JTAG authentication method and device based on vehicle-mounted Ethernet chip and storage medium

By using username and double-layer key authentication methods in vehicle-mounted Ethernet chips, the existing JTAG authentication methods are solved in the application of on-board chips, and the unique authentication and multiple protection of each chip are realized, which significantly improves the security of the chip.

CN120012059APending Publication Date: 2025-05-16KUNGAO XINXIN MICROELECTRONICS (JIANGSU) CO LTD
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Patent Information

Application Number
CN202510036113.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-09
Publication Date
2025-05-16

AI Technical Summary

Technical Problem

The existing JTAG authentication methods have security risks in vehicle-mounted chip applications. The key authentication of the same batch of chips is consistent and is easy to be cracked. The public test data registers are not protected and cannot provide security authentication.

Method used

Authentication is performed using username and double-layer key. Username, password1 and password2 are input through the JTAG interface, and hardware algorithms are used to verify to ensure that each chip has a unique authentication key, increasing the difficulty of cracking, and locking the JTAG interface through Ethernet broadcast messages when authentication fails.

Benefits of technology

The unique authentication of each chip is realized, the security of the chip is improved, the same batch of chips are prevented from being cracked, and the security of the system is enhanced through multiple protection mechanisms.

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Abstract

The invention discloses a JTAG (Joint Test Action Group) authentication method and device based on a vehicle-mounted Ethernet chip, and a storage medium. The JTAG authentication method comprises the following steps: S1, configuring a chip id, an authkey0, an authkey1 and an authkey2 for each Ethernet chip; s2, according to a JTAG interface access request, the input password1 and the input password2 are compared with expected results calculated by a hardware algorithm respectively, so that whether the enabling of a JTAG access module is started or not is determined; if any secret key is not successfully verified, the access permission is not opened, retry waiting is carried out, and if the number of times of retry waiting reaches the upper limit, the hardware logic stops the authentication process, and the access channel is closed. According to the scheme, different user names and passwords can be provided for chip products of the same batch for access, the user names and the passwords must appear in pairs, otherwise, authentication is not passed, the number of access times is limited, and once the number of input mismatching times of the user names and the passwords reaches the upper limit, the authentication module immediately stops authentication and locks permission access of the JTAG, so that the authentication efficiency is improved. And the safety of the vehicle-mounted Ethernet chip is improved.
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