A high-speed security encryption Micro SD card

Abstract

The invention discloses a high-speed security encryption Micro SD card which comprises an SD interface chip, a security chip and a storage chip. An SD interface module and a storage controller are integrated in the SD interface chip; a cryptographic algorithm module, a COS module, a cryptographic algorithm accelerator and a bit operation accelerator are integrated in the security chip; and a storage module is integrated in the storage chip. The system also comprises an HSSPI interface and a DMA module, wherein the HSSPI main equipment is integrated in the SD interface chip; and the HSSPI slavedevice and the DMA module are integrated in the security chip. According to the invention, the data transmission rate can be increased, and the password operation processing rate can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of SD cards, in particular to a high-speed securely encrypted Micro SD card. Background technique [0002] At present, the practical application of commercial encryption mostly uses security chips as the carrier. Through SoC chip design technology, the national secret algorithm is implemented in the form of hardware IP core and integrated into the security chip. This not only makes full use of the advantages of fast hardware logic operations, but also fully guarantees the security of the national secret algorithm in the form of hardware. In terms of product types, there are products with various interface forms such as USB, serial port, SD, and Micro SD. Among them, the Micro SD card is widely used in smart phones, walkie-talkies, and security monitoring due to its high interface communication rate, small size and portability. , smart routers and other terminal devices with security business requirements. ...

AI Technical Summary

Problems solved by technology

[0010] (1) In solution 1, the security chip integrates all modules. This kind of "big and complete" solution has many problems: on the one hand, the integration of too many modules increases the design risk of the SoC security chip; on the other hand, the security chip In addition to storing key information such as keys and certificates, the embedded Flash of the chip also needs to save the COS code of the chip, and the storage module and SD interface module will greatly increase the amount of code, which requires the security chip to provide enough embedded Flash space. It not only increases the raw material cost of the product, but also puts forward higher requirements on the process yield of the chip, which will also lead to an increase in cost

In addition, when the storage module or SD interface module is updated, the entire security chip must be redesigned, and the additional loss is too large

[0011] (2) In the second option, although the storage controller is planned separately to form a storage control chip, the SD main equipment module needs to be added to the security chip, which affects the product cost; in addition, when the data storage function is completed, too many communication interface links, also affects the storage rate

[0012] (3) The cryptographic calculation rate of the encryption card is an important performance index of the product. Although the third scheme can avoid the shortcomings of the schemes 1 and 2, the cryptographic calculation must be completed inside the security chip, and the data before and after the calculation must be processed with The low-speed SPI or ISO7816 between SD interface chips affects the overall processing rate of the product

In addition, inside the security chip, the data needs to be transmitted to the cryptographic algorithm module for processing under the control of the CPU according to the packet length specified by the cryptographic algorithm. Ordinary serial operations will also affect the processing rate

Images