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A novel modular exponent randomizing method is proposed to resist side-channel attack in RSA cryptosystem. The limitation of this method is given and the way of using random values also brings the security benefits. Experimental results show that though the randomized exponentiation sequence can be analyzed, the real private key is still covered. At last, the attack cost for this randomized sequence is evaluated. Being able to positively identify users is an absolute necessity for any kind of serious wireless business application, and RSA Security is making it easier to accomplish this for both wireless and wired access. Nowadays, various cryptanalysis methods come in sight ceaselessly.
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