Abstract: In trusted omputing environment, to solve the problem of binary attestation scheme proposed by the trusted computing group(TCG)，this paper proposed a new property-based attestation scheme. Firstly, this paper introduced the ideas of PISA and the security model of PISA-I3I3十，secondly,based on improved I3I3+ signature technology,presented a concrete construction of PISA-I3I3} scheme,and compared the scheme with other PISA schemes,finally,in oracle random model,proved the PBA-BI3} scheme meets configuration privacy and unforgcability.

Key words: Trusted computing, Property-based attestation, BB+ signature