An Efficient Secret Sharing Scheme with Multi-dealer
Xin Huang, Guohua Xiong
Journal of Digital Information Management, Vol. 11, No. 3, 2013.
DOI: 
Link: http://dline.info/fpaper/jdim/v11i3/14.pdf
Abstract:
In order to solve the problem that there is only one dealer in the existing secret sharing scheme, based on large integer factorization and discrete logarithm problems, a new sharing scheme with multi-dealer is proposed, which is combined with Deffie-Hellman key agreement protocol. And then, security and performance analysis is made in this scheme. As the secret can be recovered with the shadows provided by participants and it is computationally difficult to get the sub-keys from the shadows, the sub-keys can be reused to share the multisecret. The multiple dealers can commonly maintain the shared secret, which can be dynamically renewed by any dealers. The proposed scheme has higher safety and effectiveness over the existing schemes and is more practical.