Cryptology ePrint Archive: BibTeX Citation of Report 2006/219

@misc{cryptoeprint:2006:219,
    author = {Michael Backes and Iliano Cervesato and Aaron D. Jaggard and Andre Scedrov and Joe-Kai Tsay},
    title = {Cryptographically Sound Security Proofs for Basic and Public-Key Kerberos},
    howpublished = {Cryptology ePrint Archive, Report 2006/219},
    year = {2006},
    note = {\url{http://eprint.iacr.org/}},
}

You will need the url.sty package (comes with most LaTeX installations) for the last line. Otherwise, remove the \url command.