A New Approach to Improved PNB-based Attacks on Reduced-round ChaCha and Salsa↗ (원문, 새 창)

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ChaCha and Salsa are two ARX based stream ciphers which are widely used in data encryption including TLS v1.3 standard, VPN software etc. Exploiting Probabilistic Neutral Bits (PNB) is one of the most significant cryptanalysis strategies for reduced-round versions of these ciphers. The seminal work using PNB by Aumasson et al. (FSE 2008) claims that the PNB set mostly depends on the output bit difference occurring in the intermediate round. The subsequent works mainly relied on the differential