Function of encryption chip

1. Hardware protection:

When designing PCB, use some chips with encryption algorithm (such as symmetric algorithm (DES / SM1), asymmetric algorithm (RSA / SM2), digest algorithm (SM3 / SHA-256), etc.). In order to consider the cost, SHA-256 hardware only encryption chip is generally used. (for example, Renault rjgt102) sets the key in the MCU and encryption chip respectively, and handshakes communication for many times in the program. This key is set by the manufacturer.

2. Software protection:

If your product has its own unique algorithm and has advantages in the industry. Of course, I don't want my algorithm to be stolen by others. At this time, we can consider a chip that needs software protection (such as rjmu401 of Wuhan renajet), which can not only tamper with the detection circuit in this way, but also prevent external malicious attacks. And can put the important code or data of MCU into the encryption chip, which also has the encryption algorithm.