[Resource Topic] 2015/112: Re-encryption Verifiability: How to Detect Malicious Activities of a Proxy in Proxy Re-encryption

Resource Public-key cryptography
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Welcome to the resource topic for 2015/112

Title:
Re-encryption Verifiability: How to Detect Malicious Activities of a Proxy in Proxy Re-encryption

Authors: Satsuya Ohata, Yutaka Kawai, Takahiro Matsuda, Goichiro Hanaoka, Kanta Matsuura

Abstract:

In this paper, we introduce a new functionality for proxy re-encryption (PRE) that we call re-encryption verifiability. In a PRE scheme with re-encryption verifiability (which we simply call verifiable PRE, or VPRE), a receiver of a re-encrypted ciphertext can verify whether the received ciphertext is correctly transformed from an original ciphertext by a proxy, and thus can detect illegal activities of the proxy. We formalize the security model for a VPRE scheme, and show that the single-hop uni-directional PRE scheme by Hanaoka et al. (CT-RSA 2012) can be extended to a secure VPRE scheme.

ePrint: https://eprint.iacr.org/2015/112

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