Reference : On the Joint Security of Signature and Encryption Schemes under Randomness Reuse: Eff...
Scientific congresses, symposiums and conference proceedings : Paper published in a book
Engineering, computing & technology : Computer science
On the Joint Security of Signature and Encryption Schemes under Randomness Reuse: Efficiency and Security Amplification
Delerue Arriaga, Afonso mailto [University of Minho > HASLab/INESC TEC]
Barbosa, Manuel mailto [University of Minho > HASLab/INESC TEC]
Farshim, Pooya mailto [Darmstadt University of Technology > Department of Computer Science]
Applied Cryptography and Network Security, Singapore 26-29 June, 2012
10th International Conference on Applied Cryptography and Network Security (ACNS '12)
from 26-06-2012 to 29-06-2012
[en] Signcryption ; Insider Security ; Randomness Reuse
[en] WeextendtheworkofBellare,BoldyrevaandStaddononthesystematicanalysisofrandomness reuse to construct multi-recipient encryption schemes to the case where randomness is reused across different cryptographic primitives. We find that through the additional binding introduced through randomness reuse, one can actually obtain a security amplification with respect to the standard black-box compositions, and achieve a stronger level of security. We introduce stronger notions of security for encryption and signatures, where challenge messages can depend in a restricted way on the random coins used in encryption, and show that two variants of the KEM/DEM paradigm give rise to encryption schemes that meet this enhanced notion of security. We obtain a very efficient signcryption scheme that is secure against insider attackers without random oracles.

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