RT Journal Article
T1 Combined schemes for signature and encryption: The public-key and the identity-based setting
A1 González Vasco, María Isabel
A1 Hess, Florian
A1 Steinwandt, Rainer
AB Consider a scenario in which parties use a public-key encryption scheme and a signature scheme with a single public key/private key pair-so the private key sk is used for both signing and decrypting. Such a simultaneous use of a key is in general considered poor cryptographic practice, but from an efficiency point of view looks attractive. We offer security notions to analyze such violations of key separation. For both the identity-and the non-identity-based setting, we show that-although being insecure in general-for schemes of interest the resulting combined scheme can offer strong security guarantees.
PB Elsevier
SN 0890-5401
YR 2016
FD 2016-04
LK https://hdl.handle.net/10016/37412
UL https://hdl.handle.net/10016/37412
LA eng
NO First and last author were supported by the Spanish Ministerio de Economía y Competitividad through the project grant MTM-2012-15167.
DS e-Archivo
RD 27 jul. 2024