A revised LKK proxy blind signature scheme

In 1996, the concept of proxy signature was introduced by Mambo, Usuda and Okamoto in M. Mambo et al. (1996). A strong proxy signature scheme has been introduced in B. Lee et al. (2001), which we call LKK (B. Lee, H. Kim, K. Kim) scheme. In Z. Dong et al. (2003), the authors showed that the LKK scheme is vulnerable to their attack. In this paper, based on the vulnerability of the LKK scheme and blind Schnorr signature scheme, we propose a revised proxy signature and a proxy blind signature scheme. The basic idea is to propose the revised scheme resisting their attack and to make it difficult for the original signer to delete a delegation value