Digitally signed document flexible sanitizing scheme based on bilinear maps

In 2001, the sanitizable signature was proposed by Steinfeld et al. Until now, many sanitizable signature schemes have been proposed. However, current sanitizable signature schemes are faced with the dishonest sanitizer or additional sanitizing problem due to the sanitizer can modify the signed document unrestrictedly. Therefore, a flexible sanitizable signature scheme based on bilinear mapping will be proposed in this paper. According to our security analysis, this proposed scheme is not only to keep the security requirement of sanitizable signature but also improve the disadvantage of related schemes.