International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: Privacy Preserving Keyword Searches on Remote Encrypted Data

Yan-Cheng Chang
Michael Mitzenmacher
Search ePrint
Search Google
Abstract: We consider the following problem: a user \U\ wants to store his files in an encrypted form on a remote file server \FS. Later the user \U\ wants to efficiently retrieve some of the encrypted files containing (or indexed by) specific keywords, keeping the keywords themselves secret and not jeopardizing the security of the remotely stored files. For example, a user may want to store old e-mail messages encrypted on a server managed by Yahoo or another large vendor, and later retrieve certain messages while traveling with a mobile device. In this paper, we offer solutions for this problem under well-defined security requirements. Our schemes are efficient in the sense that no public-key cryptosystem is involved. Indeed, our approach is independent of the encryption method chosen for the remote files. They are also incremental, in that \U\ can submit new files which are totally secure against previous queries but still searchable against future queries.
  title={Privacy Preserving Keyword Searches on Remote Encrypted Data},
  booktitle={IACR Eprint archive},
  keywords={cryptographic protocols /},
  note={ 12480 received 21 Feb 2004, last revised 3 Mar 2004},
  author={Yan-Cheng Chang and Michael Mitzenmacher},