It is possible that sequences with a high linear complexity have a very bad “linear complexity stability”, i.e., after changing a few bits of the original sequence, its linear complexity decreases or increases fast. But the proposed indexes are not sufficient to guarantee the security of stream ciphers. According to the literature, linear complexity of the key stream, randomness and correlation immune attacks are of great importance. Several indexes on the security of stream ciphers have been proposed for guaranteeing their strength. Stream ciphering devices seem to be one of the best alternatives in order to provide confidentiality to high-speed transmissions.
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