Affiliations: Department of Computer Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China | School of Computer Engineering, Huaiyin Institute of Technology | Shanghai Key Laboratory of Scalable Computing and System, Shanghai Jiao Tong University | Department of Computer Science and Technology, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China | College of Science, Hohai University, 1 Xikang Road, Nanjing 210098, China, e-mail: [email protected], [email protected], [email protected], [email protected], [email protected]
Abstract: Key-insulated cryptography is an important technique to protect private keys in identity-based (IB) cryptosytems. Despite the flurry of recent results on IB key-insulated encryption (IBKIE) and signature (IBKIS), a problem regarding the security and efficiency of practicing IBKIE and IBKIS as a joint IB key-insulated signature/encryption scheme with a common set of parameters and keys remains open. To deal with the above question, we propose an identity-based key-insulated signcryption (IBKISC) scheme. Compared with the Sign-then-Encrypt (StE) and Encrypt-then-Sign (EtS) using IBKIE and IBKIS in the standard model, our proposed IBKISC scheme is the fastest with the shortest ciphertext size.
Keywords: key-insulated, signcryption, standard model
Journal: Informatica, vol. 23, no. 1, pp. 27-45, 2012
