LS26 introduces a symmetric CP-ABE framework in which both encryptor and decryptor must hold attributes satisfying the ciphertext policy, and gives a concrete construction from collision-resistant hash functions, a PRF, and an IND-CCA2 authenticated encryption scheme, with no bilinear map or lattice hardness assumption.

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@misc{LS26,
  author       = {Riccardo Longo and Enrico Sorbera},
  title        = {Symmetric Attribute-Based Encryption from Minimal Hardness Assumptions},
  howpublished = {Cryptology ePrint Archive, Paper 2026/1018},
  year         = {2026},
  url          = {https://eprint.iacr.org/2026/1018}
}