Journal of Broadcast Engineering (방송공학회논문지)

The Korean Institute of Broadcast and Media Engineers (한국방송∙미디어공학회)
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An Efficient Broadcast Encryption System with Delegation of Decryption

복호화 위임을 제공하는 효율적인 브로드캐스트 암호시스템

  • Han, Su Min (Graduate School of Information Security, Korea University) ;
  • Park, Seung Hwan (Graduate School of Information Security, Korea University) ;
  • Park, Jong Hwan (Division of Computer Science. College of Computer Software and Media Technology. Sangmyung University) ;
  • Lee, Dong Hoon (Graduate School of Information Security, Korea University)
  • 한수민 (고려대학교 정보보호대학원) ;
  • 박승환 (고려대학교 정보보호대학원) ;
  • 박종환 (상명대학교 소프트웨어대학 컴퓨터과학과) ;
  • 이동훈 (고려대학교 정보보호대학원)
  • Received : 2013.08.08
  • Accepted : 2013.09.25
  • Published : 2013.09.30
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Abstract

In a Broadcast Encryption System, a sender sends an encrypted message to a large set of receivers at once over an insecure channel and it enables only users in a target set to decrypt the message with their private keys. In 2005, Boneh et al. proposed a fully collusion-resistant public key broadcast encryption in which the ciphertext and the privatekey sizes are constant. In general, pairing-based broadcast encryption system is efficient in bandwidth and storing aspects than non-pairing based broadcast encryption system, however, it requires many computational costs that resource-constrained devices is not suit to be applied. In this paper, we propose a Broadcast Encryption scheme(called BEWD) that user can decrypt a ciphertext more efficiently. The scheme is based on Boneh et al.scheme. More precisely, it reduces receiver's computational costs by delegating pairing computation to a proxy server which computation is required to receiver in Boneh et al.scheme. Furthermore, the scheme enables a user to check if the proxy server compute correctly. We show that our scheme is secure against selective IND-RCCA adversaries under l-BDHE assumption.

브로드캐스트 암호시스템은 송신자가 수신자 집합을 지정하여 생성한 암호문을 공개된 채널을 통해 전송하면, 수신자 집합에 속하는 정당한 사용자만이 메시지를 복호화 할 수 있는 암호 기법이다. 2005년도에는 공모공격에 안전하며 상수크기의 암호문과 비밀키를 가지는 페어링 기반의 기법이 Boneh 등에 의해 제안되었다. 일반적으로 페어링 기반의 기법은 사용자로부터 많은 연산량을 요구하기 때문에 리소스에 제한이 있는 기기에 적용하기에는 어려움이 있었다. 본 논문에서는 Boneh 등의 기법을 기반으로 브로드캐스트 암호시스템에서 암호문을 효율적으로 복호화 하는 기법(BEWD)을 제안한다. 제안하는 기법에서는 복호화 시에 요구되는 페어링연산과 다른 사용자들의 공개키가 쓰이는 연산을 제 3자인 프록시 서버에 위임함으로써 사용자에게 요구되는 연산량을 줄인다. 또한 사용자는 서버의 올바른 계산을 확인을 할 수 있다. 제안하는 기법은 n-BDHE가정 하에 선택적인 IND-RCCA에 안전한 기법이다.

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