Abstract
Due to the special requirements of the mobile code system, Shieh et al. (see IEEE Trans. Veh. Technol., vol.49, p.1464-73, July 2000) proposed some multisignature schemes based on a new digital signature scheme with message recovery. One major characteristic of these schemes is to avoid using one-way hash functions and message redundancy schemes. However, this causes some security flaw. An attack is proposed to show that the underlying signature scheme is not secure. To overcome the attack, the message redundancy schemes may be still used.
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