@misc{cryptoeprint:2015:1216,
    author = {Hui Guo and Zhenfeng Zhang and Jing Xu},
    title = {Non-Transferable Proxy Re-Encryption},
    howpublished = {Cryptology ePrint Archive, Report 2015/1216},
    year = {2015},
    url = {https://eprint.iacr.org/2015/1216},
}