Asymmetry Helps: Improved Private Information Retrieval Protocols for Distributed Storage
Asymmetry Helps: Improved Private Information Retrieval Protocols for Distributed Storage
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不对称有助于:改进分布式存储的私有信息检索协议
DOI:
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发表时间:
2018
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通讯作者:
A. G. Amat
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文献类型:
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作者:
Hsuan;Siddhartha Kumar;E. Rosnes;A. G. Amat
We consider private information retrieval (PIR) for distributed storage systems (DSSs) with noncolluding nodes where data is stored using a non maximum distance separable (MDS) linear code. It was recently shown that if data is stored using a particular class of non-MDS linear codes, the MDS-PIR capacity, i.e., the maximum possible PIR rate for MDS-coded DSSs, can be achieved. For this class of codes, we prove that the PIR capacity is indeed equal to the MDS-PIR capacity, giving the first family of non-MDS codes for which the PIR capacity is known. For other codes, we provide asymmetric PIR protocols that achieve a strictly larger PIR rate compared to existing symmetric PIR protocols.