Signcryption Scheme with Threshold Shared Unsigncryption
Xiao Guo-zhen · 2003
A new signcryption scheme with threshold shared unsigncryption based on discrete logarithm is proposed,which is the integration of Jung et al.'s signcryption scheme and Shamir secret sharing scheme.In this scheme ,the sender generates the ciphertext of signature for a message by using his own secret key and transmits the ciphertext to a specified group of receivers in such a way that any t of n receivers can unsigncrypt the message and any t-1or fewer receivers can not unsigncrypt the message.As compared to Hsu and Wu ’s authenticated encryption scheme with(t,n)shared verification,the proposed scheme has the following advantages:it is more efficient for signature generation and encryption;it can detect malicious verifiers cheating others.