Earticle

초록

영어

As Hierarchical Identity Based Encryption (HIBE) system usually maps the true institutional structure of an organization or entity relationship between objects in real world, It is important that computation & communication complexity of private key, ciphertext, cryptographic computations and so on related to an entity in the hierarchy is independent to the hierarchy depth of the entity. Moreover, key escrow problem that any non-leaf entity in a hierarchical identity based cryptosystem can derive private keys for its descendants with use of its private key should be resolved, in order to prevent any entity from behaving on behalf of its descendants. In this paper, a new technique is introduced for composing a private key for each individual entity in HIBE system by differentiating between non-local identifiers and local identifiers of the identity of the entity. That we call Identifier Discrimination. With the technique, A selective identity secure HIBE system is constructed under Decisional Bilinear Diffie-Hellman (DBDH) assumption without using random oracles, where the private key and the ciphertext consist of constant number of group elements, and decryption requires only three bilinear map computations, regardless of the identity hierarchy depth. Moreover, in contrast to previous HIBE constructions, where private key for an entity can be derived by its ancestors with direct use of their private keys, key escrow problem inherent in identity based cryptosystems is resolved in our HIBE construction. Privilege of deriving private keys for an entity can be delegated to any of its ancestors through authorization by distributing specifically crafted values to the ancestor in our HIBE system, that we call Authorized Delegation.

목차

Abstract
 1. Introduction
  1.1. Problem Formulation
  1.2. Related Work
  1.3. Our Approach
 2. Preliminaries
  2.1. Bilinear Pairings
  2.2. HIBE Systems
  2.3. Complexity Assumptions
 3. Our HIBE Construction with Constant Size Private Key and Constant Size Ciphertext
  3.1. Construction
  3.2. Correctness and Dedicated Encryption Privacy
 4. Authorized Delegation: Private Key Derivation with Authorized Secret
  4.1. Private Key – Ineligible Secret for Derivation
  4.2. Authorized Secret for Derivation
 5. Conclusion
 References

키워드

저자

• Jian-Wu Zheng [ Institute of Electrical Engineering, Yanshan University, 066004, China, School of Transportation, Shijiazhuang Tiedao University, 050043, China ]
• Jing Zhao [ School of Civil Engineering, Shijiazhuang Tiedao University, 050043, China ]
• Xin-Ping Guan [ Institute of Electrical Engineering, Yanshan University, 066004, China, Department of Automation, Shanghai Jiao Tong University, 200240, China ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  International Journal of Security and Its Applications

• 간기

  격월간

• pISSN

  1738-9976

• 수록기간

  2008~2016

• 등재여부

  SCOPUS

• 십진분류

  KDC 505 DDC 605