An Improvement of Novel Cryptographic Key Assignment Scheme for Dynamic Access Control in a Hierarchy
Min‐Shiang Hwang, Nonmember · IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences · 1999
held by users in SCj, but the users in SCj cannot access the information held by the users in SCi. There are two algorithms in the Shen-Chen-Lai Scheme for access control in a hierarchy: the key generation algorithm and the key derivation algorithm. The key generation algorithm is based on the Chinese remainder theorem; and the key derivation algorithm is based on Rabin’s public key system. The key generation algorithm is completed by central authority (CA), whose main role is to generate public and secret information to each security class. After the key generation algorithm, CA assigns five parameters to each security class SCi, denoted as Hi,bi,ni,Ci, and IDi. Here, Hi is secret information owned by