Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collusion-Resistant Identity-based Proxy Re-Encryption: Lattice-based
  Constructions in Standard Model   The concept of proxy re-encryption (PRE) dates back to the work of Blaze,
Bleumer, and Strauss in 1998. PRE offers delegation of decryption rights, i.e.,
it securely enables the re-encryption of ciphertexts from one key to another,
without relying on trusted parties. PRE allows a semi-trusted third party
termed as a ``proxy" to securely divert encrypted files of user A (delegator)
to user B (delegatee) without revealing any information about the underlying
files to the proxy. To eliminate the necessity of having a costly certificate
verification process, Green and Ateniese introduced an identity-based PRE
(IB-PRE). The potential applicability of IB-PRE sprung up a long line of
intensive research from its first instantiation. Unfortunately, till today,
there is no collusion-Resistant unidirectional IB-PRE secure in the standard
model, which can withstand quantum attack. In this paper, we present the first
concrete constructions of collusion-Resistant unidirectional IB-PRE, for both
selective and adaptive identity, which are secure in standard model based on
the hardness of learning with error problem.

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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: adap-org
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The categories of this paper are: astro-ph
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The categories of this paper are: physics
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The categories of this paper are: nlin
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph