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Certificateless Public Key Encryption Revisited: Security Model and Construction

무인증서 공개키 암호 기법의 재고: 안전성 모델 및 설계

Kim, Songyi;Park, Seunghwan;Lee, Kwangsu
김송이;박승환;이광수

  • Received : 2016.04.27
  • Accepted : 2016.05.09
  • Published : 2016.06.30

Abstract

Certificateless public key cryptography is a technique that can solve the certificate management problem of a public key cryptosystem and clear the key escrow issue of ID-based cryptography using the public key in user ID. Although the studies were actively in progress, many existing schemes have been designed without taking into account the safety of the secret value with the decryption key exposure attacks. If previous secret values and decryption keys are exposed after replacing public key, a valid private key can be calculated by obtaining the partial private key corresponding to user's ID. In this paper, we propose a new security model which ensures the security against the key exposure attacks and show that several certificateless public key encryption schemes are insecure in the proposed security model. In addition, we design a certificateless public key encryption scheme to be secure in the proposed security model and prove it based on the DBDH(Decisional Bilinear Diffie-Hellman) assumption.

Keywords

Certificateless;Cryptography;Key Exposure Attack;Decision Bilinear Diffie-Hellman assumption;etc

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Acknowledgement

Grant : The Types of employment contract to support master's degree in Information Security, A study of a public-key authentication framework for internet entities with hierarchical identities

Supported by : KISA(Korea Internet Security Agency), Institute for Information & communications Technology Promotion(IITP)