A Multi-service Oriented Traitor Tracing Scheme on LIFP
Zhang Xue-jun①; Yu Guo-lin②; Zhou Li-hua①
①Ministry of Edu. Key Lab. of Computer Network and Info. Security, Xidian Univ., Xi’an 710071, China;②The Second Northwest Institute Ethnic Minority, Yinchuan 750021, China
Abstract:A multi-service traitor tracing scheme on LIFP(Large Integer Factoring Problem) is proposed,the essential idea of which is that an equation based on LIFP is constructed and a parameter is introduced to transfer service private-key. In decryption procedure, the session key can be obtained by the equation and the service private-key. Compared with the existing two traitor tracing schemes, this scheme has many advantages such as multi-service, black-box traitor tracing, ciphertexts of constant size, adding or revoking users, forward-security and backward-security. Furthermore, its whole capabilities are better than that of the existing ones.