Download PDF by Yuliang Zheng (auth.), Alexander W. Dent, Yuliang Zheng: Practical Signcryption

By Yuliang Zheng (auth.), Alexander W. Dent, Yuliang Zheng (eds.)

ISBN-10: 3540894098

ISBN-13: 9783540894094

ISBN-10: 354089411X

ISBN-13: 9783540894117

In today’s global, information has to be despatched all over the world affordably and securely, and that calls for starting place authentication, integrity safeguard, and confidentiality – the recipient of a message will be in a position to make sure who despatched the message, be certain that the message has now not been replaced en path, and make sure the knowledge arrives with no need been learn via somebody else. the second one editor invented signcryption, a space of cryptography that experiences structures that at the same time offer foundation authentication, integrity security and confidentiality for information. Signcryption schemes mix the positive aspects of electronic signature schemes with these of public-key encryption schemes and objective to supply safety promises in a manner that's provably right and considerably much less computationally pricey than the “encrypt-then-sign” technique most ordinarily followed in public-key cryptography. this is often the 1st accomplished e-book on signcryption, and brings jointly major authors from the sector of cryptography in a dialogue of the various tools for development effective and safe signcryption schemes, and the ways that those schemes can be utilized in useful structures. Chapters care for the speculation of signcryption, equipment for developing sensible signcryption schemes, and some great benefits of utilizing such schemes in useful occasions. The ebook may be of gain to cryptography researchers, graduate scholars and practitioners.

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We state this in the next two theorems. Specifically, the first theorem states that the EtS method amplifies privacy and the second theorem states that the StE method amplifies authenticity. 3 If E is IND-CPA secure and S is sUF-CMA secure, then the signcryption scheme Π built using EtS is IND-CCA2 secure in the outsider security model. Proof Let A be the adversary breaking IND-CCA2 security of the Encrypt-thenSign signcryption scheme EtS in the outsider security model. Recall, A only knows sig (pk S , pkenc R ) and has access to the signcryption and the unsigncryption oracles Signcrypt and Unsigncrypt.

One of these will be signcrypted at random, the corresponding signcryption challenge C ∗ will be given to A and A has to guess which message was signcrypted. Here, A is forbidden to query the unsigncryption oracle on the challenge C ∗ . Formally, we consider a game played between a challenger and a PPT attacker A = (A1 , A2 ): R 1. The challenger generates common parameters param ← Setup(1k ), a sender R R key pair (sk S , pk S ) ← KeyGen S (param), and a receiver key pair (sk R , pk R ) ← KeyGen R (param).

Hence, we have an additional security notion in the 2 Security for Signcryption: The Two-User Model 25 public-key setting and we call it insider security. As opposed to the insider security, we call the security against an outsider outsider security, which is the security that is also considered in the symmetric setting. Outsider Security We define security against the strongest security notions of authenticity (the analogs of UF-CMA or sUF-CMA for digital signature schemes) and privacy (the analog of IND-CCA2 for public-key encryption schemes).

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Practical Signcryption by Yuliang Zheng (auth.), Alexander W. Dent, Yuliang Zheng (eds.)


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