Key-aggregate cryptosystems (KAC) have attracted significant attention from the research
community because of their elegance and efficiency in enforcing predefined access control …

Proxy Re-encryption (PRE) offers an efficient solution for enforcing access control on
outsourced data through delegation of decryption rights of a delegator to a delegatee …

The problem of multicast encryption has been a focus of attention in the Internet of Things
environment for the last decade, in which one central server generates and securely …

Several group key management schemes have focused either on meeting security goals or
efficiency. However, only a few works exist that address the issue of handling offline users …

A vast body of literature is filled with many key management schemes constructed using
different cryptographic primitives. They aim toward either security goals or improvement in …

Proxy re-encryption enables the conversion of ciphertext of a message encrypted with one
users public key into a ciphertext that could be decrypted by another users private key. Proxy …

Cryptographic hierarchical access control is widely employed in systems that manage data
or resources. To meet scalability and high availability requirements, it is desirable that an …

In the literature, secure group key management schemes have focused on either rekeying
cost or security requirements, ie, forward and backward secrecy. There is little or no work …

The existing group key management schemes have considered passive adversary model to
show that schemes satisfy forward and backward secrecy requirements. A more pragmatic …

The traditional key management schemes focus on single-group settings. The design
principles focus on reducing the rekeying, storage, and computation costs and satisfying …