IEICE Transactions on Information and Systems
Online ISSN : 1745-1361
Print ISSN : 0916-8532
Regular Section
Security of Cloud-Based Revocable Identity-Based Proxy Re-Encryption Scheme
Seunghwan PARKDong Hoon LEE
Author information

2016 Volume E99.D Issue 7 Pages 1933-1936


Designing secure revocable storage systems for a large number of users in a cloud-based environment is important. Cloud storage systems should allow its users to dynamically join and leave the storage service. Further, the rights of the users to access the data should be changed accordingly. Recently, Liang et al. proposed a cloud-based revocable identity-based proxy re-encryption (CR-IB-PRE) scheme that supports user revocation and delegation of decryption rights. Moreover, to reduce the size of the key update token, they employed a public key broadcast encryption system as a building block. In this paper, we show that the CR-IB-PRE scheme with the reduced key update token size is not secure against collusion attacks.

Content from these authors
© 2016 The Institute of Electronics, Information and Communication Engineers
Previous article Next article