U6; U8 and U2 form an I/O port (address is 1F5) of main system; U1; U6; U8 and U4 form another I/O port (address is 1F7) of system; two ports and U7; U9; U10; U11; U12; U3; the U5 acting in conjunction; when making host CPU revise (write or format) hard disk 0100-11FF magnetic track; by U12 tripod output high-level control signal; this signal controlling triple gate U13 disconnects; thereby the cable (the umbilical cable line that connects main system and hard disk) that will be connected on the U13 disconnects; make main system and the hard disk can't communication, and reach the purpose of protection hard disk.Host CPU is to other operations of hard disk, and then this card guarantees that host CPU is without hindrance to the hard disk communication.
When hard disk went into operation, the place of safety that we can will be to be opened up with the FDISK of DOS (for example: hard disk 0100-11FF magnetic track) be made as a Logical Disk (for example D dish).Then the subregion chain of this Logical Disk is given up (for example changing complete 0 into).Like this, this Logical Disk just becomes an implicit dish of operating system, and under the normal condition, system can not visit this place of safety.
When needing the Lawful access place of safety, start the machine with a clean key floppy disk, the user only needs to get final product according to prompting operation.(toggle switch U18 under user's human intervention, make hard card connect or close) by the software on the key floppy disc finish automatically implicit Logical Disk subregion chain recovery, revise visit (place of safety generally is not made as the workspace, has only and confirms the just directly operation on implicit dish of virus-free software) operation.
The present invention compared with prior art in principle has solved the place of safety not by poisoning intrusion And illegally do not limit the normal right of operating system, scheme facts have proved practical. Also have Be exactly that the antivirus card volume is little, use components and parts few with operation is simple.
Claims (3)
1, a kind of computing machine antivirus card, it is characterized in that comprising in the antivirus card hard disk command decoder and tri-state switch, wherein the output terminal of code translator connects the break-make control end of tri-state switch, by logical circuit the instruction of the computer access hard disk that comprises the virus instruction of encroaching on hard disk is deciphered, when revising the place of safety that some physical space of hard disk forms, code translator can be controlled tri-state switch and disconnect, when not revising the place of safety that some physical space of hard disk forms, code translator can be controlled the tri-state switch closure.
2, computing machine antivirus card according to claim 1, it is characterized in that, when revising the place of safety that some physical space of hard disk forms, code translator can be exported high-level control signal, this signal controlling triple gate disconnects, and makes main system and the hard disk can't communication, when not revising the place of safety that some physical space of hard disk forms, the tri-state switch closure, host CPU is without hindrance to the hard disk communication.
3, computing machine antivirus card according to claim 1 is characterized in that, by reading the program on the key floppy disc, can realize the modification of Logical Disk subregion chain, the operation of guiding user security.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB941194116A CN1322424C (en) | 1994-12-20 | 1994-12-20 | Virus proof tech. for computer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB941194116A CN1322424C (en) | 1994-12-20 | 1994-12-20 | Virus proof tech. for computer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1127386A CN1127386A (en) | 1996-07-24 |
| CN1322424C true CN1322424C (en) | 2007-06-20 |
Family
ID=5039213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB941194116A Expired - Fee Related CN1322424C (en) | 1994-12-20 | 1994-12-20 | Virus proof tech. for computer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1322424C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108595949A (en) * | 2018-03-13 | 2018-09-28 | 广州市冰海网络技术有限公司 | A kind of computer anti-virus attack device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2081110U (en) * | 1990-08-29 | 1991-07-17 | 北京海淀计算机多维公司 | Antivirus card for microcomputer |
| US5144660A (en) * | 1988-08-31 | 1992-09-01 | Rose Anthony M | Securing a computer against undesired write operations to or read operations from a mass storage device |
| CN1080750A (en) * | 1992-06-24 | 1994-01-12 | 北京华能地学高技术联合公司 | A kind of technology of automatic dump virus |
-
1994
- 1994-12-20 CN CNB941194116A patent/CN1322424C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5144660A (en) * | 1988-08-31 | 1992-09-01 | Rose Anthony M | Securing a computer against undesired write operations to or read operations from a mass storage device |
| CN2081110U (en) * | 1990-08-29 | 1991-07-17 | 北京海淀计算机多维公司 | Antivirus card for microcomputer |
| CN1080750A (en) * | 1992-06-24 | 1994-01-12 | 北京华能地学高技术联合公司 | A kind of technology of automatic dump virus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1127386A (en) | 1996-07-24 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070620 Termination date: 20100120 |