@inproceedings{5cbb5bc5070b47e797ce0e31cfc60966,

title = "Multi-linear secret-sharing schemes",

abstract = "Multi-linear secret-sharing schemes are the most common secret-sharing schemes. In these schemes the secret is composed of some field elements and the sharing is done by applying some fixed linear mapping on the field elements of the secret and some randomly chosen field elements. If the secret contains one field element, then the scheme is called linear. The importance of multi-linear schemes is that they provide a simple non-interactive mechanism for computing shares of linear combinations of previously shared secrets. Thus, they can be easily used in cryptographic protocols. In this work we study the power of multi-linear secret-sharing schemes. On one hand, we prove that ideal multi-linear secret-sharing schemes in which the secret is composed of p field elements are more powerful than schemes in which the secret is composed of less than p field elements (for every prime p). On the other hand, we prove super-polynomial lower bounds on the share size in multi-linear secret-sharing schemes. Previously, such lower bounds were known only for linear schemes.",

keywords = "Dowling geometries, Ideal secret-sharing schemes, multi-linear matroids",

author = "Amos Beimel and Aner Ben-Efraim and Carles Padr{\'o} and Ilya Tyomkin",

year = "2014",

month = jan,

day = "1",

doi = "https://doi.org/10.1007/978-3-642-54242-8_17",

language = "American English",

isbn = "9783642542411",

series = "Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)",

publisher = "Springer Verlag",

pages = "394--418",

booktitle = "Theory of Cryptography - 11th Theory of Cryptography Conference, TCC 2014, Proceedings",

address = "Germany",

note = "11th Theory of Cryptography Conference on Theory of Cryptography, TCC 2014 ; Conference date: 24-02-2014 Through 26-02-2014",

}