关键词: 三重数字加密标准算法（TDES）, 能量攻击, 逻辑资源, 适用性

Abstract: Aimed at the DES design method against power analysis attacks mentioned in reference[1]，an improved one is proposed.Compared with the method of reference[1]，it has the same ability against the power analysis attacks.By analyzing the improved algorithm in theory，it is applicable for this method to make use of in the process of most of cipher algorithm’s design and implementation against power analysis attacks.The improved algorithm，while implemented based on FPGA，can not only save about eighty percent hardware storage resources，but also keep the operation rate in the same time.

Key words: Triple Digital Encryption Standard（TDES）, power analysis attack, logic resource, applicability