The message blinding method is the most efficient and secure countermeasure against first-order differential power analysis(DPA). Although cross correlation attacks(CCAs) were given for defeating message blinding methods, however searching for correlation points is difficult for noise, misalignment in practical environment. In this paper, we propose an optimized cross correlation power attack for message blinding exponentiation algorithms. The attack method can select the more correlative power points of share one operation in the modular multiplication by comparing variances between correlation coefficients. Further we demonstrate that the attack method is more efficient in experiments with hardware implementation of RSA on a crypto chip card. In addition to the proposed CCA method can recovery all 1024bits secret key and recognition rate increases to 100% even when the recorded signals are noisy.
This paper presents an extension of the doubleerasure-correcting EVENODD for tolerating disk failure in highly available data storage system,which called the V codes. The V-Codes have a simple geometrical structure, namely, they can correct any double column erasure errors. In addition, the parity symbols are evenly distributed among all the columns, thus the bottleneck effects of repeated write operation are naturally overcome. We provide detailed V code's decoding algorithms for correcting various double node failures with a geometrical structure. The complexity of encoding and decoding, the small write performance of three types of codes, are compared and analyzed, thus the V code is practically very meaningful for storage systems that need higher reliability. key word:
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