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Cryptanalysis and Repair of "Decentralized Multi-authority ABE for NC$^1$ from BDH"

Xingwang Wang · 2026 · arXiv

DOI: 10.48550/arXiv.2610.29224 · open-access PDF

Indonesian

Kami menyajikan serangan pemulihan teks sederhana terhadap konstruksi enkripsi berbasis atribut multi-authority yang terdesentralisasi dari Datta, Komargodski, dan Waters (Journal of Cryptology, 2023). Serangan ini berhasil dalam model statis yang dinyatakan dengan satu otoritas korup dan dua pengguna yang set atribut individualnya tetap tidak diizinkan bahkan ketika dikombinasikan dengan atribut otoritas korup. Kelemahan adalah ekstensi yang tidak benar dari invariance matriks-normalisasi LSSS dari saham rahasia lengkap ke masker teks enkripsi yang berkoordinasi. Sebuah otoritas korup dapat mengekspos masker ini dan menghapus ikatan identitas dari orang lain.

Machine translation (Meta M2M100); the English original follows.

Abstract

We present a plaintext-recovery attack on the decentralized multi-authority attribute-based encryption construction of Datta, Komargodski, and Waters (Journal of Cryptology, 2023). The attack succeeds in the claimed static model with one corrupt authority and two users whose individual attribute sets remain unauthorized even when combined with the corrupt authority's attribute. The flaw is an incorrect extension of LSSS matrix-normalization invariance from complete secret shares to coordinate-wise ciphertext masks. A corrupt authority can expose these masks and remove identity binding from oth

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