@misc{cryptoeprint:2017:695,
    author = {Christian Cachin and Jan Camenisch and Eduarda Freire-Stoegbuchner and Anja Lehmann},
    title = {Updatable Tokenization: Formal Definitions and Provably Secure Constructions},
    howpublished = {Cryptology ePrint Archive, Report 2017/695},
    year = {2017},
    url = {https://eprint.iacr.org/2017/695},
}