Journal of the Institute of Electronics and Information Engineers (전자공학회논문지)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Method of Changing Password for Secure Cloud Storage based on Proxy Re-encryption Scheme

프록시 재암호화 기반의 보안 클라우드 저장장치를 위한 분실된 비밀번호 변경 기법

  • Received : 2015.11.23
  • Accepted : 2016.03.08
  • Published : 2016.03.25
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Abstract

In cloud storages, as security of stored files and privacy of users become regarded as important concerns, secure cloud storages have been proposed, where stored files are encrypted with file owner's password and even the cloud service provider can not open the file contents. However, if the file owner forgets one's password, one can no longer access the file. To solve this problem, we propose a scheme for changing password for the secure cloud based on proxy re-encryption, which make the file owner enable to change password even when one forgets it. With the proposed scheme, only the file owner can change the password and re-encrypt the files securely because other user and even the service provider can not see the file contents.

클라우드에서 저장된 데이터의 보안 및 사용자의 프라이버시가 중요해짐에 따라 암호화하여 파일을 저장하되 사용자만 복호화할 수 있고, 클라우드 서비스 제공업체 조차도 암호화된 파일을 열어볼 수 없는 보안 클라우드가 개발되었다. 하지만, 이러한 제약 때문에 사용자가 비밀번호를 분실하면 저장된 데이터를 아무도 열어보지 못 하는 부작용이 발생하게 된다. 본 논문에서는 상기 문제점을 해결하기 위하여 프록시 재암호화 기법을 이용하여 보안 클라우드에서 사용자가 비밀번호를 분실하더라도 비밀번호를 갱신할 수 있는 기법을 제안하고자 한다. 본 기술을 사용하면 제 3자 및 클라우드 서비스 제공업체 조차도 파일 내용을 볼 수 없기 때문에 오로지 파일 소유자만이 안전하게 비밀번호를 업데이트 하고 암호화된 파일을 재암호화 할 수 있다.

Keywords

References

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