Security of cloud-based revocable identity-based proxy re-encryption scheme

Seunghwan Park, Dong Hoon Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


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.

Original languageEnglish
Pages (from-to)1933-1936
Number of pages4
JournalIEICE Transactions on Information and Systems
Issue number7
Publication statusPublished - 2016 Jul


  • Ciphertext update
  • Cloudbased identity-based proxy re-encryption
  • Key revocation
  • Revocable identity-based encryption

ASJC Scopus subject areas

  • Software
  • Hardware and Architecture
  • Computer Vision and Pattern Recognition
  • Electrical and Electronic Engineering
  • Artificial Intelligence


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