CAKE: Code-based Algorithm for Key Encapsulation

Abstract : Current widely-used key exchange (KE) mechanisms will be vulnerable to quantum attacks when sufficiently strong quantum computers become available. Therefore, devising quantum-resistant replacements that combine efficiency with solid security guarantees is an important and challenging task. This paper proposes several contributions towards this goal. First, we introduce " CAKE " , a key encapsulation algorithm based on the QC-MDPC McEliece encryption scheme, with two major improvements: a) the use of ephemeral keys that defeats a recent reaction attack against MDPC decoding of the corresponding encryption scheme and b) a highly efficient key generation procedure for QC-MDPC-based cryptosystems. Then, we present an authenticated key exchange protocol based on CAKE, which is suitable for the Internet Key Exchange (IKE) standard. We prove that CAKE is IND-CPA secure, that the protocol is SK-Secure, and suggest practical parameters. Compared to other post-quantum schemes, we believe that CAKE is a promising candidate for post-quantum key exchange standardization.
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Submitted on : Tuesday, December 12, 2017 - 2:45:22 PM
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Paulo S. L. M. Barreto, Shay Gueron, Tim Guneysu, Rafael Misoczki, Edoardo Persichetti, et al.. CAKE: Code-based Algorithm for Key Encapsulation. Máire O'Neill. IMACC 2017 - 16th IMA International Conference on Cryptography and Coding, Dec 2017, Oxford, United Kingdom. Springer, 10655, pp.207--226, 2017, LNCS - Lecture Notes in Computer Science. 〈10.1007/978-3-319-71045-7_11〉. 〈hal-01661949〉



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