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.
Testu01 and practrand: Tools for a randomness evaluation for famous multimedia ciphers.Multimedia Tools and Applications, 79(33):24075–24088
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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.