A Provable Secure Identity-based Generalized Proxy Signcryption Scheme

Caixue Zhou ； Yue Zhang ； Lingmin Wang

《International Journal of Network Security》 20卷6期 (2018/11) Pp. 1183-1193

https://doi.org/10.6633/IJNS.201811_20(6).18

摘要

Generalized proxy signcryption (GPSC) can realize both proxy signature and proxy signcryption with only one key pair and one algorithm, which significantly improves the efficiency of a system with a large number of users, or with limited storage space, or whose functions may be changed. In this paper, we propose an identity-based GPSC scheme in the random oracle model by using bilinear pairings. Our scheme can perform public verification in proxy signcryption mode, resist proxy key exposure at- tacks, resist insider attacks and support self-delegation. What is more, it needs no secure channel between the original person and the proxy person. Under the adaptive chosen ciphertext, chosen identity and chosen warrant attacks, the confidentiality of our scheme can be reduced to the GBDH hard problem. Under the adaptive chosen message, chosen identity and chosen warrant attacks, the unforgeability of our scheme can be reduced to the GDH' hard problem. We compare our scheme in proxy signcryption mode with other identity-based proxy signcryption schemes that use bilinear pairings, and the results show that it is practical.

關鍵字

Bilinear Pairing ； Generalized Proxy Signcryption ； Proxy Signature ； Proxy Signcryption