This study is a joint work with A. Doganaksoy and Ç. Çalık. We presented this study in SASC06 Stream Ciphers Revisited, Leuven Belgium, 2006,pdf Here is the abstract:
Synchronous stream ciphers produce long keystreams to be
XORed with plaintext. The output keystreams should be indistinguishable
from truly random sequences and should not leak any information
about the secret key and the internal state of the cipher. In this study,
we propose six new statistical tests to evaluate the randomness properties
of synchronous stream ciphers. We applied four of these tests to the
ciphers presented to ECRYPT and tabulated the results.
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