@inproceedings{GJM:2002,
    author = "P.~Golle and S.~Jarecki and I.~Mironov",
    title = "Cryptographic Primitives Enforcing Communication and 
Storage Complexity",
    booktitle = "Proc. of Financial Crypto 2002",
    year = 2002,
    series =      "Lecture Notes in Computer Science"
}