Welcome to the resource topic for 2025/544
Title:
Security Analysis of Covercrypt: A Quantum-Safe Hybrid Key Encapsulation Mechanism for Hidden Access Policies
Authors: Théophile Brézot, Chloé Hébant, Paola de Perthuis, David Pointcheval
Abstract:The ETSI Technical Specification 104 015 proposes a framework to build Key Encapsulation Mechanisms (KEMs) with access policies and attributes, in the Ciphertext-Policy Attribute-Based Encryption (CP-ABE) vein. Several security guarantees and functionalities are claimed, such as pre-quantum and post-quantum hybridization to achieve security against Chosen-Ciphertext Attacks (CCA), anonymity, and traceability.
In this paper, we present a formal security analysis of a more generic construction, with application to the specific Covercrypt scheme, based on the pre-quantum ECDH and the post-quantum ML-KEM KEMs. We additionally provide an open-source library that implements the ETSI standard, in Rust, with high effiency.
ePrint: https://eprint.iacr.org/2025/544
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