Plutus: Scalable secure file sharing on untrusted storage

Mahesh Kallahalla, Erik Riedel, Ram Swaminathan, Qian Wang, Kevin Fu

Research output: Contribution to conferencePaperpeer-review

444 Scopus citations


Plutus is a cryptographic storage system that enables secure file sharing without placing much trust on the file servers. In particular, it makes novel use of cryptographic primitives to protect and share files. Plutus features highly scalable key management while allowing individual users to retain direct control over who gets access to their files. We explain the mechanisms in Plutus to reduce the number of cryptographic keys exchanged between users by using filegroups, distinguish file read and write access, handle user revocation efficiently, and allow an untrusted server to authorize file writes. We have built a prototype of Plutus on OpenAFS. Measurements of this prototype show that Plutus achieves strong security with overhead comparable to systems that encrypt all network traffic.

Original languageEnglish (US)
Number of pages14
StatePublished - 2003
Event2nd USENIX Conference on File and Storage Technologies, FAST 2003 - San Francisco, United States
Duration: Mar 31 2003Apr 2 2003


Conference2nd USENIX Conference on File and Storage Technologies, FAST 2003
Country/TerritoryUnited States
CitySan Francisco

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Hardware and Architecture
  • Software


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