改进的身份基在线离线加密方案
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摘要
现有的基于指数逆模型的身份基在线离线加密方案的在线加密效率最高,密文长度最短,但是用户私钥由身份唯一确定,在抗私钥泄露攻击下比较脆弱。针对这个问题,将在线离线技术与Boneh等人提出的身份基加密相结合,提出了一个改进的身份基在线离线加密方案。该方案在保持原来指数逆模型在线加密效率前提下,给用户私钥中增加了一个随机参数,改进了私钥由用户身份唯一确定的弱点,从而大大提高了在抗私钥泄露攻击下的安全性。
The existing identity Based online offline encryption(IBOOE) schemes in the exponent inverse model are of the highest online computation efficiency and the shortest ciphertxt size. However the user private key is fully determined by the user identity, which leads the schemes vulnerable against the private key leakage attack. This paper introduces the online offline technique into Boneh etc's identity based encryption and proposes a improved IBOOE. Compared with the previous IBOOE in the exponent inverse model, it is of the same efficiency while adding a random number into the private key. Thus we remedy the weakness of the previous private key and our scheme strengthen the security against the private key leakage attack greatly.
The existing identity Based online offline encryption(IBOOE) schemes in the exponent inverse model are of the highest online computation efficiency and the shortest ciphertxt size. However the user private key is fully determined by the user identity, which leads the schemes vulnerable against the private key leakage attack. This paper introduces the online offline technique into Boneh etc's identity based encryption and proposes a improved IBOOE. Compared with the previous IBOOE in the exponent inverse model, it is of the same efficiency while adding a random number into the private key. Thus we remedy the weakness of the previous private key and our scheme strengthen the security against the private key leakage attack greatly.
引文
[1]SHAMIR A.Identity-based cryptosystems and signatureschemes[C]//Advances in Cryptology-Proceedings of CRYP-TO’84,LNCS 196.Berlin:Springer-Verlag,1984:47-53.
[2]BONEH D,BOYEN X.Efficient selective-ID secure identitybased encryption without random oracles[C]//Proceedings ofthe Advances in Cryptology-Eurocrypt’04.Berlin:Springer-Verlag,2004:223-238.
[3]GUO F,MU Y,CHEN Z.Identity-Based online/offline encryp-tion[C]//Proceedings of Financial Cryptography and Data Secu-rity 2008.Cozumel,Mexico,2008:247-261.
[4]CHOW S,LIU J K,ZHOU J Y.Identity-Based online/OfflineKey Encapsulation and Encryption[C]//Proceedings of ASI-ACCS’11.Hong Kong,China,2011:52-60.
[5]王占君,李杰,马海英,等.完全安全的身份基在线/离线加密[J].计算机应用,2014,34(12):3458-3461.
[6]王占君,马海英,王金华.完全安全的等级身份基在线/离线加密[J].计算机应用,2015,35(9):2522-2526.
[7]马海英,曾国荪,王占君,等.高效可证明安全的基于属性的在线/离线加密机制[J].通信学报,2014,35(7):104-112.
[8]SUSAN H,WATERS B.Online/offline attribute-based encryp-tion[C]//In Proceedings of PKC 2014,Buenos Aires,Argenti-na LNCS 8383,2014:293-310.
[9]Sakai R,Kasahahara M.ID based cryptosystems with pairingon elliptic curve.IACR Cryptology eprint Archive 2003,54.
[10]王占君,马海英,王金华.attribute Based online offline en-cryption with outsourcing decryptin[J].Journal of informationscience and engineering.2016,32(6):1595-1608.
[2]BONEH D,BOYEN X.Efficient selective-ID secure identitybased encryption without random oracles[C]//Proceedings ofthe Advances in Cryptology-Eurocrypt’04.Berlin:Springer-Verlag,2004:223-238.
[3]GUO F,MU Y,CHEN Z.Identity-Based online/offline encryp-tion[C]//Proceedings of Financial Cryptography and Data Secu-rity 2008.Cozumel,Mexico,2008:247-261.
[4]CHOW S,LIU J K,ZHOU J Y.Identity-Based online/OfflineKey Encapsulation and Encryption[C]//Proceedings of ASI-ACCS’11.Hong Kong,China,2011:52-60.
[5]王占君,李杰,马海英,等.完全安全的身份基在线/离线加密[J].计算机应用,2014,34(12):3458-3461.
[6]王占君,马海英,王金华.完全安全的等级身份基在线/离线加密[J].计算机应用,2015,35(9):2522-2526.
[7]马海英,曾国荪,王占君,等.高效可证明安全的基于属性的在线/离线加密机制[J].通信学报,2014,35(7):104-112.
[8]SUSAN H,WATERS B.Online/offline attribute-based encryp-tion[C]//In Proceedings of PKC 2014,Buenos Aires,Argenti-na LNCS 8383,2014:293-310.
[9]Sakai R,Kasahahara M.ID based cryptosystems with pairingon elliptic curve.IACR Cryptology eprint Archive 2003,54.
[10]王占君,马海英,王金华.attribute Based online offline en-cryption with outsourcing decryptin[J].Journal of informationscience and engineering.2016,32(6):1595-1608.