@misc{cryptoeprint:2014:849,
    author = {Ryotaro Hayashi and Tatsuyuki Matsushita},
    title = {A Proxy Re-Encryption Scheme with the Unforgeability of Re-Encryption Keys against Collusion Attacks},
    howpublished = {Cryptology ePrint Archive, Report 2014/849},
    year = {2014},
    url = {https://eprint.iacr.org/2014/849},
}