Paper 2026/2148 Original: eprint.iacr.org/2026/2148 ↗
Weighted Threshold Encryption with Silent Setup
Abstract
We construct the first non-trivial weighted threshold encryption scheme with silent setup. The CRS and each public key consists of O(W) group elements, where W is the maximum committee weight. Both the weight assignments and the threshold for decryption can be dynamically chosen at encryption time. Each partial decryption is a single G1 element computed non-interactively with one scalar multiplication, independent of the party's weight. The CPA ciphertext is two G_1 elements, improving upon the shortest known unweighted scheme, and CCA security costs two additional field elements. We prove security in the generic bilinear group model.
Metadata
- Available format(s)
PDF- Category
- Cryptographic protocols
- Publication info
- Preprint.
- History
- 2026-09-22: last updated
- 2026-09-22: published
- Short URL
- https://ia.cr/2026/2148
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2026/2148,
author = {Guru-Vamsi Policharla},
title = {Weighted Threshold Encryption with Silent Setup},
howpublished = {Cryptology {ePrint} Archive, Paper 2026/2148},
year = {2026},
url = {https://eprint.iacr.org/2026/2148}
}