@InProceedings {dfjps-vldb2007,
    author = {S. {De Capitani di Vimercati} and S. Foresti and S. Jajodia and S. Paraboschi and P. Samarati},
    booktitle = {Proc. of the 33rd International Conference on Very Large Data Bases (VLDB 2007)},
    title = {Over-encryption: Management of Access Control Evolution on Outsourced Data},
    address = {Vienna, Austria},
    month = {September},
    day = {23-28},
    year = {2007}
}