Download Algorithmic Aspects of Cloud Computing: First International by Ioannis Karydis, Spyros Sioutas, Peter Triantafillou, PDF

By Ioannis Karydis, Spyros Sioutas, Peter Triantafillou, Dimitrios Tsoumakos

This ebook constitutes the completely refereed post-conference court cases of the 1st foreign Workshop on Algorithmic elements of Cloud Computing, ALGOCLOUD 2015, held in Patras, Greece, in September 2015 along side ALGO 2015.

The thirteen revised complete papers provided including 2 instructional papers have been conscientiously reviewed and chosen from 37 preliminary submissions. They disguise a variety of subject matters in major tracks: algorithmic features of large-scale info shops, and software program instruments and dispensed architectures for cloud-based facts management.

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Additional info for Algorithmic Aspects of Cloud Computing: First International Workshop, ALGOCLOUD 2015, Patras, Greece, September 14-15, 2015. Revised Selected Papers

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The most significant bit (MSB) is the sign bit. Analogous with the address, each bit of the operands is secret shared. The outline of our RAM architecture is presented Fig. 2. In our architecture, we use a modified Harvard architecture which not only physically separates storage and signal pathways for instructions and data, but also separates the read-only and read/write part of data. Note that since Shamir secret sharing is not multiplicatively homomorphic, degree reduction is needed after several multiplications.

Still, the operations can be delegated by the users to powerful machines in the clouds, which perform these linear access to all items for executing operations without revealing their nature and sequence. – Error correcting. Notice that the clients run their programs in E independent machines/clouds. According to the conclusion of Ben-Or et al. [4], as long as less than one-third of clouds are malicious (do not follow the protocol possibly returning wrong results), the client can detect their actions by reconstructing the final result using Lagrange interpolation.

8: end for 9: R interpolates and computes a polynomial Q(x) = P (x) + f (x). 10: for i = 1 to E do 11: R sends to ui the coefficients qj of Q(x) with degree more than d∗ . 12: ui computes S = P (ui ) + f (ui ) − dj=d∗ +1 qj uj − g(ui ). 13: return S. 14: end for 15: end procedure Different from the original algorithm presented in [11], we use the random polynomials f (x) of degree d instead of d∗ . It is clear that adding f (x) to P (x) can hide all the coefficients of P (x) which prevent the reducer from obtaining any information about the secret s.

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