Cryptanalysis of A Hierarchical Data Access and Key Management in Cloud Computing
Cheng‐Ying Yang, Cheng‐Chi Lee, Tsuei-Hung Sun, Min‐Shiang Hwang · IOP Conference Series Materials Science and Engineering · 2018
One of major applications in cloud computing is cloud storage service. It's an important research issue to protect the stored data from illegal access by the system manager in the Cloud. To encrypt entire file by using data owner's secret keys is the simple solution. However it will raise a key management problem. To solve this problem, Hwang and Sun proposed a hierarchical key management scheme. In their scheme, the data owner could change the encryption key more easily, and not to affect other users in Cloud Storage Service system. However, we find that some weaknesses of their scheme. In this article, we will show some weaknesses of their scheme.