1, the choice of chip platform
A
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We all know that there are two camps in the embedded encryption industry. One is the traditional logic encryption chip, and the IIC interface is used. The principle is EEPROM peripheral, plus hardware protection circuit, built-in algorithm; the other is The smart card chip platform makes full use of the high security of the smart card chip itself, and the old attacking various external attack means. The logic encryption chip itself has a weak protection capability, and most of the decryption companies can easily crack it and have gradually been eliminated. Instead, it is the best proven smart card platform. In order to improve the high security of the smart card chip, the smart card chip to be selected has the EAL4+ chip of the International Security Certification Committee, otherwise the security is difficult to meet the requirements. Lingke Xinan's LKT series of encryption chips fully meet this requirement, while other companies use smart card chip platform encryption chips, but can not be reached.
2, the security of the chip operating system
Under the premise of determining the smart card chip platform, it is necessary to consider the security of the chip operating system. The LKCOS operating system of Lingke Xinan has been strictly tested by the authoritative department and has high security and no security loopholes. A PBOC-certified encryption chip system cannot be highly secure. In addition, Lingke Core's LKCOS can effectively manage the internal resources of the chip, and at the same time protect the underlying interface, and do a lot of effective protection to ensure that pirates can not attack or crack from the chip operating system. This is very important. Other encryption chip vendors using smart card chip platforms only provide an interface for algorithm download. There is almost no processing for the underlying protection of chip resource management and interfaces. Then, pirates can be used as vulnerabilities. Attacked. The Lingke Xinan R&D team reached the above conclusion after carefully comparing the similar products.
3, the choice of encryption scheme
Traditional encryption chips are algorithms that use algorithm authentication. What they advocate is how complex the encryption algorithm is and how difficult it is to crack, but does not consider the existence of a huge security hole in the algorithm authentication scheme itself. We clearly know that the MCU is an insecure carrier. It can be said that it is completely transparent to the pirates. To do algorithm authentication, it is necessary to write the key or password in advance within the MCU. After giving the MCU a judgment mark, as a judgment basis for the execution of the MCU, the pirate can easily grasp this point to attack, simulate giving a signal to the MCU, and easily bypass the encryption chip to achieve the purpose of cracking. If you want to crack the internal data of the chip, it can be cracked by traditional means such as slice, ultraviolet light, debug port, energy analysis and so on.
The encryption chip using the smart card chip platform can effectively protect these attacks, and part of the code or algorithm in the MCU is implanted into the encryption chip, and these programs are executed inside the encryption chip, so that the program code inside the encryption chip becomes the whole. Part of the MCU program, so that the purpose of encryption can be achieved, because the program inside the MCU is incomplete, even if it is pirated, due to the lack of key code, it can not be copied, then what kind of code or program is selected and put into the encryption chip It is to test the skill of the MCU programmers, as much as possible to implant the program, as much as possible to increase the strength of the algorithm, it can effectively prevent the possibility of being deciphered. Therefore, the LKT4200 32-bit smart card chip platform can solve all the problems, and even floating-point operations inside the chip are no problem.