Abstract: With proxy signature, an original signer can delegate his signing authority to a proxy signer who can sign a message on behalf of the original one. Forward secure signature can solve the security problem of secret disclosure. There are only a few ID-based forward secure proxy signatures which need to be improved in efficiency. Combined with proxy signature and forward security, an efficient identity-based forward secure proxy signature scheme is proposed by using bilinear pairings. It shows that the proposed scheme’s efficiency is better than that of some existing ones under the condition of keeping the all kinds of security characteristics of forward security proxy signature, so is more propitious to applications in society.

Key words: identity-based, proxy signature, forward security

摘要： 在代理签名方案中，原始签名人能将其数字签名权力委托给代理签名人。前向安全的数字签名能解决密钥泄露问题。现有基于身份前向安全的代理签名文献数量少，效率也有待进一步提高。结合代理签名和前向安全，利用双线性映射，构造了一种高效的基于身份前向安全的代理签名方案。分析表明，该方案在保持了前向安全代理签名的各种安全特性的条件下，效率高于已有方案，更适合在实际中应用。

关键词: 基于身份, 代理签名, 前向安全