Cryptanalysis of GGH15 Multilinear Maps
- Cite this paper as:
- Coron JS., Lee M.S., Lepoint T., Tibouchi M. (2016) Cryptanalysis of GGH15 Multilinear Maps. In: Robshaw M., Katz J. (eds) Advances in Cryptology – CRYPTO 2016. CRYPTO 2016. Lecture Notes in Computer Science, vol 9815. Springer, Berlin, Heidelberg
We describe a cryptanalysis of the GGH15 multilinear maps. Our attack breaks the multipartite key-agreement protocol in polynomial time by generating an equivalent user private key; it also applies to GGH15 with safeguards. We also describe attacks against variants of the GGH13 multilinear maps proposed by Halevi (ePrint 2015/866) aiming at supporting graph-induced constraints, as in GGH15.