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DEVELOPMENT ON SECURITY MODELS FOR PROXY RE-ENCRYPTION SCHEMES
Keywords:
proxy re-encryption, security models, public keys encryption, access delegation, cryptography.DOI:
https://doi.org/10.17654/0972555524001Abstract
A proxy re-encryption is a type of public key encryption where a proxy is given the ability to transform ciphertext for one user into ciphertext for another user, without having access to either the plaintext or the decryption keys.
Proxy re-encryption schemes, since their introduction in 1998 by Blaze et al. [3], are often proposed with specific security notions. We propose here to recall the most commonly used security notions and to propose standard security models for security analysis of proxy re-encryption scheme.
In this article, we consider the goals of confidentiality and non-malleability, each in the context of a parametric family of attack models. For each of the resulting pairs of definitions, we prove either an implication or a separation from the other security definitions.
Received: September 1, 2023
Accepted: October 27, 2023
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