A Practical Identity-Based Signature Scheme

Many identity-based signature (IBS) schemes solving key escrow were proposed. But the updating of the private keys wasn’t discussed in these literatures. For the problem of key update, an identity-based key-insulated signature scheme with secure key updates has been proposed. But their scheme inherited the key escrow property. In this paper, we propose a new identity-based strong key-insulated signature scheme without key escrow. It makes the IBS scheme more applicable to the real world. After analyzing the security and the performance, an application example in E-passport passive authentication scenario is described.