Cryptanalysis and improvement of some signature schemes with specified receiver
Qi You Xie · Journal of Zhejiang University(Science Edition) · 2008
Designated-receiver signature scheme is a kind of special signature, which the designated receiver can only check the validity of the signature. It is shown that WANG et al's authenticated encryption scheme for specified receiver, and MEI-HE's some signature schemes with specified receiver are all insecure against the insider forgery attack. In addition, the improved schemes are presented to overcome the weakness.