Abstract
Deniable authenticated encryption (DAE) is a cryptographic primitive that supports data confidentiality with deniable authentication in an efficient manner. The DAE plays a significant role in location-based service systems for privacy protection. In this paper, we construct a certificateless DAE (CLDAE) scheme. The CLDAE is based on certificateless cryptosystems (CLCs), which avoids the need to manage public key certificates in public key infrastructure (PKI)-based cryptosystems and key escrow problems in identity-based cryptosystems (IBCs). Our design utilizes hybrid methods: tag-key encapsulation mechanism (TKEM) and data encapsulation mechanism (DEM). This technique is more suitable for location-based applications. We show how to construct a CLDAE scheme utilizing a certificateless deniable authenticated tag-KEM (CLDATK) and a DEM. We also design a CLDATK scheme and provide formal security proof using the random oracle model (ROM). We conduct a comprehensive performance analysis, which shows that CLDAE is highly efficient in terms of communication overhead. We also provide an application of the CLDAE for a location-based service (LBS) system.
Highlights
With the rapid expansion in mobile social networks, smart devices, and localization techniques, location-based service (LBS) have become an indispensable part of daily life duo to the fact that they provide users with various types of services related to location [1]–[3].To use an location-based services (LBSs), users submit their location-based requirements (a nearest point of interest (POI), such as the nearest hospital, gas station or movie theatre) to a location-based service provider (LBSP); the LBSP returns the location response to the users
On the basis of this, the LBSP can deduce from private information about the user, such as commute routes, daily activity trajectories, and social connections
When a user requests an LBS for hospital, the LBSP could predict that the user may have a health problem
Summary
With the rapid expansion in mobile social networks, smart devices, and localization techniques, location-based service (LBS) have become an indispensable part of daily life duo to the fact that they provide users with various types of services related to location [1]–[3]. Li et al [33] presented a DAE scheme that simultaneously achieves confidentiality, integrity and deniable authentication Their scheme works in a PKI environment; it has the public key management problem. To solve this problem, Li et al [34] constructed a tag/KEM-DEM hybrid DAE scheme and showed it to be VOLUME 7, 2019 highly efficient through a comprehensive analysis. Li et al [34] constructed a tag/KEM-DEM hybrid DAE scheme and showed it to be VOLUME 7, 2019 highly efficient through a comprehensive analysis Their scheme has the key escrow problem, which means that the PKG is capable of knowing all the entities’ private keys.
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