After Mr. Chen's Yanzhao Gate in 2008, everyone suddenly started to save photos with online disks. But a few days ago, even Apple's iCloud played Yanzhao Gate. It seems that "data" security is really urgent.

We have spent a lot of effort to keep private data, but there have been many precedents for civil NAS, encryption USB flash drives, and even online disks to be cracked. So this time, we caught the encryption tool NFC security card, which has no precedents, to see what it is and how it performs.

Unpacking and appearance

▲ Strictly speaking, this is not unpacking, because the security card is not packaged with a box _ (: ☒ "∠) _. When the "machine" was delivered, there was only one transparent plastic film package.

▲<The lower left corner of the back is a low-key NFC glazed logo.

▲ Open the red fixing belt, and put the safety card and instruction card in the cardboard package.

▲ The three-dimensional dimension of the security card is 5.4 * 8.6 * 0.8 cm. In plain English, it is the same as ID card and bank card.

▲ The white card is hexagonal grid, and the lower right corner is a silver English logo.

▲ The number in the upper left corner of the back is the factory number, and the next six digits are also the factory password of the card. NFC and storage space are marked in the lower left corner. Well, yes, I was stunned at that time. It really only has a capacity of 8kb

working principle

With the official app and NFC functions, the security card can provide dual encryption protection of "password+NFC". The principle is extremely simple, that is, app is responsible for software encryption, while NFC chip is responsible for hardware protection and data storage.

In addition, after trial and verification, it is found that the security card can only be used to save and encrypt text information.

Function operation

You need to download an application called "Security Card" before using the card. Because iPhone 6 has just joined NFC, these NFC devices only support Android devices for the time being.

▲ After the NFC function is turned on, close to the card, the official application will automatically open and pop up the password input interface.

▲ The password can be changed automatically after entering the application, and the length of the password is forced to be more than 6 digits.

▲ After entering the password, you can see the internal storage of the card. In fact, it is a notepad with 45 available entries, and the word number of each entry is limited to 150 characters. However, it is surprising that it has its own expression library

▲ In order to protect data, the official app is strictly an offline application, and it blocks the screen capture function. When the user attempts to capture the screen, a prompt "DRM protects the image but cannot capture the screen" will pop up. Of course, the software still cannot prevent the eavesdropper from stealing XD data by taking live photos

▲ Another security measure is that every time the window is skipped, or even every change action, the NFC needs to be paired again and the password needs to be entered. Users can choose to temporarily store the password, so that they do not need to input the password frequently. However, when they come back from the window, they still need to re pair the NFC

▲ It may be that the card storage space is really small, so the application provides the function of importing and exporting text content. The exported data can also be encrypted and cannot be read by other applications.

▲ As a security product, operation log is very necessary. You can see all the records read and saved on the card.

Based on the capacity, it should be designed to store important passwords such as bank cards and Alipay. Even if the software password or the software itself is cracked, the hacker can do nothing without getting your physical card.

In terms of the security performance of the card itself, its official website gives a description of "commercial financial chips, CC EAL 4+international information security assessment standard certification, and special physical protection added to the card's secure storage area, which can prevent the chip from being disassembled and directly read by bypassing password verification".

Although it can't be tested, it seems that there is still a security guarantee, and this is a niche product. I'm afraid that few people will go out of their way to solve the problem

summary

The safety card may take into account the safety problem (to prevent other NFC devices from rubbing your card on the bus?). It has strict requirements on the matching distance and matching "posture" of the NFC. If you change the position, you may not be able to pair, which will give you a less sensitive feeling.

Another obvious problem is that due to the transmission speed of NFC, the card storage space is surprisingly small, and sensitive pictures and recordings cannot be stored with it naturally. However, we should know that even the old sim card can have a capacity of 64k. Even as early as 2006, China Mobile introduced a sim card with its own storage, and its maximum capacity can also reach 2GB ▼

As the old saying goes, locks can prevent thieves and prevent themselves. If you forget your password, even the authorities have no way to retrieve it, so your data can safely enter the landfill.

Finally, it is a sad price problem. Its price in Amazon is 85 yuan. Cough, the price is a little hehe. Before purchasing, you should measure your wallet and personal needs