CCA-secure unidirectional proxy re-encryption in the adaptive corruption model without random oracles

• Main Authors: WENG, Jian, CHEN, Minrong, YANG, Yanjiang, DENG, Robert H., CHEN, Kefei
• Format: text
• Language: English
• Published: Institutional Knowledge at Singapore Management University 2010
• Subjects: Adaptive corruption model; Chosen-ciphertext attack; Unidirectional proxy re-encryption; Information Security
• Online Access: https://ink.library.smu.edu.sg/sis_research/4818; https://ink.library.smu.edu.sg/context/sis_research/article/5821/viewcontent/CCA_Secure_Oracles_2010_pv.pdf
• Institution: Singapore Management University

Proxy re-encryption (PRE), introduced by Blaze, Bleumer and Strauss in Eurocrypt’98, allows a semitrusted proxy to convert a ciphertext originally intended for Alice into an encryption of the same message intended for Bob. PRE has recently drawn great interest, and many interesting PRE schemes have been proposed. However, up to now, it is still an important question to come up with a chosen-ciphertext secure unidirectional PRE in the adaptive corruption model. To address this problem, we propose a new unidirectional PRE scheme, and prove its chosen-ciphertext security in the adaptive corruption model without random oracles. Compared with the best known unidirectional PRE scheme proposed by Libert and Vergnaud in PKC’08, our schemes enjoys the advantages of both higher efficiency and stronger security.