Detailed introduction of data destruction technology

release time：2021-04-02

Document destruction, detailed introduction of data destruction technology

File destruction and data information overwriting Data information overwriting is a more versatile data destruction method at this stage. It is applied to mobile storage devices that can repeatedly load data information. The operation steps are to continuously load data information with meaningless and irregularities. Into the substance, the original data information is covered. With the increase in the frequency of overwriting, the probability of the original data information being repaired approaches zero. The reference specification for overwriting can be seen from the "DoD5220.22M Standard" of the US Department of Defense, which states that when the information content on a mobile storage device is destroyed, the addressable module of the mobile storage device must be loaded seven times. Symbol, load the value 0xff for the first time, load the value 0x77 for the second time, and finally load any standard value several times. According to the data information covering seven times, it is impossible to restore the original data information on the mobile storage device. Purpose.

However, in the BMB21-2007 "Requirements for the Security and Confidentiality of Carrier Destruction and Information Removal Involving State Secrets" implemented by the State Bureau of Secrets in 2007, overwriting of data information was not used as a method of data destruction for confidential mobile storage devices. Therefore, in China, confidential mobile storage devices cannot be put into unclassified natural environments or low-density natural environments after they are resolved using this method.

File destruction, super-powerful demagnetization The super-powerful demagnetization method is used in hard disks, tapes and other magnetic mobile storage devices. In actual operation, put the magnetic mobile storage device into the super powerful degaussing machine. When the electromagnetic coil of the degaussing machine is connected to the power source, a strong electromagnetic field will be caused in an instant, which will destroy the magnetic structure of the material, and then there is no need to choose the magnetic mobile storage device. All data information is destroyed. The super-powerful demagnetization method is characterized by high efficiency, and the demagnetization can be carried out within a few seconds, and it can handle the residual current magnetic effect and the problem of changing the track very well. The defect is that the damaged hard disk with magnetic structure can no longer be used.

The super-powerful degaussing machine used for data destruction should be equipped with electromagnetic field monitoring equipment to ensure that the magnetic field caused by the magnet coil is not less than 8500 oe in the reasonable degaussing zone (the magnetic medium has certain resistance characteristics to the demagnetization effect of the external electromagnetic field, and the resistance characteristics are eliminated. The minimum magnetic induction intensity is called the coercive value, and the enterprise of the coercive value is oe). Table 1 shows the coercive value of various magnetic mobile storage devices.

Document destruction, incineration treatment, and high-temperature destruction method incineration treatment is to ignite the debris immediately after crushing the equipment used for mobile storage equipment. Because many harmful substances are released during the entire incineration process, this method is generally not recommended for application. High-temperature destruction can purchase high-temperature destruction furnaces based on our country’s information confidentiality evaluation. This type of furnace can be heated by microwave ovens or other methods to cause a high temperature of 300-1800°C in the furnace. Under normal circumstances, CDs, hard disks, and audio tapes will be at 150-300 Melting and cracking at temperatures above and below ℃, the most difficult to melt aluminum raw material in computer hard disks will just begin to crack at around 700 ℃. After the mobile storage device is completely melted, the goal of completely destroying data and information can be achieved. Because the high-temperature destruction furnace will cause higher heat and pollution, it is not suitable to be placed in general company offices. It must be placed in a technical and professional destruction place with good indoor ventilation.

Physical destruction method Physical destruction refers to the destruction of material storage components relying on external forces to make data and information impossible to repair. For general non-confidential mobile storage equipment destruction procedures, the process is relatively simple, just use a small punch (stamping die stamping machine) to destroy the material; the destruction of secret mobile storage equipment must use special equipment to carry out laser cutting and crushing. The particle size of the crushed sludge must comply with the relevant requirements of China's Information Confidentiality Standard BMB21-2007.

File destruction, chemical corrosion method The chemical corrosion method uses acid-base test reagents to etch the stock disk surface of the mobile storage device to prevent data restoration by destroying the stock disk surface. This type of method has been more effective in the past, but with the development trend of contemporary electronic information technology, the quality of mobile storage devices has been greatly improved. In order to better improve the wear resistance of the material disk body, It will be inlaid with a layer of aluminum alloy plastic film (its composition is 50%-54% nickel, 44%-40% copper, and 6% phosphorus). The aluminum alloy plastic film also improves the wear resistance of the material plate. Improved corrosion resistance, causing the actual effect of the chemical corrosion method to become worse and worse.