EChaCha20 maintains strong pseudorandomness at 16-bit and 32-bit levels with rapid diffusion after two quarter-rounds and no significant rotational collisions, based on KMP/BM analysis of one million keystreams.
Xchacha: extended-nonce chacha and aead xchacha20 poly1305.Internet Engineering Task Force, Internet-Draft draft-irtf-cfrg-xchacha-03, 2020
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Stringology-Based Cryptanalysis for EChaCha20 Stream Cipher
EChaCha20 maintains strong pseudorandomness at 16-bit and 32-bit levels with rapid diffusion after two quarter-rounds and no significant rotational collisions, based on KMP/BM analysis of one million keystreams.