A Generic Construction of Accountable Decryption and Its Applications

• Main Authors: ZHOU, Xuhua, DING, Xuhua, CHEN, Kefei
• Format: text
• Language: English
• Published: Institutional Knowledge at Singapore Management University 2012
• Subjects: Information Security
• Online Access: https://ink.library.smu.edu.sg/sis_research/1671; http://dx.doi.org/10.1007/978-3-642-31448-3_24
• Institution: Singapore Management University

We propose a new cryptographic notion called accountable decryption by which, given a ciphertext, a decryptor proves both the correctness of his decryption and the plaintext authenticity to a public verifier. We define its security from three aspects: message confidentiality, soundness of verifiability and plaintext authenticity. Given any asymmetric or symmetric key encryption scheme, we propose a method to construct the corresponding accountable decryption scheme with provable security. To demonstrate its applications, we also present the constructions for predicate encryption and for public-key encryption with keyword search.