@misc{cryptoeprint:2013:415,
    author = {Ciaran Mullan and Boaz Tsaban},
    title = {SL2  homomorphic hash functions: Worst case to average case reduction and  short collision search},
    howpublished = {Cryptology ePrint Archive, Report 2013/415},
    year = {2013},
    url = {https://eprint.iacr.org/2013/415},
}