Date Added: Dec 2011
In 2010, C.- F. Hsu, Q.Cheng, X.M.Tang and B.Zeng proposed an ideal linear multi-secret sharing scheme based on monotone span programs (for short HCTZ scheme). This paper mainly makes an analysis about the problems in HCTZ scheme. Meanwhile, the authors presents an efficient ideal multi-secret sharing scheme based on monotone span programs for a family of access structures. The new scheme effectively overcomes the deficiency of HCTZ scheme, and has the advantage of small calculation cost.