中文摘要：

Shieh等人提出了一种适用于移动代码的并列多签名和顺序多签名方案,但是,Hwang、Chang分别对所依据的基本签名方案提出了伪造攻击。对Shieh的并列多签名方案提出一种伪造攻击,接着提出新的没有使用单向Hash函数和消息冗余模式的基本签名方案,并提出了新的顺序多签名和并列多签名方案。该方案既具有Shieh方案的优点又克服了其不足,还可抵抗已知的伪造攻击。

英文摘要：

Shieh et al proposed the parallel digital multisignature scheme and the serial digital multisignature scheme which is suitable for mobile code. However, Hwang and Chang presented a forgery attack on the underlying digital signature scheme which is relied on respectively. Firstly, a forgery attack on Shieh＇s parallel digital multisignature scheme is proposed. Secondly, a new type of basic signature scheme without one-way hash function and message redundant is proposed. A new serial and a parallel digital multisignature scheme are put forward. The scheme both possess the advantage of Shieh scheme and avoid its disadvantage, and then it can resist on forgery attack which is known for us.