Abstract
Hierarchical secret sharing schemes are known for how they share a secret among a group of participants partitioned into levels. In this study, we consider using a systematic information dispersal algorithm (IDA). We then apply the general concept of hierarchy to the generator matrix used in a systematic IDA and propose an ideal hierarchical secret sharing scheme applicable at any level. For perfect privacy, secret sharing schemes depend on the fact that an adversary can only pool at most \(k-1\) shares. However, in our hierarchical scheme, we need to consider an adversary can also pool k or more shares of lower-level participants. Moreover, considering practical use, we present our evaluation of our software implementation.
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Acknowledgments
The authors thank the anonymous reviewers for their helpful comments. This work was supported by JSPS KAKENHI Grant Number JP18K11306.
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Shima, K., Doi, H. (2019). A Hierarchical Secret Sharing Scheme Based on Information Dispersal Techniques. In: Lee, K. (eds) Information Security and Cryptology – ICISC 2018. ICISC 2018. Lecture Notes in Computer Science(), vol 11396. Springer, Cham. https://doi.org/10.1007/978-3-030-12146-4_14
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