Ioannis Karydis, Spyros Sioutas, Peter Triantafillou,'s Algorithmic Aspects of Cloud Computing: First International 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 facets of Cloud Computing, ALGOCLOUD 2015, held in Patras, Greece, in September 2015 at the side of ALGO 2015.

The thirteen revised complete papers offered including 2 educational papers have been conscientiously reviewed and chosen from 37 preliminary submissions. They conceal a variety of subject matters in major tracks: algorithmic points of large-scale facts shops, and software program instruments and allotted architectures for cloud-based facts management.

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Therefore, we choose to represent every operand as a signed number. In order to perform subtraction in an easy way, we use two’s complement representation where subtraction can be transformed into addition. 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.

It is clear that only when ui = vi = 1, fi (α) × gi (α) is a secret share of 1, and otherwise it is a secret share of 0. Note that the hamming weight of unary representation is only 1, one can directly find the finial summation is at most 1 which conclude the result. Secret Shared Random Access Machine 23 Based on this observation, it is easy to compare a string using Accumulating Automata, which is a type of finite automata. Only when the string letters are exactly the same, the last node will be set to 1, otherwise this node will stay 0.

Implementation of SSS-Subleq. We then investigate the conditional branch that required in Subleq in secret shares form. It is difficult to compare two numbers directly since all the numbers are secret shared and the clouds never know the secrets. Here, we use two’s complement to represent the operands and using the sign bit to implement the comparison. In two’s complement, the sign bit of positive integer is 0 and negative integer is 1. Therefore, when implementing Subleq(A, B, C), we can use the sign bit of M em[B] − M em[A] to (blindly) decide whether to branch or not.

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