@misc{cryptoeprint:2013:683,
    author = {Venkata Koppula and Kim Ramchen and Brent Waters},
    title = {Separations in Circular Security for Arbitrary Length Key Cycles},
    howpublished = {Cryptology ePrint Archive, Report 2013/683},
    year = {2013},
    url = {https://eprint.iacr.org/2013/683},
}