An Efficient Cross-Domain Lattice-Based Direct Anonymous Authentication Scheme

The existing lattice-based direct anonymous authentication (LDAA) scheme has not considered the cross-domain authentication problem, and it has the problem of low efficiency. In response to the above problems, this paper proposes an efficient cross-domain lattice-based direct anonymous authentication scheme. Firstly, we design a new cross-domain mechanism, which adopts the idea of “space for time” and stores the trust relationship in advance to shorten the time required for cross-domain authentication. Secondly, some steps in the sign process are optimized through a matrix transformation, which improves the overall efficiency of the authentication. Finally, through theoretical analysis and specific experiments, the security and superior performance of proposed scheme are verified.