A Constructive Perspective on Signcryption Security

Badertscher, Christian; Banfi, Fabio; Maurer, Ueli

doi:10.1007/978-3-319-98113-0_6

Cited by 10 publications

(1 citation statement)

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“…A natural use of a signcryption scheme is to build an asynchronous secure channel i. e. a confidential and authenticated asynchronous channel. Given the similar uses of signcryption and (one pass) Key Exchange Protocols (KEP), to build confidential and authenticated channels, it appears, from a real world perspective, that the right security definition for signcryption schemes is insider security [3]. Informally, insider security ensures (i) confidentiality even if the sender's static private key is revealed to the attacker, and (ii) unforgeability even if the receiver's static private key is disclosed.…”

Section: Introductionmentioning

confidence: 99%

A Computational Diffie–Hellman-Based Insider Secure Signcryption with Non-interactive Non-repudiation

Sarr

Togde

2022

Springer Proceedings in Mathematics &Amp; Statistics

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An important advantage of signcryption schemes compared to one pass key exchange protocols is non-interactive non-repudiation (NINR). This attribute offers to the receiver of a signcrypted ciphertext the ability to generate a non-repudiation evidence, that can be verified by a third party without executing a costly multi-round protocol. We propose a computational Diffie-Hellman based insider secure signcryption scheme with non-interactive non-repudiation. Namely, we show that under the computational Diffie-Hellman assumption and the random oracle model, our scheme is tightly insider secure, provided the underlying encryption scheme is semantically secure. Compared to a large majority of the previously proposed signcryption schemes with NINR, our construction is more efficient and it does not use any specificity of the underlying group, such as pairings. The communication overhead of our construction, compared to Chevallier Mâmes' signature scheme is one group element.

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Section: Introductionmentioning

confidence: 99%