## Abstract

We prove that for every n and 1 < t < n any t-out-of-n threshold secret sharing scheme for one-bit secrets requires share size log(t + 1). Our bound is tight when t = n − 1 and n is a prime power. In 1990 Kilian and Nisan proved the incomparable bound log(n −t + 2). Taken together, the two bounds imply that the share size of Shamir’s secret sharing scheme (Comm. ACM 1979) is optimal up to an additive constant even for one-bit secrets for the whole range of parameters 1 < t < n. More generally, we show that for all 1 < s < r < n, any ramp secret sharing scheme with secrecy threshold s and reconstruction threshold r requires share size log((r + 1)/(r − s)). As part of our analysis we formulate a simple game-theoretic relaxation of secret sharing for arbitrary access structures. We prove the optimality of our analysis for threshold secret sharing with respect to this method and point out a general limitation.

Original language | American English |
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Pages (from-to) | 1-18 |

Number of pages | 18 |

Journal | Theory of Computing |

Volume | 16 |

Issue number | 1 |

DOIs | |

State | Published - 2020 |

### Bibliographical note

Publisher Copyright:© 2020 Andrej Bogdanov, Siyao Guo, and Ilan Komargodski.

## Keywords

- Lower bound
- Threshold
- secret sharing