Based on the idea of signcryption, an ID-based designated recipient group signcryption scheme without trusted PKG (private key generator) was proposed by improving an ID-based group signature scheme.

• 摘要利用签密的思想，对基于身份的群签名方案进行改进，提出无可信PKG（私钥生成中心）的基于身份的指定接收者群签密方案。