@misc{cryptoeprint:2010:376,
author = {S. Sharmila Deva Selvi and S. Sree Vivek and C. Pandu Rangan},
title = {Identity Based Online/Offline Signcryption Scheme},
howpublished = {Cryptology ePrint Archive, Report 2010/376},
year = {2010},
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.