JPH04128948A - Information processor - Google Patents

Abstract

PURPOSE:To improve the performance of holding data security by providing an information processor with the function that, when the cover for the main body of the unit is opened, an abnormal condition is detected and the content of data in the backup memory is destroyed. CONSTITUTION:This processor is provided with a security holding means 21 for holding the security of data stored in backup chip memory 2, and the security holding means 21, when the cover for the information processing unit is opened, detects an abnormal condition and destroys the content of data stored in the backup memory 2. Thus, since the unit is provided with the function that when the cover for the unit is opened, an abnormal condition is detected by a microswitch and destroys the content of memory data backed up by the battery, the performance of holding data security can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an information processing device, and particularly to an information processing device suitable for maintaining data confidentiality.

(Prior Art) In recent years, some information processing devices (eg, personal convenience stores, etc.) use battery-backed memory (eg, 5-RAM, etc.) as a data storage medium. FIG. 3 shows an example of the configuration of a conventional information processing device. In Fig. 3, 1 is a CP that performs various controls of the system.
U, 2 is a battery backup memory, 3 is a battery for the battery backup memory 2, 4 is an interrupt controller, 5 is a main memory, 6 is a timer, 7 is a DMA controller, 8 is a floppy disk controller, 9 is a floppy disk, 10 is hard disk controller,
11 is a hard disk, 12 is a CRT controller, 1
3 is a CRT, 14 is a keyboard controller, 15 is a keyboard, 16 is a printer controller, 17 is a printer, and 18 is a serial interface controller.

In an information processing device with such a configuration, when maintaining the confidentiality of data stored in the memory 2 backed up by the battery 3, a password method is used to restrict usage rights, or the data itself is encrypted before use. was. The password method uses a one-way cipher method to reduce the risk of the password file being revealed intentionally or accidentally.
There are many systems that use ``scheme''. However, by increasing the types and number of characters that can be specified for passwords,
), it is still vulnerable to trial-and-error attacks. Therefore, we concatenated random numbers to the password and then encrypted it.
It has also been devised to register calculation rules rather than the password itself.

In addition, as for technology related to data security, literature = "Computer Security", Kindai Kagakusha Publishing, published October 1, 1980, pp. 78-79, 92-
There are 96 pages.

(Problem to be Solved by the Invention) However, with the above conventional method, there is a risk that the hardware itself may be stolen while it is backed up by a battery, or that the cover of the main unit may be opened and the hardware may be modified. This poses a problem in that it is possible to know the contents of data without destroying it, and it is also possible to decipher codes and change the contents.

An object of the present invention is to solve such conventional problems and provide an information processing device that destroys data in a backup memory when the cover of the main body is opened, thereby improving data confidentiality. .

(Means for Solving the Problems) In order to achieve the above object, an information processing device of the present invention includes a secrecy means for keeping data in the backup memory secret, in an information processing device having a battery and a battery backup memory. The security means is characterized in that when the cover of the main body of the apparatus is opened, an abnormal state is detected and the data contents in the backup memory are destroyed.

(Operation) In the present invention, when the cover of the device main body is opened, the security means detects an abnormal state and destroys the data contents in the backup memory. This improves data confidentiality.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a configuration diagram of an information processing apparatus showing an embodiment of the present invention.

In FIG. 1, 1 is a CPU, 2 is a battery backup memory, 3 is a battery, 4 is an interrupt controller, and 5
is the main memory, 6 is the timer, 7 is the DMA controller, 8
is a floppy disk controller, 9 is a floppy disk, 10 is a hard disk controller, 11 is a hard disk, 2 is a CRT controller, 13 is a CR
T, 14 is a keyboard controller, 15 is a keyboard, 16 is a printer controller, 17 is a printer, 18
21 is a serial interface controller, and 21 is a secret-keeping circuit that is characteristic of the present invention, and is provided between the battery 3 and the backup memory 2.

In this embodiment, by providing the information processing device with the confidentiality circuit 21, if the hardware itself is stolen and the main body cover is removed, the data in the backup memory 2 will be destroyed, so confidentiality can be maintained. .

FIG. 2 is a diagram showing a detailed configuration example of the secret-keeping circuit 21 shown in FIG. 1. The - (minus) side of the battery 3 is grounded, and the + (plus) side is connected to the microswitch 21.
1 common, and when the microswitch 211 is on the ■ side, it is further connected to the power source of the battery backup memory 2 and the collector of the transistor 213 via the collector current protection resistor 212. When the microswitch 211 is on the ■ side, the base current limiting resistor 21
4 to the base of the transistor 213, and the photocoupler 216 via the photocoupler input current protection resistor 215.
The output of the photocoupler 216 is connected to the input of the CPU
Connected to 1.

Further, the emitter of the transistor 213, the ground of the battery backup memory 2, and the ground of the photocoupler 216 are grounded like the negative side of the battery 3.

The intention of this invention is to detect that the cover of the hardware main body is opened using the microswitch 211. When the microswitch 211 is on the ■ side, the normal state is on, and when it is on the ■ side, the hardware is in the normal state. This is an abnormal condition when the is opened.

In the normal state, the microswitch 211 is on the ■ side, current is supplied from the battery 3 to the power source of the battery backup memory 2, and the transistor 213 and photocoupler 216 are in the OFF state and do not perform any operation. That is, the contents of the battery backup memory 2 remain retained.

In the case of an abnormal condition, two types of operations are performed. One is when the microswitch 211 operates to the ■ side, it cuts off the power supply to the battery backup memory 2 and simultaneously cuts off the power supply to the battery 3.
from the transistor 21 via the microswitch 211
3 base current flows, battery backup memory 2
The remaining charge in the power supply is discharged as a collector current to destroy the contents of the battery backup memory 2 in terms of hardware. For example, this can be done by cutting off the battery supply line. The other one is micro switch 211
If it operates on the ■ side, current flows from the battery 3 to the photocoupler 216 via the microswitch 211, turns on the photocoupler 216, notifies the CPU of abnormality detection, and stores the battery backup memory 2 in software. Destroy the contents. For example, this is done by rewriting the data.

(Effects of the Invention) As explained above, according to the present invention, when the cover of the information processing device body is opened, the microswitch detects an abnormal state and destroys the memory data contents backed up in the battery. Since this method has been established, it is expected that the ability to maintain data confidentiality will be improved.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an information processing device showing an embodiment of the present invention, FIG. 2 is a diagram showing a detailed configuration example of the confidentiality circuit shown in FIG. 1, and FIG. 3 is a configuration diagram of a conventional information processing device. It is. 2... Battery, 3... Battery backup memory, 21... Secret-keeping circuit, 211... Micro switch, 212, 2
14.215...Resistor, 213...Transistor,
216...Photocabra.

Claims (1)

[Claims] An information processing device having a battery and a battery backup memory, further comprising a confidentiality means for keeping the data in the backup memory confidential, and the confidentiality means is configured to protect the data when the cover of the device main body is opened. , an information processing device that detects an abnormal state and destroys data content in the backup memory.