Abstract
The use of rank instead of Hamming metric has been proposed to address the main drawback of code-based cryptography: large key sizes. There exist several Key Encapsulation Mechanisms (KEM) and Public Key Encryption (PKE) schemes using rank metric including some submissions to the NIST call for standardization of Post-Quantum Cryptography. In this work, we present an PKE scheme based on the McEliece adaptation to rank metric proposed by Loidreau at PQC 2017. This PKE scheme based on rank metric does not use a hybrid construction KEM + symmetric encryption. Instead, we take advantage of the bigger message space obtained by the different parameters chosen in rank metric, being able to exchange multiple keys in one ciphertext. Our proposal is designed considering some specific properties of the random error generated during the encryption. We prove our proposal -secure in the QROM by using a security notion called disjoint simulatability introduced by Saito et al. in Eurocrypt 2018. Moreover, we provide security bounds by using the semi-oracles introduced by Ambainis et al.
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Notes
- 1.
The idea is that , once given the public key, is responsible to generate a test instance composed by two messages of its choice, while receives a challenge ciphertext generated as a probabilistic function of the test instance, and must output a guess of which of the two messages has been encrypted.
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Shehhi, H.A., Bellini, E., Borba, F., Caullery, F., Manzano, M., Mateu, V. (2019). An IND-CCA-Secure Code-Based Encryption Scheme Using Rank Metric. In: Buchmann, J., Nitaj, A., Rachidi, T. (eds) Progress in Cryptology – AFRICACRYPT 2019. AFRICACRYPT 2019. Lecture Notes in Computer Science(), vol 11627. Springer, Cham. https://doi.org/10.1007/978-3-030-23696-0_5
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