摘要
多方云计算是同态加密体制的重要应用.作为近年来的研究热点,同态加密可以直接对密文操作,其结果解密后相当于对明文进行同样操作.但是一般的同态加密方案只能作用于同一密钥加密的密文,而在多方计算的环境中,要对属于不同参与方的、用不同公钥加密后的密文进行运算,现有的同态加密方案无法满足这种应用.本文从代理重加密的思想出发,结合同态加密方案构造了一个同态代理重加密方案,该方案解决了由不同公钥加密的密文无法进行同态计算的问题,从而可以支持多方云计算.通过使用支持加法、乘法同态操作的类同态加密方案,实现了一个支持多方云计算的同态代理重加密方案.最后,提出了多方云计算的安全需求,并分析了该方案的安全性.
Multiparty cloud computation is an important application of homomorphic encryption schemes. Being the hot point in cryptography, homomorphic encryption can directly operate on ciphertexts, and the result can be decrypted into a value that is equal to the result of doing the same operation on plaintexts. But the ciphertexts to be operated must be encrypted under the same public key. Combining the idea of proxy re-encryption and homomorphic encryption, a homomorphic proxy re-encryption scheme is presented. Though this scheme, ciphertexts encrypted by different public keys can be input into a function, and get the evaluation. The scheme use an somewhat homomorphic proxy re-encryption scheme, and the latter can be used in multi-party cloud computation. Finally, we analyse the security requirement of multiparty cloud computation as well as security property of the scheme.
出处
《小型微型计算机系统》
CSCD
北大核心
2015年第8期1739-1742,共4页
Journal of Chinese Computer Systems
基金
国家自然科学基金项目(61272492
61103230
61103231)资助
陕西省自然科学基金基础研究项目(2012JM8014)资助
关键词
云计算
多方计算
代理重加密
同态加密
cloud computation
multiparty computation
proxy re-encryption
homomorphic encryption schemes
