Distributed computing


Some Performance Issues (from Radu Sion)



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distcomp

Some Performance Issues (from Radu Sion)

  • Pentium 4, 3.6 ghz, 1 gigabyte of RAM
  • RSA sign: 261/sec; RSA verify: 5324/sec
  • Private key (3DES): 26 MB/sec
  • Collision free hashing: 200 MB/sec

Secure File System Protocol (David Mazieres)

  • Basically, the downloader uses an SSL interaction with the server that downloader trusts.
  • That is, downloader encrypts a session private key using that server’s public key.
  • So, nobody else can know what downloader requested.
  • Not yet solved: how does downloader know this server is validated by author?

Secure File System Protocol key insight

  • Each file name is of the form: /sfs/nyu/cs5349874628/dennis/foobar
  • The funny number is the SHA-1 hash of the public key of the proper server.
  • So, this is the proper server for the file iff the public key of the server Pk when hashed gives cs5349874628.
  • Downloader checks this before sending the SSL message which will use Pk.

Secure File System Protocol questions

  • What if you lie about your public key?
  • How do I discover these strange names?

Secure File System Protocol answers

  • What if you lie about your public key?
    • You can but then you won’t have the associated private key so won’t be able to respond properly to my SSL request.
  • How do I discover these strange names?
    • There does have to be one site you trust which has names you believe.

Secure File System Protocol summary

  • Downloader goes to trusted name server site.
  • Gets name (including funny encrypted part) and maybe other information, e.g. hash of the contents.
  • Goes to a server that allegedly holds that file. If server’s public key when hashed equals the funny part of the name, then that server is legitimate.
  • So, downloader engages that server in SSL and downloads the file confidentially.

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