Study of Differential Power Analysis on the Cryptographic Algorithm in Smartcards
智能卡加密算法的微分能量分析方法研究*

DPA is a new kind of attack to smartcards in recent years.Different from old methods,it correlates the power consumption in circuits to operand and applies statistics to derive information about key,so it is dangerous. The DPA attack to the usual cryptographic algorithm used in smartcards is analyzed in depth,including its principle,steps,character and realization.The DPA attack to the AES candidate algorithms is discussed,and the conclusion is that the new generation block cipher (can't) resist DPA attack,too.At last,some countermeasures to DPA are given.