高效的基于身份在线/离线签密方案

摘要

基于身份密码体制提出一个在线/离线签密方案.相比已有的方案,该方案在线、离线计算效率高、离线存储量小、在线密文长度短.并且,在l-BDHI难题和l-SDH难题假设下,该方案是随机预言模型下可证安全的.%We proposed an efficient identity based online/ offline signcryption scheme with shorter ciphertext Under the l-BDHI assumption and Z-SDH assumption, the scheme can be proved secure in the random oracle model.