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báo cáo hóa học:" Research Article Random Number Generators in Secure Disk Drives"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Random Number Generators in Secure Disk Drives | Hindawi Publishing Corporation EURASIP Journal on Embedded Systems Volume 2009 Article ID 598246 10 pages doi 10.1155 2009 598246 Research Article Random Number Generators in Secure Disk Drives Laszlo Hars Seagate Technology 389 Disc Drive Longmont CO 80503 USA Correspondence should be addressed to Laszlo Hars laszlo@hars.us Received 15 October 2008 Revised 19 March 2009 Accepted 9 June 2009 Recommended by Sandro Bartolini Cryptographic random number generators seeded by physical entropy sources are employed in many embedded security systems including self-encrypting disk drives being manufactured by the millions every year. Random numbers are used for generating encryption keys and for facilitating secure communication and they are also provided to users for their applications. We discuss common randomness requirements techniques for estimating the entropy of physical sources investigate specific nonrandom physical properties estimate the autocorrelation then mix reduce the data until all common randomness tests pass. This method is applied to a randomness source in disk drives the always changing coefficients of an adaptive filter for the read channel equalization. These coefficients affected by many kinds of physical noise are used in the reseeding process of a cryptographic pseudorandom number generator in a family of self encrypting disk drives currently in the market. Copyright 2009 Laszlo Hars. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. Introduction Cryptographic random number generators are employed in many embedded systems like in self encrypting disk drives such as the Seagate Momentus Full Disk Encryption FDE drives. The generated random numbers can be used for encryption keys facilitating secure communication via nonces performing self-tests and so forth. Previous states of the random