| Cryptographic chip plays an important fundamental role in InformationSecurity. The security of a cryptographic chip is one of necessary conditionsfor the Security of Information System. The improper implementation of acryptographic chip may leak key information of the chip through so called"side channels" as power, timing, and electromagnetic emanations, whichmake cryptographic chip insecure. The Power Analysis is a type of method toinfer secret key by analyzing power curves of a cryptographic chip. Thismethod brings serious challenge for the security of Cryptographic Chip.To study the method of power analysis and anti-power analysis oncryptographic chip, based on current chip design flow and soft tools, asimulation platform for research was constructed in this thesis. This platformacquires power curves of a chip by method of soft simulation through whichcan avoid the risk of ASIC production and is convenient for academicresearch.Based on the platform, thesis studied and carried out a type ofDifferential Power Analysis based on hamming difference, which aimed at analgorithm core of DES by ASIC, and provided a method to forecast thenumber of messages needed for power analysis. The experiment results provethe existence of correlation between hamming difference and power, and theeffectiveness of this type of method for a block cipher chip with specialconstruction.Detached Power Module is a type of common method against PowerAnalysis by using capacitors that can charge and discharge. This module hasmerits as simple structure, low additional power consumption and so on.Aiming at a DES module that has about 40000 transistors, thesis put forwardtwo types of Detached Power Module and simulated them. Experiment resultsindicate that a cryptographic chip combined with this module can workproperly and also can resist differential power analysis when the capacitorsare 100pf of which area is about 75*150um2. Therefore, the Detached PowerModule has possibility to be integrated into a chip. |
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