一个单方加密-多方解密的公钥加密方案

A Public Key Encryption Scheme with One-Encryption and Multi-Decryption

以Shamir的门限秘密共享方案和对称密码算法为基础,基于椭圆曲线上的双线性变换提出了一个具有多个解密者的单方加密-多方解密公钥加密方案.在该方案中,消息发送者具有一个唯一的加密密钥,而每个消息接收者都具有不同的解密密钥.使用加密密钥所加密的密文可以被任意解密密钥所解密,得到同样的明文信息.分析发现,该加密方案不仅安全有效,同时,它还具备前向保密性,即使加密者的主密钥泄露,也不会影响之前加密信息的安全性.文中方案具有非常重要的应用价值,尤其可以用来实现安全广播/组播和会议密钥的安全分发.

Based on Shamir＇s threshold secret sharing scheme and the secure symmetric encryption algorithm,a one-encryption and multi-decryption public key encryption scheme is proposed on bilinear pairing on elliptic curve.In the proposed scheme,the message sender has a unique encryption key,while each message recipient has a different decryption key.A message encrypted using the encryption key can be correctly decrypted by any decryption key.Analysis show that the proposed scheme is a secure and efficient one,and at the same time,this scheme has the property of forward secrecy.Even if the master key of the sender is disclosed,the security of the encrypted messages is not affected.This scheme plays an important role in many applications,especially in the secure broadcast/multicast and secure distribution of conference keys.