具有密文等值测试功能的公钥加密技术综述

Survey on public key encryption with equality test

作为解决云环境中多公钥加密计算问题的重要方法之一,密文等值测试技术可以实现对不同公钥加密的数据进行比较,使测试者在不对密文进行解密的前提下判断密文对应的明文是否相同。首先介绍了密文等值测试概念及其安全模型,总结了目前提出的6种授权模式所适用的场景以及对应的输入与输出;然后对比了密文等值测试技术与公钥可搜索加密技术的异同,阐述并分析了包括公钥、基于身份和基于属性在内的若干典型密文等值测试方案;最后讨论了密文等值测试的应用场景并对来来的研究进行展望。

As one of the important methods of solving the problem of computation over encrypted data under multiplepublic keys in cloud environment,public key encryption with equality test(PKEET)supports to check whethertwo ciphertexts encrypted under(possibly)different public keys contain the same message without decrypting theciphertexts.Definitions,security models and six types of authorization modes of PKEET are introduced and summarized.Besides,the relationship between PKEET and public key encryption with keyword search(PKES)is discussed.Several typical public-key,identity-based and attribute-based encryption with equality test schemes proposed recentlyare analyzed and compared.Furthermore,some application scenarios and research directions are discussed.