Paper 2012/483 Original: eprint.iacr.org/2012/483 ↗
An Efficient Signcryption Scheme from q-Diffie-Hellman Problems
Abstract
Confidentiality and authenticity are two fundamental security requirement of Public key Cryptography. These are achieved by encryption scheme and digital signatures respectively. Here we present a provably secure signcryption scheme in random oracle model by modifying Libert et al's scheme [2]. Our scheme is more e±cient and secure than Libert et al's scheme. Tan [1] proved that this scheme is not secure against non-adaptive chosen cipher text attacks. It has been also proved that the semantically secure symmetric encryption scheme proposed in the Libert et al's scheme is not su±cient to guarantee to be secure against adaptive chosen ciphertext attacks. Here we proposed a modified version of Libert et al's scheme. The security of which is proven using two as- sumptions, namely the Strong Diffie-Hellman (SDH) and Diffie-Hellman Inversion (DHI) in the random oracle model.
Metadata
- Available format(s)
PDF- Category
- Cryptographic protocols
- Publication info
- Preprint.
- History
- 2012-08-21: last updated
- 2012-08-21: published
- Short URL
- https://ia.cr/2012/483
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2012/483,
author = {Jayaprakash Kar},
title = {An Efficient Signcryption Scheme from q-Diffie-Hellman Problems},
howpublished = {Cryptology {ePrint} Archive, Paper 2012/483},
year = {2012},
url = {https://eprint.iacr.org/2012/483}
}