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the mystery of single-chip decryption

  Time:2013-04-08 15:49

 

 

the mystery of single-chip decryption

MCU usually has an internal EEPROM/FLASH to store programe and work
data for users.In order to prevent unanthorized access to or copying the
internal procedures,most single chip have encrypt bytes and  encryption
lock location to protect the program on the chip .If encryption lock button were 
locked in programming , users will not be able to directly read procedure in
the single chip microcomputer through ordinary programmer , this is
microcontroller chip encryption.
 
However,the key information in the chip can be extracted by MCU attackers.
Why?How to do it? MCU attackers make good use of the loophole in
microcontroller chip design or many software dedects,relying on special
equipment or homemade equipment,to achieve the chip encryption work.
Single chip microcomputer is just one of the classes chips which can
load program.The chip which can burn program and encrypt chip also
include DSP, CPLD, PLD, AVR, ARM, etc.Meanwhile,there are one kind of
chip including encryption algorithm used for encryption or verification
manufacturer code, this kind chip can also achieve the goal of prevent
electronic copy.

In simple terms, single-chip decryption is the technology to directly obtain
files protected in the chip through certain equipment and methods.