@misc{cryptoeprint:2000:011,
author = {Gideon Samid},
title = {Tailored Key Encryption (TaKE) Tailoring a key for a given pair of plaintext/ciphertext},
howpublished = {Cryptology ePrint Archive, Report 2000/011},
year = {2000},
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.