@misc{cryptoeprint:2017:713,
    author = {Paul Rösler and Christian Mainka and Jörg Schwenk},
    title = {More is Less: How Group Chats Weaken the Security of Instant Messengers Signal, WhatsApp, and Threema},
    howpublished = {Cryptology ePrint Archive, Report 2017/713},
    year = {2017},
    url = {https://eprint.iacr.org/2017/713},
}