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Element-Level Access Control on Encrypted SQL Tables Using CP-ABE: Optimized on Reusable Sub-Policy
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Summary
Researchers propose EGuardSQL, an architecture that provides element-level access control over encrypted SQL tables using Ciphertext-Policy Attribute-Based Encryption (CP-ABE) with hybrid row-level and column-level policies. They add a reusable sub-policy mechanism to cut redundant cryptographic computation, and report significant gains in computational and communication efficiency over conventional CP-ABE approaches, with low storage overhead. The authors formally prove selective IND-CPA security under the decisional q-parallel BDHE assumption and claim resistance to collusion attacks.