Cryptanalysis and improvement of two certificateless signature schemes
Hongzhen Du · Computer Engineering and Applications Journal · 2011
Security analyses of two certificateless signature schemes presented respectively by Su Wanli et al.and Zhang Yulei et al.are given.It is found that the two schemes are insecure against public-key replacement attacks and a forgery attack on the two schemes is given respectively.Two improved schemes for the two schemes are proposed.The improved schemes overcome the security flaws of original schemes,improve the security of the system,and retain some merits of the original schemes.