Cryptanalysis of Efficient Identity Based Signature/Signcryption Schemes in the Standard Model

Wang, Xu An; Zhong, Weidong; Luo, Haining

doi:10.1109/iptc.2010.111

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…In 2003, Boyen et al suggested an

ℐℬ SC

essentially serving multipurpose, and Chow et al proposed provably secure one. In 2007, Yanli designed an advanced

ℐℬ SC

in this model, but Wang et al crytanalyze it and found it is not secure in the given model (ST model). In 2009, Yu et al suggested a new

ℐℬ SC

in ST model, but Zhang et al studied this scheme and justify it does not support IND‐CCA2 security in ST model.…”

Section: Introductionmentioning

confidence: 99%

Understanding signcryption security in standard model

Dharminder

Mishra

2020

Security and Privacy

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Signcryption is an advanced technique that combines both signature and encryption in one step which costs lower than any ordinary signature-then-encryption technique. Many ID-based signcryption () techniques have been constructed, but they are considered secure in the random Oracle (RO) model, where the proofs in this environment are criticized as it always depends on the assumption that Oracle is truly random. This assumption of RO is not possible in reality. Therefore, many of the ID-based signcryptions were proposed in the widely accepted standard model. As signcryption schemes have much important application, the verification of their correctness, security, and performance are required. In this article, we have discussed two important security features in the standard model under decision bilinear Diffie-Hellman (DBDH) and computational Diffie-Hellman(CDH) assumptions, namely, (a) indistinguishable against chosen cipher text attack and (b) indistinguishable against chosen-plaintext attack. To understand the security of existing schemes, we present cryptanalysis, which illustrates weak security.The study on performance is also performed to analyze the communication and computational efficiency. The study of performance and security analysis helps us to understand the requirement of signcryption scheme in standard model. K E Y W O R D Sauthentication, elliptic curve, security, signcryption, standard model

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“…In 2003, Boyen et al suggested an

ℐℬ SC

essentially serving multipurpose, and Chow et al proposed provably secure one. In 2007, Yanli designed an advanced

ℐℬ SC

in this model, but Wang et al crytanalyze it and found it is not secure in the given model (ST model). In 2009, Yu et al suggested a new

ℐℬ SC

in ST model, but Zhang et al studied this scheme and justify it does not support IND‐CCA2 security in ST model.…”

Section: Introductionmentioning

confidence: 99%

Understanding signcryption security in standard model

Dharminder

Mishra

2020

Security and Privacy

View full text Add to dashboard Cite

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“…The second author is the corresponding author. This paper is an extended work of [29], [30] broken in unexpected way, and thus they should be more cautious on which cryptographic scheme can be employed in practical applications.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Improvements of Several (H)IBS/IBSC/PRBE Schemes

Zhang¹,

Wang²,

Yang³

2013

JCP

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Constructing efficient (Hierarchical) identity based signature/signcryption ((H)IBS/IBSC) schemes in the standard model with full security remain as open problems for a long time. Ren et al. constructed efficient (H)IBS/IBSC schemes with full security without random oracle in IS-DPE'07 and Chinacrypt'08,. They claimed their schemes can be proved to simultaneously achieve high efficiency, short public parameters and a tight reduction. But we shall show their schemes are not secure. Furthermore, we give improvements to these schemes which can resist the proposed attack. Proxy re-encryption is a primitive which allows the transformation from A's ciphertext to be B's ciphertext by using proxies, without the proxy knowing the corresponding plaintexts or secret keys of A or B. Proxy broadcast re-encryption aims at transforming ciphertext from one user to a group, which is a generalization of proxy re-encryption. Recently, Sun et al. proposed a CCA-secure unidirectional proxy broadcast re-encryption in the standard model, we also show their scheme has some flaws.

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ID Based Signcryption Scheme in Standard Model

et al. 2012

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Abstract. Designing an ID based signcryption scheme in the standard model is among the most interesting and important problems in cryptography. However, all the existing systems in the ID based setting, in the standard model, do not have either the unforgeability property or the indistinguishability property or both of them. In this paper, we present the first provably secure ID based signcryption scheme in the standard model with both these properties. The unforgeability property of this scheme is based on the hardness of Computational Diffie-Hellman problem and the indistinguishability property of this scheme is based on the hardness of Decisional Bilinear Diffie-Hellman problem. Our scheme is strongly unforgeable in the strong attack mode called insider security. Moreover, our scheme possess an interesting property called public verifiability of the ciphertext. Our scheme integrates cleverly, a modified version of Waters' IBE and a suitably modified version of the ID based signature scheme in the standard model proposed by Paterson et al. However, our security reductions are more efficient. Specifically, while the security reductions for indistinguishability is similar to the bounds of Waters' scheme, the unforgeability reductions are way better than the bounds for Paterson et al.'s scheme.

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Cryptanalysis of Efficient Identity Based Signature/Signcryption Schemes in the Standard Model

Cited by 4 publications

References 14 publications

Understanding signcryption security in standard model

Understanding signcryption security in standard model

Analysis and Improvements of Several (H)IBS/IBSC/PRBE Schemes

ID Based Signcryption Scheme in Standard Model

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