: The group oriented (t,n) threshold digital signature schemes have some problems in that the group secret parameter will be revealed if any t or more shadowholders conspire together with each other and the efficience of verification is poor.

The scheme has the property of verification and can prevent inside member conspiracy attack.

YCH scheme is an efficient multi-secret sharing scheme based on two-variable one-way function and Shamir(t,n) threshold secret sharing scheme,but the scheme does not have the property of verification.

This paper gives the formal description of the two-party protocol,and discusses the security,authenticability and verifiability for two-praty protocols.

Analysis showed that this scheme achieved not only basic demands such as completeness,soundness,privacy,unreusability,but also extended demands such as receipt-freeness,universal verifiability and .

To definite the boundary, we should follow the testable principle, the cost-income principle, safe operation principle and applicability principle.

The design of integrated test platform,realtime simulation algorithms and the creditability validation of real-time simulation system were emphasized.