Data flow encryption SD card

Abstract

A data flow encryption SD card comprises a security chip. An SD memory card slave interface, various public key and private key encryption and decryption algorithms, various grouped data encryption and decryption algorithms, an embedded memorizer and an SD or eMMC main control interface are integrated on the security chip. The security chip is connected with an SD interface for being connected with an SD host through the SD memory card slave interface. The SD or eMMC main control interface is connected with a standard SD / eMMC controller for operating a nonvolatile memorizer. The standard SD / eMMC controller is connected with the nonvolatile memorizer for achieving the SD card large-capacity memory function through a NandFlash interface. The data flow encryption SD card has the advantages of being high in encryption and decryption speed, safe to use, low in cost and large in memory capacity.

Description

technical field [0001] The invention relates to a data stream encryption SD card. Background technique [0002] The SD card is a memory card standard and is widely used in portable devices, especially in mobile phones in the form of microSD packaging. [0003] With the continuous expansion of mobile Internet users and the rapid development of mobile Internet communication services, mobile financial services, and cloud storage markets, the requirements for information security are also increasing. The SD card with stream encryption function can well solve the security of mobile communication data, encrypted storage of cloud data and financial authentication business. For example, at present, the data stored in the mobile phone cloud is usually transmitted in clear text on the network, which is easy to leak. Even if some are encrypted, the key is stored on the mobile phone, which is easy to be attacked. The stream encryption SD card can save the private key in the SD card, d...

AI Technical Summary

Problems solved by technology

The disadvantages of this solution are: 1) The encryption and decryption operations do not run in the main control chip of the SD card, and need to be sent to the security chip through the SPI or ISO7816 interface for processing, and then return the result, so the encryption and decryption speed is relatively slow, and the security is not high. It is easy to leak information through communication lines; 2) The price of non-standard SD card controller chips is usually dozens of times that of standard SD card controllers

The disadvantages of this solution are: 1) The process update speed of Nand Flash is very fast, and the ECC requirements for Nand Flash are also increasing, basically every year. As a security chip, the cycle of security certification is usually relatively long, and the design is difficult. , and it is difficult to keep up with the update speed of ECC; 2) The SD card controller usually does not integrate embedded Flash inside, and the security chip must integrate embedded Flash to store sensitive information such as programs and keys

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