Mar 26, 2014 we construct two efficient identity based encryption ibe systems that admit selective identity security reductions without random oracles in groups equipped with a bilinear map. Secure identity based encryption without random oracles dan boneh. It is natural to ask whether secure ibe systems can exist in the standard model, i. Waters, efficient identitybased encryption without random oracles, advances in cryptologyeurocrypt, lncs 3494 springer, berlin, 2005 pp. Identity based encryption ibe is an exciting alternative to publickey encryption, as ibe eliminates the need for a public key infrastructure pki.
We construct two efficient identitybased encryption ibe systems that. The main shortcoming of the proposed system is that it is ine. Efficient selective identity based encryption without random oracles authors. Secure publickey encryption scheme without random oracles. Identity based signcryption schemes without random oracle. Efficient selectiveid secure identity based encryption without. Efficient selective identitybased encryption without. Efficient identitybased broadcast encryption without.
Realizing fully secure ibe and hibe under simple assumptions. Our system demonstrates that fully secure ibe systems can exist without random oracles. Security is based on the decisional version of the bilinear di. We present an identitybased cryptosystem that features fully. Request pdf efficient selectiveid secure identity based encryption without random oracles. Anonymous hierarchical identitybased encryption without random oracles xavier boyen1 and brent waters2 1 voltage inc. Idbased encryption, or identitybased encryption ibe, is an important primitive of idbased cryptography. In this work, we present a generic framework for constructing efficient signature schemes, ring signature schemes, and identity based encryption schemes, all in the standard model without relying on random oracles. Boneh and franklin 4 did not appear until much later. Cocks coc01 describes another construction using quadratic residues. We propose a new efficient identity based broadcast encryption scheme without random oracles and prove that it achieves selective identity, chosen plaintext security. Identitybased encryption with efficient revocation.
Anonymity of identitybased encryption ibe means that given a ciphertext, one cannot distinguish the target identity from a random identity. Reducing trust in the pkg in identity based cryptosystems. Download pdf fuzzy identity based encryption by amit sahai and brent waters proceedings of eurocrypt 2005 download pdf efficient identitybased encryption without random oracles by brent waters proceedings of eurocrypt 2005 download pdf a convenient method for securely managing passwords by by j. We first present our ibe construction and reduce the security of our scheme to the decisional. Efficient identitybased encryption without random oracles brent waters stanford universtiy additional slides contributed by dan boneh. The same holds for several other identity based systems featuring signatures cc03, key exchange sok00, hierarchical identities gs02, and signcryption boy03. Efficient anonymous identity based broadcast encryption without random oracles article in international journal of digital crime and forensics 62. In table 2, we exclude chkbbe scheme as it depends on the efficiency of a onetime strongly signature scheme without random oracles. Furthermore, current definition cannot express the degree of anonymity. One exception is an elegant system due to cocks which. This means that a sender who has access to the public parameters of the system can encrypt a message using e. Anonymous hierarchical identitybased encryption without.
In proceedings of eurocrypt 2005, lncs 3494, 2005, pp. Efficient identitybased encryption without random oracles core. We construct two efficient identitybased encryption ibe systems that admit selectiveidentity security reductions without random oracles in groups equipped with a bilinear map. Signcryption is a cryptographic primitive which performs. Our scheme is constructed based on bilinear diffiehellman inversion assumption and it is a good efficient hybrid encryption scheme, which achieves o1size ciphertexts, public. We present the first efficient identitybased encryption ibe scheme that is fully secure without random oracles. An identitybased strongly unforgeable signature without. The first efficient hibe scheme to be provably secure without random oracles is the bb1 system of boneh and boyen.
In this paper, motivated by waters identity based encryption scheme, we propose the first identity based signcryption scheme without random oracles. In this paper, motivated by waters identity based encryption scheme, we propose the first. In proceedings of eurocrypt, lecture notes in computer science, springer, 2005, 114127. The ability to use identities as public keys avoids the need to distribute public key certi. Efficient selective identitybased encryption without random oracles. Anonymous identitybased encryption scheme without random. The senders using an ibe do not need to look up the public keys and the corresponding certificates of the receivers, the identities e. Identitybased encryption ibe is an exciting alternative to publickey encryption, as ibe eliminates the need for a public key infrastructure pki. E cient selective identitybased encryption without random. In this model the adversary must commit ahead of time to the identity that it intends to attack. This is the first hibpre scheme up to now, and our scheme satisfies unidirectionality, noninteractivity and permits multiple reencryptions.
Efficient identity based signatures secure in the standard. In this section, we construct a strongly unforgeable idbased signature ibs motivated from waterss ibe scheme, the security of which is reduced to the hardness of the cdh problem in. As a critical component of grid security, secure and efficient grid authentication needs to be well addressed. Furthermore, chkbbe scheme involves signature key generation and signature generation in encryption and signature verification in decryption, which results in relatively slower than the other schemes. As such it is a type of publickey encryption in which the public key of a user is some unique information about the identity of the user e. Chosen ciphertext secure public key threshold encryption without random oracles. Citeseerx document details isaac councill, lee giles, pradeep teregowda.
