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LPABE: Lattice-Based Puncturable Attribute-Based Encryption for Secure Cloud Storage Services
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DOI：10.1109/tcc.2026.3716629.png)
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Abstract
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Cloud storage requires fine-grained access control (FGAC), efficient permission revocation, and security against quantum attacks. Existing puncturable attribute-based encryption (PABE) schemes either rely on pairing-based assumptions or suffer from key expansion, ciphertext expansion, or owner-coupled key management when deployed in multi-tenant cloud environments. This paper presents LPABE, a lattice-based PABE scheme that combines policy-level attribute authorization with tag-level user-autonomous puncturing. The proposed scheme introduces a noise-controlled decryption structure based on disjunctive normal form (DNF) policy transformation and symmetric Lagrange coefficient allocation, reducing reconstruction-induced noise growth under the considered policy class. It supports puncture-history-independent local puncturing, while user keys and ciphertexts remain independent of puncture history and revocation-list size. A decoupled credential design further enables a single user key to be used across authorized data sources without data-owner-specific rebinding. Compared with representative lattice-based PABE schemes, the construction avoids puncture-count-dependent quadratic key growth, revocation-list-dependent ciphertext expansion, and data-owner-dependent key-management growth. We prove indistinguishability under chosen-plaintext attacks (IND-CPA) in the selective access-policy and selective tag setting under the Learning With Errors (LWE) assumption, and analyze resistance to collusion attacks. Experimental results demonstrate that LPABE provides practical online performance, with decryption remaining below 45 ms for 50 satisfied attribute leaves and below 11 ms for 50 ciphertext tags, while local puncturing stays nearly constant at about 13.6 ms across repeated punctures.
Keywords:
Attribute-based encryption
puncturable encryption
lattice-based cryptography
access control
cloud security
post-quantum cryptography
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