Datang Microelectronics independently developed fingerprint algorithm processing chip to provide support for national secret encryption and decryption coprocessor

At present, fingerprint recognition technology has gradually become the standard function of mobile phones, and identity verification and payment functions can be completed through fingerprints, which provides great convenience for people. However, considering the current processing capabilities and security protection measures of fingerprint algorithms, there are still many technical problems and security risks. Therefore, Datang Microelectronics has independently completed its high-performance fingerprint algorithm processing chip DMT-FAC-CG4Q to provide support for national secrets. The encryption and decryption coprocessor provides a hardware foundation for high security and controllable applications.

Application status

At present, most of the fingerprint solutions use the fingerprint soft algorithm form, that is, the fingerprint algorithm runs in the ordinary MCU chip. The security of the scheme is poor, the fingerprint processing process is easily invaded, the fingerprint feature data is easily stolen, and the comparison result may be forged. The fingerprint algorithm storage security cannot be guaranteed, the fingerprint feature data storage security and the fingerprint data transmission security are safe, the fingerprint algorithm is used to securely process the chip, the fingerprint algorithm is loaded into the special chip, and the security protection is used to protect the storage and transmission security. Now fingerprint mobile phones basically have security problems. In 2013, Moto part of the mobile phone TrustZone kernel was cracked, you can unlock the bootloader and load any system. After the Samsung GalaxyS5 attacker root kernel in April 2015, you can directly access the fingerprint device to obtain fingerprints. Impersonation of the user. The main reason is that TEE storage security data is used in mobile phones. The storage security of TEE is not enough to ensure the security of key data. The TEE defense physical attack capability is poor. The data and code in the external memory may be tampered with; the TEE implementation may be There are loopholes, more and more code leads to an increase in the number of bugs, and multiple TEE systems coexist, resulting in more and more complex implementations. Therefore, the current TEE cannot achieve the security level of the SE.

Safety protection technology

The fingerprint algorithm security processing chip provides a trusted operating environment, a trusted storage environment, and a secure transmission interface. Various security protection technologies are used: (1) Physical security protection: top layer metal coverage, active anti-peel detection technology; AcTIve Fuse, which provides protection for the test state of the chip; special handling of critical signal lines on the layout prevents physical detection. (2) System security protection: using memory access control technology, memory encryption and bus scrambling technology, clock scrambling technology, random number online detection technology, chip key data management technology. (3) Algorithm security protection: support international and national secret algorithms, using hidden technology and mask technology to ensure algorithm security. (4) Environmental safety protection: voltage detector, frequency detector, temperature detector, power Glitch detector, photodetector, clock glitch filter, true random number generator, etc. are used.

Protects against intrusive attacks (probes, forcing, maneuvers, reverse engineering, etc.), information breach attacks (bypass attacks, timing analysis, power/electromagnetic gaps), fault attacks (voltage glitches, light attacks) through a variety of security protection technologies , differential attack attacks on encryption algorithms, etc., combined attacks (power analysis + optical attacks + reverse attacks, etc.) and other attacks to ensure data storage and transmission security.

Based on our unique high security protection technology, Datang Telecom of Datang Telecom has launched a high security fingerprint algorithm security processing chip DMT-FAC-CG4Q.

Datang Fingerprint Algorithm Security Processing Chip DMT-FAC-CG4Q

DMT-FAC-CG4Q fingerprint algorithm security processing chip uses high security, high performance, low power CPU core. It is a multi-application chip integrating international common encryption algorithm and national security algorithm. It integrates independent security co-processing. The device uses a variety of chip security technologies to meet the requirements of EAL4+ and national security chips. At the same time, the independent security coprocessor can provide a safe operating environment and storage environment for the processing of sensitive data, and can be applied to high security fingerprint recognition and financial payment.

Figure 1 DMT-FAC-CG4Q chip diagram

ØCPU processor core ARMSC300 core frequency 100MHz high performance, high security, low power consumption

Ø memory

512KBFlash, 144KBSRAM, 4KB encryption and decryption RAM

Ø Communication interface

USB2.0, support FullSpeed ​​and HighSpeed ​​rates

ISO7816, supports T=0 and T=1, one master-slave can be matched, one master, a total of two.

SPI, master/slave can be matched, a total of three, more than 12M

UART, maximum rate 115200bps 

I2C, master/slave can be configured to support three rates

NFC, 16-bit data interface

Ø Information security module

DES/3DES/AES/EC/RSA(4096bit)/SHA-1/SM1/SM2/SM3/SM4/SSF33

Ø Power control

Four chip sleep modes - shallow sleep, half sleep, deep sleep, full chip sleep

Ø Security protection

Independent hardware security processing module;

Support SM1/SM2/SM3/SM4 national secret algorithm;

Support international algorithms such as DES/RSA/SHA1;

Support encrypted FLASH and encrypted RAM;

The overall architecture complies with the SmartSA_32 security architecture requirements;

Chip integrity physical layout protection;

The CPU internally supports two levels of security protection mechanisms: core mode and user mode;

The internal data bus of the chip is dynamically added with descrambling;

The memory protection unit MPU implements fine-grained/configurable address check;

ISO7816 interface clock interference filtering;

High/low voltage detectors;

High/low frequency detectors;

High/low temperature detector;

SPA/DPA anti-attack design;

Abnormal working state detection;

Has obtained national secret secondary, UnionPay chip safety certification, domestic EAL4+;

High security fingerprint application program: 1. Second generation ID card fingerprint verification solution

After the second-generation ID card is loaded with fingerprints, the fingerprint module needs to be added in the second-generation card reading and writing machine to achieve the consistency of the person and the certificate, and solve the real-name system verification problem. Fingerprints are sensitive and confidential data, requiring a safe operating environment and storage environment. Datang Microelectronics fingerprint verification solution can ensure data security.

Ø High security ARM SC300 core MCU, embedded multi-security protection mechanism, can resist multiple forms of attacks;

Ø Fingerprint comparison algorithm in line with a test standard of the Ministry of Public Security;

Ø Support 192*192, 208*288, 256*360 sensors of various sizes;

Ø Guarantee the secure storage and transmission of fingerprint algorithms and fingerprint data.

2. Mobile phone terminal encryption application solution:

At present, in the mobile phone, the fingerprint algorithm runs in the TEE, and the fingerprint feature data is stored in the TEE, which is easy to be attacked and tampered with, and the fingerprint algorithm runs in the TEE, the transplantation is complicated, and the development cycle is long. If the fingerprint algorithm is run in a separate, relatively simple, high-security SE environment, the algorithm operation security and fingerprint data security can be guaranteed, and the development is simple and easy to implement.

Ø Support SPI interface, compatible with mainstream SENSOR;

Ø Provide operational security and storage security; ensure the security of algorithm issuance; ensure the output of the identification results is safe;

ØDMT-FAC-CG4Q interface is more comprehensive and can be used as Sensor Hub at the same time.

Ø Can be used as an encryption chip at the same time to realize encryption of voice and data.

Conclusion

With the application of fingerprint recognition technology more and more widely, it is more and more accepted by the public. In the fields of finance, public security, airport, education, intelligent buildings, PC computers, mobile terminals, etc., more and more fingerprint recognition application scenarios, fingerprints As a symbol of identity, its security is self-evident, providing a high-security solution that plays an important role in the safety of people and property.

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