We construct two efficient identity based encryption ibe systems that are selective identity secure without the random oracle model selective identity secure ibe is a slightly weaker security model than the standard security model for ibe. Lncs 3027 efficient selectiveid secure identitybased. Practical identitybased encryption without random oracles. In this paper, we thoroughly discuss the anonymity of ibe systems. Efficient selectiveid secure identity based encryption without random oracles. Selective identity secure ibe is a slightly weaker security model than the standard security model for ibe. The notion of hierarchical identitybased encryption was. Efficient anonymous identitybased broadcast encryption without random oracles. In both systems, encryption requires no bilinear map computation and decryption requires at most two.
The notion of identity based encryption ibe was introduced by shamir sha84 as. Selectiveidentity secure ibe is a slightly weaker security model than the standard security model for ibe. Our identitybased signature without random oracles 4. Finally, our proof of cca2 security, which has more in common with the security proof for the cramershoup encryption scheme than with security proofs for other ibe systems, may be of independent interest. Efficient selectiveid secure identitybased encryption without random oracles conference paper in lecture notes in computer science 244.
Spaceefficient identity based encryption without pairings. E cient selective identity based encryption without random oracles dan boneh y xavier boyen z march 21, 2011 abstract we construct two e cient identity based encryption ibe systems that admit selective identity security reductions without random oracles in groups equipped with a bilinear map. Efficient anonymous identity based broadcast encryption. We present the first efficient identity based encryption ibe scheme that is fully secure without random oracles. In this model the adversary must commit ahead of time to the identity that it intends to attack, whereas in. In this model the adversary must commit ahead of time to the identity that. Practical identitybased encryption without random oracles iacr. This contrasts with the two selective identity constructions from bb04a, which are very simple and practical even when scaled for full ibe security. Efficient anonymous identity based broadcast encryption without random oracles. Efficient selectiveid secure identity based encryption. An efficient forwardsecure publickey encryption scheme.
However, all the schemes were proven secure in the random oracle model which has received a lot of criticism that the proofs in the random oracle model are not proofs. Secure identity based encryption without random oracles dan boneh1. School of communication and information engineering, shanghai university, shanghai 200072, china. We present the first efficient identity based encryption ibe scheme that is secure in the full model without random oracles. We first present our ibe construction and reduce the security of our scheme to the decisional bilinear diffiehellman bdh problem. In this paper, we propose a hierarchical identity based proxy re encryption hibpre scheme which achieves indpridcca2 security without random oracles. Boneh and boyen then proposed an efficient selectiveid secure idbased encryption without random oracles and also an inefficient variant that is proven to be indcca secure in the standard. Broadcast encryption provides a method of secure multireceiver communications, where a broadcaster can encrypt a message for a set s of users who are. We construct two efficient identity based encryption ibe systems that admit selective identity security reductions without random oracles in groups equipped with a bilinear map. We start by abstracting the recent work of hohenberger and waters crypto 2009, and specifically their prefix method. We propose a new efficient identitybased broadcast encryption scheme without random oracles and prove that it achieves selective identity, chosen plaintext security. Efficient selective identitybased encryption without random oracles authors. Efficient selectiveid secure identitybased encryption. Shamir, identitybased cryptosystems and signature schemes, advances in cryptologycrypto, lncs 196 springer, berlin, 1984 pp.
Boneh and boyen then proposed an efficient selectiveid secure id based encryption without random oracles and also an inefficient variant that is proven to be indcca secure in the standard. Efficient identitybased broadcast encryption without random. We first present our ibe construction and reduce the security of our scheme to the decisional bilinear diffiehellman problem. Public key encryption scheme where public key is an arbitrary string id. We construct two efficient identity based encryption ibe systems that are selective identity secure without the random oracle model. Efficient identitybased encryption without random oracles. Signcryption is a cryptographic primitive which performs encryption and signature in a single logical step with the cost lower than signaturethen encryption approach in this paper we gave attacks on confidentiality and unforgeability of two identity based signcryption schemes without random oracles. A framework for efficient signatures, ring signatures and. We construct two efficient identity based encryption ibe systems that are selective identity secure without the random oracle model in groups.
We present the first efficient identitybased encryption ibe scheme that is secure in the full model without random oracles. E cient selective identitybased encryption without random oracles dan boneh y xavier boyen z march 21, 2011 abstract we construct two e cient identitybased encryption ibe systems that admit selectiveidentity security reductions without random oracles in groups equipped with a bilinear map. Sep 15, 2010 we construct two efficient identity based encryption ibe systems that admit selective identity security reductions without random oracles in groups equipped with a bilinear map. Efficient selective identitybased encryption without random. Efficient anonymous identitybased broadcast encryption. We found that the current definition of anonymity is obscure to describe some ibe systems, such as gentry ibe system. Anonymous identitybased encryption scheme without random oracles. Identity based signcryption scheme without random oracles. Efficient identitybased broadcast encryption without random oracles article pdf available in journal of computers 53 march 2010 with 66 reads how we measure reads. By dan boneh and xavier boyen in advances in cryptology eurocrypt 2004, volume 3027 of lecture notes in computer science, pages 223238. Secure identity based encryption without random oracles applied.
Department of computer science and engineering, shanghai jiao. Grid authentication from identitybased cryptography. Pdf efficient identitybased broadcast encryption without. Secure identity based encryption without random oracles. Id based encryption, or identity based encryption ibe, is an important primitive of id based cryptography.
Efficient identitybased signatures secure in the standard. In advances in cryptology eurocrypt 2004, volume 3027 of lecture notes in computer science, pages 223238. Grid authentication from identitybased cryptography without. New identitybased short signature without random oracles.
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