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Title:
HILA5 Pindakaas: On the CCA security of lattice-based encryption with error correction
Authors: Daniel J. Bernstein, Leon Groot Bruinderink, Tanja Lange, Lorenz Panny
Abstract:We show that the NISTPQC submission HILA5 is not secure against chosen-ciphertext attacks. Specifically, we demonstrate a key-recovery attack on HILA5 using an active attack on reused keys. The attack works around the error correction in HILA5. The attack applies to the HILA5 key-encapsulation mechanism (KEM), and also to the public-key encryption mechanism (PKE) obtained by NIST’s procedure for combining the KEM with authenticated encryption. This contradicts the most natural interpretation of the IND-CCA security claim for HILA5.
ePrint: https://eprint.iacr.org/2017/1214
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