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MCU crack skills:
Before choosing the encryption chip, we need to thoroughly investigate and understand the new progress of MCU crack technology, including which MCU has been confirmed and can be cracked. Try not to choose the MCU which can break or with the same series and the same type of chip to select the new technology, new structure and shortlisting time. If ATMEGA88/ATMEGA88V can use, the cost of cracking at home is about 1 million yuan, and the other can also combine with CPLD, so the decryption cost is very high and deciphering is general. The CPLD is about 10 thousand.
Try not to use the MCS51 series MCU microcomputer, because the MCU is the most popular in China, and it is also the most thorough research.
The original product of the product generally has the characteristics of prodigious output, so it is possible to choose MCU microcomputer to increase the difficulty of the counterfeiters\\\' purchase and select some different MCU, such as Motorola MCU. At present, the domestic will develop and use very few people familiar with Motorola MCU, so the cost of cracking is also quite high. From about 8000~3 million.
Under the condition of design cost licensing, a smart card chip with a hardware self-destruction function should be selected to deal with physical attacks effectively. Also, when the program design, the time to the timing function, such as the use of 1 year, will automatically stop the operation of all services, which will increase the cost of the cracker.
If conditions permit, two different types of SCM can be used to back up each other and verify each other, thus increasing the cost of MCU crack.
Somebody Polish off chips, models, and other information, or reprint other models.
We can use the unmarked and unused flag bit or unit as the software symbol.
Using the A5 instruction in MCS-51, all the data in the world, including the English data, do not speak this instruction. A good encryption instruction. The A5 function is a two-byte empty operation instruction encryption method with a two byte or three-byte operating code after A5 because all disassembler software will not disassemble A5 instruction, cause real The routine program to remove the mess and execute the plan without a problem. The copycat cannot change your source program.
It should write on the development time of your big name unit and the parlance of imitation.in order to obtain legal protection; also, when writing your name, it can be random, that is to say, using some algorithm, under different external conditions. Your name is different, such as husoon1011, jisppm1012 and so on, so it is more difficult to reverse the remittance. Edit and modify.
The use of high-grade programmers, burning the internal part of the pin, how to burn down, you can refer to the SCM chip burning method and MCU crack.
The whole circuit board sealed with the secrecy silica gel (epoxy resin sealing glue). There are many good soldering plates on PCB, and some good components can dop in the silica gel. At the same time, the electronic components around the MCU circuit can wipe out as much as possible.
To SyncMos, the Winbond single chip will convert the file to the HEX file. So the program space automatically added 00.if you are used to the BIN file, you can also use the programmer to change the FF in the blank area to 00.so the wide MCU crack cannot find the space in the chip. And cannot carry out the subsequent decryption.