强(t,N)密钥隔离下的盲签名方案

Strong (t, N) Key-insulated Blind Signature Scheme

在安全服务中密钥泄漏会导致严重后果,密钥隔离的思想是解决这个问题的一种方法。基于可证安全的Okamoto-Schnorr盲签名方案和强密钥隔离的思想,提出了强(t,N)密钥隔离下的盲签名方案,该方案比前向安全的盲签名方案提高了安全保证。在随机神谕模型下,通过Pointcheval和Stern提出的分叉引理,攻破该方案等价于解离散对数问题。

Key exposure problem turns out to be very serious in security services. Key-insulated is way to address this issue. Basing on the provable secure Okamoto-Schnorr blind signature scheme and key-insulated model, strong （t, N） key-insulated blind signature scheme is proposed, the scheme is stronger security than forward secure blind signature scheme. In the random oracle model, using forking lemma proposed by Pointcheval and Stern, breaking of the scheme is equivalent to solve discrete logarithm problem.