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In 2007, Liu proposed an improvement of Shieh et al. multi-signature scheme in mobile code system. There exist forgery attacks of multiplicative algebra method in his scheme. It is therefore insecure for his improvement. In this paper, we pointed out who do a forge attack successfully.
In 2000, Shieh et al. proposed a digital multi-signature scheme for authenticating the delegates of mobile code systems. Later, Hwang and Li showed that a forgery attack against the Shieh et al. scheme could be successful. Chang and Chang improved the Shieh et al. scheme. Their proposed scheme effectively defends against potential attacks as pointed out by Hwang-Li. Later, Zhang proved that the Chang-Chang...
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