中文摘要：

代理签名能够实现委托签名，环签名能够让签名者不泄露签名身份。根据两个环之间的联系，提出一种突破“一级”限制的多级代理环签名方案，验证者只能验证签名人和授权人所在的环，不能获知签名人和授权人的具体身份。理论分析证明该方案是安全的。

英文摘要：

Proxy signature can realize the delegate signature .Ring signature enables a signer to produce a signature without revealing identity .A multi‐level proxy ring signature scheme proposed that based on the relationships between the two rings breaks the limit of “one level” .The verifier just can verify the rings of the signer and the authorized person ,but can not obtain the identity of them .The theoretical analysis shows that the scheme is secure .