Cryptology ePrint Archive: Report 2021/276

Improved Proxy Re-encryption Scheme for Symmetric Key Cryptography

Amril Syalim and Takashi Nishide and Kouichi Sakurai

Abstract: A proxy re-encryption scheme can be executed by a semi-trusted proxy, so that we can transform a ciphertext encrypted with a key to another ciphertext encrypted with different key without allowing the proxy to access the plaintext. A method to implement a secure proxy re-encryption is by first converting the plaintext to an intermediate form by using an all or nothing transform (AONT). In this paper, we describe an improved proxy re-encryption scheme for symmetric cipher by advocating the usage of a variant of the AONT function in the proxy re-encryption scheme. We show that the scheme secure under Chosen Plaintext Attack (CPA) for all possible types of attackers.

Category / Keywords: secret-key cryptography / proxy re-encryption

Original Publication (in the same form): IEEE IWBIS 2017

Date: received 4 Mar 2021

Contact author: amril syalim at cs ui ac id

Available format(s): PDF | BibTeX Citation

Version: 20210304:133104 (All versions of this report)

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