PROJECT TITLE :

Provably secure convertible multi-authenticated encryption scheme

ABSTRACT :

In 2009, Tsai proposed an efficient convertible multi-authenticated encryption (CMAE) scheme. However, the author shows that his theme is distinguishable underneath adaptive chosen-message attack, and that the designated verifier will generate the signature of the identical message for alternative verifiers. Since no formal model of CMAE has been presented in the literature, the author presents the primary complete formal model of CMAE. Then, a brand new scheme is proposed. The proposed theme is provably secure in the random oracle model.